In this circuit the voltage between base and emitter is just that of a single transistor in contrast to that of a conventional darlington pair circuit. How a darlington pair transistor works a darlington pair is two transistors that act as a single transistor but with a much higher current gain. A Darlington Pair Transistor Based Operational Amplifier Schematic Diagram Of The Conventional Darlington Pair Darlington Pairs Transistors 101 Adafruit Learning System Although the darlington pair has some limitations it is nevertheless used in many areas especially where high frequency response in not needed. Darlington pair transistor circuit . Q 1 the left hand transistor in the diagram can be a low power type but normally q 2 on the right. This mean that a tiny amount of current from a sensor micro controller or similar can be used to drive a larger load. Integr...