This is a circuit that allows remote activation of a power supply. The circuit was used with a timer of the time. It appeared in the November 1973 issue of Radio Electronics magazine.
We found this circuit in an American publication from the 90s. The power must be 2 V more than the...
Found in old American documentation, this circuit makes use of operational amplifiers from the 70s...
This linear LED scale circuit was found in the February 1992 issue of Radio Electronics magazine. Note...