This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends audio signals by modulating a low-frequency carrier through the power grid.
This circuit is from an Electronics World of 1964. The circuit can be made with modern...
June 2017 - Kemet T521's new high voltage capacitors with capacitances up to 330 uF and voltages...
This circuit was found in a 1999 English magazine, but can be easily assembled with BC548...