We found this circuit in the April 1992 issue of Radio Electronics magazine. The circuit uses an operating system that requires a symmetrical power supply.
This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics...
The frequency in this circuit is adjusted by P1 and given by C1. Short pulses, as the ones...
This Hartley telegraphy oscillator operates with the transmitter signal generating a tone in a...