Found in a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The transducer is the type that fits on the finger to monitor the transparency and thus the beats.
This circuit works like a solid-state contactor. We find it in General Electric documentation from...
This circuit was found in an American 80's circuit board. The components used are current except the...
This circuit was found in a 1980s Signetics documentation. The integrated circuit is from the era. The...