This circuit with a differential pair was found in the August 1974 Radio Electronics magazine. The frequency is determined by L1 and the variable capacitor.
We found this circuit in a Radio Electronics from October 1963. The circuit uses an output...
This circuit was found in a 70s documentation. The transistor is from that time. L1 has 4 turns of...
Raystor is a component of the 1960s Raytheon. It consists of a light coupler that allows you to...