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 high frequency modulator was found in Motorola's 1990 Linear Databook. The current depends on the...
This circuit was found in an old Electronic Design used to apply digital signals to an analog...
Based on the frequency of the power grid, this circuit produces square signals for use in digital...