This basic TTL watch and minute clock circuit was found in European documentation from the 1970s. The power supply is not included and is given in CB19635E. The circuit uses common anode displays.
We found this circuit in a French documentation from the 80's. The components used are still...
This circuit, which may have appeared elsewhere on this site, is from the integrated...
Two operational amplifiers are used in this source obtained in an American documentation...