N° of component 

TTL Flasher 7400 (CB479)

Two LEDs are used in this TTL circuit. Frequency is given by C1 and C2. Power supply must be a 5 V source since the circuit is TTL. C1 and C2 can range from 10 to 100 100 µF. The other two gates of the 7400 can be used in another flasher like this.


TTL Flasher 7400
TTL Flasher 7400




Circuit Bench