LED Torch Uses Blocking Oscillator

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 150┬ÁH choke to protect the white LED from over-drive. With a 9V zener diode in place of the white LED, it could also provide a 9V supply provided the current drain is modest.


Circuit diagram

Author: Peter Goodwin
Copyright: Silicon Chip Electronics

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