Friends ever meet a problem experience Electronics Circuit at want the level Voltage various? Today I begs for to suggest Muti lab power supply 15V,30V,45V,60V Circuit may meet the requirement of friends get. By it is the circuit is simple use the transistor = 4 pcs (C1061,A761,2N3053,2N4037) only and Zener Diode ZD30V = 2 pcs. Only. The transistor have equiv number many the number. but however this circuit inappropriate for you who want current tall. Because it gives current 0.5A only just. This circuit idea friends, may apply the work has please yes.