This circuit was found in an Elektor from the 90s. It makes use of digital CMOS integrated devices common today. The signal is controlled automatically sequentially.
This circuit was obtained from an English magazine from 1976. The circuit monitors a car lamp,...
This circuit was obtained from a 1966 documentation. The transistors are of the time. The circuit...
This TTL circuit for PC was found in an English documentation from 1992. The integrated circuit used...