For signals up to about 500 kHz modulated in amplitude and transmitted by the power network, the figure shows the receiver. The circuit is from a Radio Electronics from February 1989.
This 100 kHz crystal controlled oscillator was found in an American 1980s documentation. The...
Only two transistors are used in this preamp for low-sensitive transducers, such as guitar and...
Found in Popular Electronics this circuit uses current components to control a pump in order to...