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.
When S1 is closed, the L1 lamp turns on and the L2 lamp turns off. The circuit is powered...
This is yet another version of the light-controlled oscillator that can be found on this website. This...
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single-step motor...