Audio Cable Tester (CB3827E)

This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered by two common batteries.

Light beam switch (CB21413E)
This circuit was obtained from a 1965 General Electric SCR manual. The components are from the...
Common font FET stage (CB4686E)
This is the typical circuit of an FET amplifier stage in the common source configuration. The circuit is...
4 W Amplifier with Something More (CB16094E)
The TDA1013 is an audio amplifier that can provide powers of up to 4 watts, and which has...