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.
Found in documentation from Analog Devices from the 90s, this circuit is intended for interfacing with...
This is another quick adder that we found in an Electronic Design from the 80s. It also applies to...
This sequential relay actuation system circuit for traffic lights was found in Electronics Now...