Abstract: Adopt TTL Circuit has five advantages: More precise in retard; Visual and convenient; Setting; Less expenditure; Longer Life-span; Huge junction capacity; It is used to be control component in control circuit when uses AC 50HZ,voltage to 220V or DC 20V; It will get through or cut off the circuit according to the preordain time.
Key words: relay counter translator seven parts digital pip transformer
product experiment.