Here is a regulated power supply using a V-MOS power FET as an adjustment tube. The DC output voltage can be continuously adjusted from 1.25V to 12V. When the output current is 50mA (10 square centimeter radiator is required), the voltage fluctuation does not exceed 0.3%, which is suitable for all kinds of small appliances.
Current principle
The following figure is the schematic diagram of the regulator. The principle is basically the same as that of the ordinary series regulator. The difference is that the field effect is used as the adjustment tube. Because no large current is required, the circuit is simplified and the cost is reduced. And the voltage regulation performance has improved. In the figure, the resistors R1, RP, VD5 and LED form a continuously adjustable constant voltage source, which provides a reference voltage for the VT3 base. R1 is a current limiting resistor; RP is 4.7K with a switching potentiometer, VD5 is a 9~10.5V voltage regulator; VD6 is a red LED; the series regulation of VD5 and VD6 determines the maximum output voltage of the regulated power supply; VD6 It also doubles as the power indicator and load current size indication. When one tube is used more, the operating current of the regulated power supply is larger, the darker the light-emitting tube.
Figure power field effect tube for the regulation of the regulator power supply circuit diagram component selection and production power field effect tube can choose V40AT and other plastic sealing tube; T select the output voltage of about 15V transformer; other components have been noted in the figure.
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