Published:2011/5/29 20:15:00 Author:Ariel Wang | Keyword: adjustable, DC , steady voltage | From:SeekIC
Over current protected circuit is made up by the 13th foot internal circuit of IC,transistor V3,V4,resistor R1,R3-R6,capacitor C2-C4,diode VD7 and LED VL2.When switch S of power-supplyis gottenthrough,the 220V AC voltage is dropped down through T,commutated through VDl-VD4.It lights VL1 up through R2.It is connected to emitter of V3 through R4.And it lights VL2 up at the same time.It is isolated and filtered through VD5 and C1.It generates the voltage of around +23V voltage. And it is connected to the 12th foot of IC and collector of V1. The +23V voltage is regulated and adjusted through circuit.It outputs steady DC voltage from the emitter of V1. You can adjust the resistance of RP,in order to make the output voltage change continuously between 0-+20V.
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