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.
Found in old documentation for radio amateurs, this circuit is intended to excite a MOSFET on the...
This silencer or squelch preamp circuit was found in a documentation for radio amateurs. It...
This Siliconix circuit was found in a 1980s documentation. The coil consists of 18 turns of 22...