This is a typical circuit for an old microwave oven. We took it from an August 1973 Radio Electronics magazine, from an article that taught how to make repairs.
This small amplifier with a low impedance microphone that can be used for hearing aid was found in a...
We found this circuit in an old American documentation. The table gives the values of the...
Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified....