This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and was found in an English publication. The sensor is semiconductor type.
Found on Popular Electronics from 1970, this circuit fires a xenon lamp producing a C1-dependent...
In the figure we have the circuit of a millivoltmeter with operational Amplifier using a TLC271...
This circuit uses an ignition coil to generate the high voltage that electrifies a fence. However, in...