This circuit with germanium transistors is from 1960 and was found in Mullard's transistor application manual from 1960. The circuit can be adapted to use more modern transistors.
This is the normal configuration for an oscillator with a tunnel diode. The crystal determines the frequency...
This receiver uses few components, having been found in a Japanese magazine in 1967. The coil has...
This circuit uses a 741 operational amplifier that must be powered by a symmetrical source of 6 to...