This circuit for light modulated in frequency (FM) operating at 50 kHz was found in a 90’s Electronics Now. The circuit has an active filter. Modern equivalent transistors can be used.
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...