This circuit for audio applications was found in an English magazine from the 80's. The circuit has a pass band below 3 kHz making it ideal for telecom applications.
The frequency of this clock oscillator is given by the crystal. The trimmer sets the ideal...
We found this circuit in a Radio Electronics Experimenter from 1990. The circuit uses a common...
This circuit simulates a multi-position switch using programming buttons. The circuit is from an...