This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and was found in an English publication. The sensor is semiconductor type.
August 2017 - Mouser Electronics is now offering the Diodes Incorporated AH1389 Hall Single-pole...
The component used in this circuit is not very common today as the circuit is from the 80's. It...
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...