Based on CMOS logic this short-circuit locator circuit uses the ear's ability to detect small changes in pitch, which are caused by variations in millivolts in a track under analysis.
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
This circuit was found in an old American magazine and could make use of more modern components...
This circuit is from the Philips integrated circuits manual of 1990. It is intended for magnetic...