This circuit was found in the 1992 Radio Electronics Handbook. It is used to test VCR recording heads. It can also be used for other purposes.
This circuit with optical couplers was found in General Electric documentation from the 80's. The...
A non-sinusoidal 120 V voltage can be obtained with this circuit found in the December 1992 Radio...
This transistor tester circuit has the advantage of using a constant current source in the tests....