This latching light alarm was found in the 1995 Encyclopedia of Electronic Circuits Volume 5. The circuit is powered with 12 V to provide a signal to a power stage.
This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
This simple oscillator with a photocell was found in a Radio Electronics from January 1965. The...
Nothing more useful on the bench than a variable voltage source. This is the source we found in...