Friday, July 4, 2014

Single Cell, White LED Torch Fits in a Matchbox




Picture of Circuit Diagram

This is the circuit from Chan's website ( which I modified and hived off two components. The modified circuit is seen here. The circuit is very robust and it worked with a wide variety of transistors; I tried BC547, 2N2222 and 2n3904. The coil I used had 25 turns each, of 26 gauge wire. Resistor R1 changes the intensity of the light. I tried values between 2KOhm to 220Ohm and I settled for 220Ohm. The light is quite bright at this value.

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