Found in a 1969 British publication, this circuit uses a regenerative switch with two transistors to produce pulses that depend on C1. The relay must be in accordance with the supply voltage.
This circuit is from the July 1973 Radio Electronics magazine. The circuit is based on the XR-205,...
This Hartley oscillator uses an audio output transformer that can be obtained from small, unused...
This circuit is intended for carrying out experiments with solar cells. The circuit is from a 1991...