The circuit shown in the figure can be designed with more modern operational amplifiers, as it is from 1994 documentation by National Semiconductor. The power supply must be symmetrical.
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...