https://newjune.uoregon.edu/mediawiki/index.php?action=history&feed=atom&title=Developing_the_BoardDeveloping the Board - Revision history2026-05-09T17:01:02ZRevision history for this page on the wikiMediaWiki 1.42.3https://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3487&oldid=prevAplstudent at 19:43, 9 March 20192019-03-09T19:43:38Z<p></p>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>To develop the board, you will need a room-temperature bath of NaOH and latex gloves (the NaOH is somewhat caustic and shouldn't make contact with your skin). The NaOH comes in granule form and must be mixed with room-temperature water (do not use hot water). Every, 10 grams NaOH must be mixed with 1 liter of water. Using an electronic scale, measure <del style="font-weight: bold; text-decoration: none;">2.</del>5 grams of NaOH, and using a graduated cylinder measure <del style="font-weight: bold; text-decoration: none;">250 </del>milliliters of water, then pour the contents into a plastic tray (the solution will react with metal so do not use a metal tray). Mix the NaOH/water solution thoroughly to ensure that you board develops evenly. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>To develop the board, you will need a room-temperature bath of NaOH and latex gloves (the NaOH is somewhat caustic and shouldn't make contact with your skin). The NaOH comes in granule form and must be mixed with room-temperature water (do not use hot water). Every, 10 grams NaOH must be mixed with 1 liter of water. Using an electronic scale, measure 5 grams of NaOH, and using a graduated cylinder measure <ins style="font-weight: bold; text-decoration: none;">500 </ins>milliliters of water, then pour the contents into a plastic tray (the solution will react with metal so do not use a metal tray). Mix the NaOH/water solution thoroughly to ensure that you board develops evenly. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Once the solution is well mixed, use a gloved hand to gently submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care). The photoresist on the board should begin to "smoke" off immediately and you should keep the board moving to ensure fresh NaOH covers the board. The pattern of your artwork should become visible as the board develops. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Once the solution is well mixed, use a gloved hand to gently submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care). The photoresist on the board should begin to "smoke" off immediately and you should keep the board moving to ensure fresh NaOH covers the board. The pattern of your artwork should become visible as the board develops. </div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process<ins style="font-weight: bold; text-decoration: none;">. This doesn't always work but it is better than leaving the copper completely exposed</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3485&oldid=prevAplstudent at 19:35, 9 March 20192019-03-09T19:35:14Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</ins></div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3484&oldid=prevAplstudent at 19:34, 9 March 20192019-03-09T19:34:01Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer <del style="font-weight: bold; text-decoration: none;">below</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer <ins style="font-weight: bold; text-decoration: none;">during the etching process</ins>.</div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3483&oldid=prevAplstudent at 01:07, 8 March 20192019-03-08T01:07:26Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer below.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer below.</div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3481&oldid=prevAplstudent at 01:06, 8 March 20192019-03-08T01:06:18Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:]]</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer below.</ins></div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3480&oldid=prevAplstudent at 01:02, 8 March 20192019-03-08T01:02:26Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 01:02, 8 March 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8">Line 8:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[File:]]</ins></div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3446&oldid=prevAplstudent at 01:09, 2 March 20192019-03-02T01:09:20Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 01:09, 2 March 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3">Line 3:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Once the solution is well mixed, use a gloved hand to gently submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care). The photoresist on the board should begin to "smoke" off immediately and you should keep the board moving to ensure fresh NaOH covers the board. The pattern of your artwork should become visible as the board develops. