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The adjustable power supply can be adjusted between 3.5V and 25V, the output current is large, and the adjustable voltage regulator circuit is used to obtain a satisfactory and stable output voltage.
Working principle: After rectification and filtering, the DC voltage is supplied to the base of the adjusting tube by R1, so that the adjusting tube is turned on. When V1 is turned on, the voltage passes through RP and R2 to make V2 turn on, and then V3 is also turned on. At this time, V1. The emitter and collector voltages of V2 and V3 no longer change (the effect is exactly the same as the Zener). Adjusting the RP can obtain a smooth output voltage. The ratio of R1, RP, R2 and R3 determines the voltage value output by this circuit.
Component selection: Transformer T selects 80W ~ 100W, input AC220V, output double winding AC28V. FU1 selects 1A, FU2 selects 3A~5A. VD1 and VD2 use 6A02. RP selects 1W or so common potentiometer, the resistance value is 250K~330K, C1 selects 3300?F/35V electrolytic capacitor, C2, C3 selects 0.1?F monolithic capacitor, C4 selects 470?F/35V electrolytic capacitor. R1 selects 180~220Ω/0.1W~1W, R2, R4, R5 selects 10KΩ, 1/8W. V1 selects 2N3055, V2 selects 3DG180 or 2SC3953, V3 selects 3CG12 or 3CG80.
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