Clocked Flip Flop 7400 (CB22413E)

This TTL circuit uses 5 NAND gates of 7400 integrated circuits. It must be powered with 5 V.

Light Sensitive Relay with 741 (CB25478E)
This circuit for 12 V relays was found in the July 1992 Radio Electronics magazine. The circuit is set...
555 Tester (CB20887E)
To fit the integrated circuit under test, we used an 8-pin DIL socket. Observe the fitting...
Bistable (CB22280E)
This flip-flop or bistable was found in a publication about transistors from the 60's. The circuit...