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Once the solution is well mixed, use a gloved hand to gently submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care). The photoresist on the board should begin to "smoke" off immediately and you should keep the board moving to ensure fresh NaOH covers the board. The pattern of your artwork should become visible as the board develops. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Check your board every 30 seconds to see the progress. When the copper layer is exposed and shiny you are almost done. Once it looks as if all the photoresist has been removed continue moving the board in the solution for 30 more seconds. Then, remove the board and run it under cold water and be sure to avoid dripping developer during the transfer process.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Check your board every 30 seconds to see the progress<ins style="font-weight: bold; text-decoration: none;">; 3 minutes in the NaOH bath was found to be effective</ins>. When the copper layer is exposed and shiny you are almost done. Once it looks as if all the photoresist has been removed continue moving the board in the solution for 30 more seconds. Then, remove the board and run it under cold water and be sure to avoid dripping developer during the transfer process.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3431&oldid=prevAplstudent at 20:01, 20 February 20192019-02-20T20:01:25Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:01, 20 February 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l7">Line 7:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based <del style="font-weight: bold; text-decoration: none;">of </del>Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based <ins style="font-weight: bold; text-decoration: none;">on </ins>Professor Steck's tutorial in his book "Analog and Digital Electronics")</div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3430&oldid=prevAplstudent at 20:01, 20 February 20192019-02-20T20:01:11Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:01, 20 February 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l7">Line 7:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based of Professor Steck's book "Analog and Digital Electronics")</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>(Some of this tutorial is based of Professor Steck's <ins style="font-weight: bold; text-decoration: none;">tutorial in his </ins>book "Analog and Digital Electronics")</div></td></tr>
</table>Aplstudenthttps://newjune.uoregon.edu/mediawiki/index.php?title=Developing_the_Board&diff=3429&oldid=prevAplstudent at 20:00, 20 February 20192019-02-20T20:00:36Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:00, 20 February 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Prepare </del>the board <del style="font-weight: bold; text-decoration: none;">resist developer solution using 10g </del>of <del style="font-weight: bold; text-decoration: none;">pure </del>NaOH <del style="font-weight: bold; text-decoration: none;">granules </del>(<del style="font-weight: bold; text-decoration: none;">meter using analytic balance</del>) <del style="font-weight: bold; text-decoration: none;">per </del>liter of water (<del style="font-weight: bold; text-decoration: none;">about 250ml in </del>the <del style="font-weight: bold; text-decoration: none;">small </del>tray <del style="font-weight: bold; text-decoration: none;">more than suffices</del>). <del style="font-weight: bold; text-decoration: none;">Room-ish temperature is sufficient, hot is bad (accelerates development and punchthrough, potentially just stripping all resist from </del>the board<del style="font-weight: bold; text-decoration: none;">)</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">To develop </ins>the board<ins style="font-weight: bold; text-decoration: none;">, you will need a room-temperature bath </ins>of NaOH <ins style="font-weight: bold; text-decoration: none;">and latex gloves </ins>(<ins style="font-weight: bold; text-decoration: none;">the NaOH is somewhat caustic and shouldn't make contact with your skin). The NaOH comes in granule form and must be mixed with room-temperature water (do not use hot water</ins>)<ins style="font-weight: bold; text-decoration: none;">. Every, 10 grams NaOH must be mixed with 1 </ins>liter of water<ins style="font-weight: bold; text-decoration: none;">. Using an electronic scale, measure 2.5 grams of NaOH, and using a graduated cylinder measure 250 milliliters of water, then pour the contents into a plastic tray </ins>(the <ins style="font-weight: bold; text-decoration: none;">solution will react with metal so do not use a metal </ins>tray). <ins style="font-weight: bold; text-decoration: none;">Mix </ins>the <ins style="font-weight: bold; text-decoration: none;">NaOH/water solution thoroughly to ensure that you </ins>board <ins style="font-weight: bold; text-decoration: none;">develops evenly</ins>. