This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid of an electric typewriter of the time.
Found on 80's Popular Electronics, this circuit uses an uncommon integrated today. Programming is done...
Found in a Philips' 1968 documentation, this circuit is slightly different from the previous one. The...
This circuit from an American documentation from the 70s, indicates a photodiode to generate...