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.
This circuit was obtained from an English magazine from 1979, but can be easily assembled...
We found this circuit in a 1991 European documentation. The circuit shows how to use the LM3900...
Found in a General Electric documentation from the 1980s, this circuit makes use of a FET...