This circuit is from a 1970 General Electric documentation. It can be found with variations on this website. The components used are common today.
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single-step motor...
Integrated circuits 8038 and 8063 are not common today. This circuit, found in the 1983 Intersil...
This transmitter uses a 741 operational amplifier in modulation. The microphone can be any type...