Placed near a common receiver, this oscillator is intended to generate a beating signal to receive RTTY or SSB communications. The circuit is from old telecommunications documentation.
The combination of diodes determines which of the LEDs will light when one of the switches is...
This circuit was found in an article in Radio Electronics magazine. The issue is from July 1992...
This circuit was obtained in a 1978 English magazine. This adjustable stabilized power source...