This circuit of 1965 documentation makes use of a tunnel diode to retard a pulse without distortion. The components are from the era.
This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The...
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
This circuit shows how to implement a TTL compatible oscillator using a transistor. The circuit is...