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.
This 80's circuit uses an integrated amplifier of the era, but nothing prevents it from being...
This circuit produces horizontal lines or bars in a analog TV tuned between channels 2 and 5. L1...
This circuit can be used to add a delay to a logic signal as shown by the input and output...