We found this precision circuit in a manual from the 80's. The operational amplifier is of a common type at the time, and equivalents can be tested. Transistors are general purpose types.
This circuit was found in the January 1994 Electronics Now magazine. The transistors are general...
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...
This circuit is suitable for testing motor starting capacitors. Capacitors from 2 to 8 uF are...