This circuit cuts the audio for a few seconds between words, which allows ads to be detected, since this does not occur in music. The circuit is a from Radio Electronics Experimenter from 1989.
This circuit with only one transistor was found in Japanese documentation from the 1960s. The...
This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be...
This interface shield circuit is from the 1983 Intersil Databook. The components used are uncommon...