The excellent characteristics of the 2N3055 at high currents (high hFE and low collector-emitter saturation voltage) makes it ideal as a series regulator transistor in regulated power supplies. The power supply circuit shown below can be used when high current with low ripple is required. Q, and Q2 form a high power Darlington. ZD1 and R1 provide a reference voltage at the base of Q1 The voltage output will be:- VOUT = Zener Voltage - 1.2v
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