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Step 25Testing
You may want to check everything is OK by hooking up a bench PSU and turning the voltage up slowly. You may also want to check the voltage of you PSU. When you're confident everything is OK plug it in and switch it on.
Safety note! Do not stare directly into the UV LEDs. UV light is harmful to your eyes. It's also a good idea to get hold of some laser goggles, these should block all the light below 532nm. To get an idea of the amount of time you should expose your PCBs for you can do an exposure test. Coat a piece of scrap metal with Photo resist on one-side and mark minutes on the other. Then with a piece of card mask of the metal expose for 1 minute then move the card to the next, mark expose for another minute and keep going until you reach the end. Remember start at the 10-minute mark and work down.
Safety note! Do not stare directly into the UV LEDs. UV light is harmful to your eyes. It's also a good idea to get hold of some laser goggles, these should block all the light below 532nm. To get an idea of the amount of time you should expose your PCBs for you can do an exposure test. Coat a piece of scrap metal with Photo resist on one-side and mark minutes on the other. Then with a piece of card mask of the metal expose for 1 minute then move the card to the next, mark expose for another minute and keep going until you reach the end. Remember start at the 10-minute mark and work down.
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