This simple LED torch is driven by a 2-transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150µH choke to protect the white ...

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 ...

There’s no doubting the brightness of the Cree LED in this Halfords aluminium torch, but the beam is less impressive. The centre is very bright, although away from the beam’s focus it’s quite dark.