This circuit is from a Radio Electronics magazine from July 1979. It uses the well-known IC 7107, a liquid crystal exciter that became popular in circuits of this type at the time.
This interesting oscillator was obtained from an old documentation. In principle any 106 series SCR...
This filter, with a cut-off frequency of approximately 1 kHz, has a high Q and employs two...
This circuit is from a Radio Electronics from February 1964. The circuit uses period transistors and is...