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.
I found this circuit in a 2005 Wireless World and it is ideal for driving high power white LEDs....
The scratch is the noise of scratching or scrape that occurs when scratched vinyl records are...
June 2017 - The new touch switches C & K KXT series can now be obtained from Mouser Electronics. These...