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.
May 6, 2015 - Mouser Electronics, Inc., the global authorized distributor with the newest...
This circuit is from a National Semiconductor manual, appearing elsewhere on this site. The...
August 2016 - It can be obtained from Mouser Electronics the new operational amplifiers series...