The circuit shown is from Motorola's 1990 Linear Databook. Components are not currently common. An equivalent can be used for the transistor.
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...