This circuit works as a useful field meter for radio amateurs. We found it in documentation from 1977.
This old receiver (1967) uses germanium transistors from the time and coupling transformers,...
This circuit was found in old documentation. D1 can be a diac. | Clique na imagem para ampliar...
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....