This audio configuration of televisions from the 1960s was found in a Mullard transistor reference manual. Transformers are the critical components.
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...