-15 V 1-A Regulated Power Supply

-15 V 1 A Regulated Power Supply

The actual supply should get -20 V coming from rectifier/filter that is given to the collector of Darlington PNP-type pass transistor, a TIP 105. The base drive for the TIP105 is supplied  via resistor R5. The base of the TIP is driven from Vz terminal at pin 9, this is anode of 6.2 V zener diode which links with the emitter of uA 723 output control transistor. The way of providing the positive feedback needed for feedback action is shown.

This method introduces positive feedback by raised current flow via resistors R1 and R2 under short-circuit conditions. This forward biases the base-emmiter junction of the 2N2907 sensing transistor. which will lowers base drive to the TIP 105. ( Texas Instrument,Linear and Interface Circuits Applications, Vol I )


Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.


Tags: 1 Ampere power supply 15 Volt power supply ua723 regulator

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