The led torch circuit is nothing but an astable multi vibrator (AMV) wired around the ubiquitous timer chip LM555C (IC1). Components R1,R2 and C2 sets the oscillator frequency. This circuit has been ...

This Design Idea describes a single white-LED torch, which can be housed in an empty glue-stick tube and has a long rechargeable-battery life. The circuit is constructed with just a few commonly ...