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 stabilized power supply was found in the 1974 Ferranti transistor manual. The power...
This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio...
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...