This VCA was found in the July 1988 issue of Radio Electronics magazine. It uses an OTA op amp and has its gain adjusted by the voltage at the gain input.
We found this transistorized AM receiver of the regenerative type of excellent quality in a...
This continuity tester for low resistances was found in an English magazine from 1978. The circuit...
Found in American documentation from the 1980s, this circuit rejects strong MW stations that may...