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Holding </del>the <del style="font-weight: bold; text-decoration: none;">board in </del>a gloved hand<del style="font-weight: bold; text-decoration: none;">, immerse and </del>gently <del style="font-weight: bold; text-decoration: none;">swish/agitate it</del>. <del style="font-weight: bold; text-decoration: none;">You </del>should <del style="font-weight: bold; text-decoration: none;">promptly see green streaming/boiling/clouding </del>off the board <del style="font-weight: bold; text-decoration: none;">and </del>the <del style="font-weight: bold; text-decoration: none;">emergence </del>of <del style="font-weight: bold; text-decoration: none;">the </del>artwork <del style="font-weight: bold; text-decoration: none;">pattern. Inspect closely every 30 seconds or so - </del>the <del style="font-weight: bold; text-decoration: none;">exposed copper to be etched should be bright and shiny. Any hint of gumminess means that there is a thin film of resist still clinging to it</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Once </ins>the <ins style="font-weight: bold; text-decoration: none;">solution is well mixed, use </ins>a gloved hand <ins style="font-weight: bold; text-decoration: none;">to </ins>gently <ins style="font-weight: bold; text-decoration: none;">submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care)</ins>. <ins style="font-weight: bold; text-decoration: none;">The photoresist on the board </ins>should <ins style="font-weight: bold; text-decoration: none;">begin to "smoke" </ins>off <ins style="font-weight: bold; text-decoration: none;">immediately and you should keep </ins>the board <ins style="font-weight: bold; text-decoration: none;">moving to ensure fresh NaOH covers </ins>the <ins style="font-weight: bold; text-decoration: none;">board. The pattern </ins>of <ins style="font-weight: bold; text-decoration: none;">your </ins>artwork <ins style="font-weight: bold; text-decoration: none;">should become visible as </ins>the <ins style="font-weight: bold; text-decoration: none;">board develops</ins>. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">If </del>the <del style="font-weight: bold; text-decoration: none;">developer </del>is <del style="font-weight: bold; text-decoration: none;">fresh</del>, <del style="font-weight: bold; text-decoration: none;">this gumminess means that </del>the board <del style="font-weight: bold; text-decoration: none;">was underexposed. There's nothing to lose at this point by keeping going in development to see if </del>it <del style="font-weight: bold; text-decoration: none;">will clear. It will not </del>be <del style="font-weight: bold; text-decoration: none;">too very long before the caustic will begin </del>to <del style="font-weight: bold; text-decoration: none;">strip </del>the <del style="font-weight: bold; text-decoration: none;">unexposed resist as well, however</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Check your board every 30 seconds to see </ins>the <ins style="font-weight: bold; text-decoration: none;">progress. When the copper layer </ins>is <ins style="font-weight: bold; text-decoration: none;">exposed and shiny you are almost done. Once it looks as if all the photoresist has been removed continue moving the board in the solution for 30 more seconds. Then</ins>, <ins style="font-weight: bold; text-decoration: none;">remove </ins>the board <ins style="font-weight: bold; text-decoration: none;">and run </ins>it <ins style="font-weight: bold; text-decoration: none;">under cold water and </ins>be <ins style="font-weight: bold; text-decoration: none;">sure </ins>to <ins style="font-weight: bold; text-decoration: none;">avoid dripping developer during </ins>the <ins style="font-weight: bold; text-decoration: none;">transfer process</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Once done</del>, <del style="font-weight: bold; text-decoration: none;">rinse both sides under fast running cold water to get </del>the <del style="font-weight: bold; text-decoration: none;">caustic off. Gently DAB dry </del>using a paper <del style="font-weight: bold; text-decoration: none;">towl</del>. DO NOT rub<del style="font-weight: bold; text-decoration: none;">: The </del>resist isn't a delicate flower but it's not that tough either.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">To dry the board</ins>, <ins style="font-weight: bold; text-decoration: none;">gently DAB </ins>the <ins style="font-weight: bold; text-decoration: none;">surface </ins>using a paper <ins style="font-weight: bold; text-decoration: none;">towel</ins>. DO NOT rub <ins style="font-weight: bold; text-decoration: none;">the board; the </ins>resist isn't a delicate flower but it's not that tough either.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Pretty!</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">(Some of this tutorial is based of Professor Steck's book "Analog and Digital Electronics")</ins></div></td></tr>
</table>Aplstudent