TRANSISTOR DRIVER CIRCUIT

摘要

TRANSISTOR DRIVER CIRCUIT This specification discloses transistor circuitry suitable for use as a switch or as a floating current driver to control the concurrent operation of a pair of utilization devices. The circuitry comprises an NPN and a PNP output transistor which are substantially simultaneously switchable to ON and OFF states by a bias control means. The output transistors each have a collector connectable to a utilization device and a voltage of a prescribed polarity. Emitters of the output transistors are connected together in a floating voltage arrangement via a resistor. The bias control means comprises a pair of NPN transistors and a diode connected PNP transistor illustratively for switching the NPN output transistor and then the PNP output transistor to ON and OFF states. A logic gate switches a constant current to the bias control transistors for controlling the switching operations.