We found this cable tester in a Popular Electronics from the 90s. The circuit uses a connector according to the cable to be tested. Adaptations can be made for different types of cables.
This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
This countdown electromagnetic ring launcher was found in an Electronic Hobbyst Handbook from...
This circuit was found in an old Electronic Design used to apply digital signals to an analog...