This circuit is used to turn on the headlights when it gets dark. The circuit is from an Electronics Now magazine from October 1998. The power transistor must be equipped with a heatsink.
This simple circuit uses a 200 uA microammeter of the type found as VU, being able to measure...
Originally designed to analyze the shape of light pulses from a flash for photographic...
Suggested by a Popular Electronics, this small amplifier that has a detector to follow RF...