This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
Using the CA3140 integrated circuit, this switch was found in the June 1986 Radio Electronics...
This circuit was found in the 1989 Radio Electronics Experimenter edition. The circuit has the...
This circuit cuts the audio for a few seconds between words, which allows ads to be detected,...