This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital signals. The circuit can be used as a shield. FET can be a modern equivalent.
This circuit appears on the site in several variations depending on the source. This is from a...
This counter performs the same function as the 4020, but includes an internal oscillator. The...
Found in a 1968 Electronics World, this circuit uses operational amplifiers from that time. |...