This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of analog televisions of the time. The integrated circuit used is uncommon today.
This filter can be implemented with almost any operational. The power suppply must be symmetrical. ...
This traditional circuit of old documentation uses a 0-1 mA milliammeter and has several scales....
This simple 2-transistor radio is from Radio Electronics in October 1952. The circuit outputs a...