We found this circuit in a 1977 Radio Shack documentation. The circuit should be powered, for safety, with 5 V, because it is TTL. We recommend connecting a diode in series with B1 if the original 6 V is used.
We found this circuit in a 1977 Radio Shack documentation. The circuit should be powered, for safety, with 5 V, because it is TTL. We recommend connecting a diode in series with B1 if the original 6 V is used.
