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How to make a printed circuit board (PCB) using the UV light LED method.
I changed the power supply arrangement so it runs directly off the mains (at the moment an isolation transformer whilst I test things). I discovered that the mains voltage can change by as much as +10% and -6% in the UK, so I found this voltage limiting circuit to keep the DC down to 300V. The 3 4k7 resistors drop 84V each, and the 3 LM317's provide 18mA per series chain of 66 LED's. (see pdf)I used cheap prototype board off eBay, but the 198 LED's don't quite fit, so there are a couple in odd places!I have mostly made a box 11" deep with the board this is mounted on forming the base. It's not a very good box - I need to find one like yours!Thanks for a great instructable :)
i want to buy hole setup . how i can get it.
I'm awaiting parts to build this! But mine will be a constant current version - schematic attached! It assumes a 3.5v drop for each LED and nominal supply voltage of 240VAC.
1. which chemical should i have to use for photoresistive coating2. I am using CFL(28 w) lamp to transfer my circuit through ohp sheets, please guide me the wattage required for cfl
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