Output monitor (CB22210E)

This circuit was found in old documentation. Transistors can be BC548. The LEDs are the same.

11-meter range receiver (CB23825E)
This remote-control circuit was found in Radio Electronics magazine from June 1962. It drives a...
Operational Bistable (CB19359E)
In the figure we have a bistable multivibrator using an operational one. The circuit is from old...
Oscillator up to 100 kHz (2 transistors) (CB13136E)
The circuit shown in the figure uses general purpose NPN transistors and can be used to generate...