This two-digit (up to 99) circuit divides a signal by values programmed by the BCD switches. The circuit comes from a Radio Electronics from February 1989.
With the configuration shown in the figure, we have the relay being activated when the microphone picks...
This circuit dates to 1999, when most vehicles did not yet have electronic ignition and used...
This circuit is from a 1968 documentation. It generates a non-symmetrical signal with the waveform...