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.
This inverter was found in an old European documentation, but components are still current. Only...
This circuit was obtained from an old American publication. The uA702 is a differential amplifier and...
This circuit was found in a 1967 Electronics World. SCRs are according the controller load,...