This circuit was found in an American 1980s documentation. The transistorized step is the receiver's last IF and the diode is the receiver's existing detector.
May 2017 - This new Ricoh 4 A current device is now available from Mouser Electronics. The device...
The frequency of this oscillator depends on the amount of light incident on the LDR. The circuit,...
This circuit was found in a 1973s Japanese publication. The power transistors used are of the era...