Simple transistor drive for signal coupling transistor switch - consists of transistor pair with each transistor of opposite conductivity type (OE 15.10.77)

摘要

A simple transistor drive or control circuit for a signal coupling transistor switch is used. It consists of a PNP NPN transistor pair which allows rapid switching and consists basically of a single transistor amplifier. A PNP-NPN transistor pair (T2, T2') is connected between a signal input (E) and output (A) via capacitances (CE, CA), and the bases of the transistors are connected to the collector and base of the control transistor (T1). The biassing is dependent on an array of transistors, while an input switching waveform is applied to the base of the control transistor via a further resistance (R1).