pcbetching
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pcbetching [2022-01-15 14:52] – jtdburton | pcbetching [2022-01-16 11:41] – jtdburton | ||
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====== PCB Etching ====== | ====== PCB Etching ====== | ||
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- | This is currently a rough guide to the equipment we have for DIY PCB etching and how to use it. | ||
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===== Equipment ==== | ===== Equipment ==== | ||
* [[http:// | * [[http:// | ||
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Sodium hydroxide (" | Sodium hydroxide (" | ||
- | Ferric chloride (etchant): Wear gloves. Wear eye protection. Touch it and die. Can be reused for months or even years, so you shouldn' | + | Ferric chloride (etchant): Wear gloves. Wear eye protection. Touch it and die. Can be reused for months or even years, so you shouldn' |
===== Design/file prep ===== | ===== Design/file prep ===== | ||
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===== Exposure ==== | ===== Exposure ==== | ||
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+ | Grab the laminator, some sellotape, and a pair of scissors from G1 before you start with this section. | ||
Currently (as of January 2022) the lab has NEGATIVE photoresist, | Currently (as of January 2022) the lab has NEGATIVE photoresist, | ||
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Cut a piece slightly larger than your board from the roll of photoresist film kept wrapped in a black bag in the cabinet in G14. PUT THE ROLL BACK IN THE BAG - it's UV sensitive. | Cut a piece slightly larger than your board from the roll of photoresist film kept wrapped in a black bag in the cabinet in G14. PUT THE ROLL BACK IN THE BAG - it's UV sensitive. | ||
- | Peel off the backing (this is incredibly annoying to do - a couple of pieces of sellotape on either side of the corner can help peel the layers apart) and apply the blue film to your board. Try to squeeze any bubbles or wrinkles out to the sides, then run the board through the laminator | + | Peel off the backing (this is incredibly annoying to do - a couple of pieces of sellotape on either side of the corner can help peel the layers apart) and apply the blue film to your board. Try to squeeze any bubbles or wrinkles out to the sides, then run the board through the laminator. The laminator should be set on the largest thickness setting (2x125MIC), and it helps to run it through two or three times to improve the bond. |
Put your mask and film-coated board together in a sort of deadly yet exciting chemical sandwich. Align as best you can using the mounting holes you hopefully punched out earlier, and add some sellotape to hold everything together. | Put your mask and film-coated board together in a sort of deadly yet exciting chemical sandwich. Align as best you can using the mounting holes you hopefully punched out earlier, and add some sellotape to hold everything together. |
pcbetching.txt · Last modified: 2022-07-22 22:12 by MirZa