Found in the April 1995 issue of Electronics Now, this circuit operates at a lower frequency than conventional ones. The output current is very low.
Vox or sonic switch is a relay activated by the voice or any sound picked up by the microphone. This...
Found in a Popular Electronics from the 90s, this circuit can be adapted to use LEDs. The power...
This basic circuit is from 1984 documentation. This circuit can be used as an efficient burglar alarm...