This medium power circuit is from an English publication from 1989. The integrated circuits are of types that are still obtainable. The power supply must source at least 2A.
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We found this circuit in a 1986 documentation. It causes 40 LEDs to flash sequentially. The big...
Found in a National Semiconductor manual from the 90's, this circuit uses components of the time,...
Simple timers can be designed using inverters or any other gate that can be connected as inverter. Figure...