Monostable 4098 (CIR25124E)

This CMOS circuit is re-triggerable. It was found in the April 1988 issue of Radio Electronics magazine;

Power Grid Distortion Meter (CB23629E)
This interesting circuit measures the distortion of the sinusoidal voltage of the power grid. We...
Voltmeter (CB19740E)
The operational amplifier used in this old application is not common today, but more modern...
50 KHz IF (CB22243E)
Used in 1950s CW receivers, this type of circuit used germanium transistors. The circuit has...