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 regulated by zener and provides a voltage of 9 V. The circuit is from a Radio...
In the circuit shown in the figure when we press S1, capacitor C1 charges slowly, and with that it...
This audio oscillator is from a 1957 Raytheon publication. The tone generated depends on C2 and C2...