This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...
This two-transistor MW radio was found in a publication from 1958. It uses one of the oldest type...
This simple circuit was suggested by the Electronics Handbook Volume XIII 1993. LED D1 emits light for...