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.
Alongside the diagram of this control, which we find in a 1980s documentation are the component...
This circuit uses a common-cathode 7-segment display powered from a decoder and a 0-9 counter. The...
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...