Control circuit

Claim 1

A CONTROL CIRCUIT COMPRISING MEANS INCLUDING A PAIR OF RECTIFYING TRANSISTORS EACH HAVING A BASE ELECTRODE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE FOR FULL WAVE RECTIFICATION OF AN ALTERNATING-CURRENT WAVE AND PROVIDING AS AN OUTPUT A SERIES OF UNIPOLAR SYMMETRICAL PULSES, A CONTROL NETWORK COUPLED TO SAID BASE ELECTRODES, SAID NETWORK INCLUDING A POTENTIOMETER AND FIRST AND SECOND CONTROL TRANSISTORS, SAID CONTROL TRANSISTORS BEING CONNECTED TO HAVE THEIR PRINCIPAL CONDUCTION PATHS BOTH IN SERIES WITH EACH OTHER AND IN SERIES WITH SAID BASE ELECTRODES, AND MEANS INCLUDING SAID POTENTIOMETER FOR BIASING SAID CONTROL TRANSISTORS, SAID FIRST CONTROL TRANSISTOR BEING DISPOSED SO AS TO REGULATE THE CUTOFF POINT OF SAID PAIR OF RECTIFYING TRANSISTORS AND SAID CONTROL TRANSISTOR BEING DISPOSED SO AS TO REGULATE THE AMPLITUDE OF SAID SYMMETRICAL PULSES, SAID FIRST AND SECOND CONTROL TRANSISTORS AND SAID POTENTIOMETER BEING FURTHER DISPOSED SUCH THAT THE REGULATION OF THE CUTOFF POINT OF SAID PAIR OF RECTIFYING TRANSISTORS AND THE AMPLITUDE OF SAID SYMMETRICAL PULSES PROVIDED BY SAID CONTROL TRANSISTORS OCCUR SIMULTANEOUSLY IN ACCORDANCE WITH THE SETTING OF SAID POTENTIOMETER.