Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I am trying to build a circuit that uses a phototransistor to turn on a led when it gets dark. Using a modified computer Power supply I get 12v DC neg/pos, 5v DC neg/pos and 3.5v DC neg/pos. Led’s are 5mm 3w green super intensity 15000mcd, I have 1/4w metal film resistors 100ohm for DC 5w &...
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