Trebam shemu za LED dimmer

Treba mi shema za regulaciju intenziteta svjetla, namjeravam spojiti 10 bijelih LEDica, znaci struja je 200mA, a napon 3.8 max. Dakle, sve bi regulirao jednim potenciometrom, s tim da s njim mogu i iskljuciti krug, znaci od slabog intenziteta do maximalnog. Googlao sam, ali nisam nasao rjesenje. Hvala!

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Ivan
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