This circuit was found in a PE Hobbyst Handbook of 1989. It uses a black light fluorescent of the time. Small fluorescent black light from 1 to 4 W can be used.
This circuit can be used as a buzzer from 3 different locations, allowing you to identify where it went...
This amplifier provides 20 W of power on each channel, containing separate filters to power a...
This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of...