Found in a 1965 Electronic Design, this circuit divides the frequency of a 50 MHz signal by 2. The circuit makes use of period components and the signal power can be between 7 and 125 W.
This circuit was found in an American publication from the 50's. The transistors are made of...
The circuit shown is an amplifier for medium impedance headphones including bass and treble...
This circuit for an optical audio link using LED or LASER was found in a 90s QST magazine. The circuit...