This commercial clock circuit was found in the August 1976 issue of Radio Electronics magazine. The circuit uses a period module and includes power from a special transformer.
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...