This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of Electronics Now magazine. The integrated circuit may be an LM339 or another comparator.
This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V...
The circuit in the figure produces a perfectly rectangular waveform signal. For a 1 nF C1...
We found this configuration in a Radio Electronics from 1989. The circuit can be designed with...