This is an amplifier circuit intended for modulating transmitters. The 5-tube circuit is from an American manual from 1947. The power supply uses a transformer.
Found in a 1968 Electronic Design, this circuit makes use of an unusual ultrasonic delay line...
This circuit shows how to use a 3-terminal voltage regulator as a low frequency oscillator by...
This circuit has some differences from the conventional types of control in which the delay in the...