This small low current inverter operates at 20 kHz frequency. We found it in documentation from the 1980s. The integrated circuit is from that time.
This transistorized oscillator, a modification of the Colpitts oscillator, was found in the...
This circuit uses a CA3140, an operational amplifier with FETs in the input stages. Equivalent can be...
This signal injector and tracer (follower) was found in an old American documentation. The...