Found in an American brochure from the 90s, this circuit shows how we can implement a 4-input AND gate with relays and switches.
If you are on an old PC that you use for experiments, control or other applications, this circuit is...
We found this circuit in an American publication from 1977. The circuit drives two LEDs according to...
In this circuit, the integrated amplifier used is uncommon today. The circuit is from an American...