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 is a possible setting for a Colpitts oscillator operating in the audio track. The shunt coil...
This circuit has its gain controlled by voltage. The circuit, which uses discrete components, was...
The purpose of this circuit is to provide a few watts of power to a heavy speaker with good sound...