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.
The idea of this simple circuit is to use a tape recorder to key a transmitter in code emission....
November 10, 2015 - Mouser Electronics, Inc. is now offering the RN4677 dual-mode...
This circuit was found in na old latin american magazine. The circuit uses two germanium...