With this circuit it is possible to control the intensity of a signal digitally. The circuit is from Radio Electronics from February 1981. The power supply must be 18 V.
Suggested by General Electric in 1965 documentation, this circuit controls the current at a load...
Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from...
We found this circuit in a Hands-on Electronics from 1985. The circuit is based on common...