0-30V 1A Variable power supply using  IC-741,2N3055 & 2N3565
This is 0-30v variable power supply circuit with PCB,at 1A. It is old circuit I used IC UA741 or LM741 OP-AMP IC for control adjustable Voltage by VR1 (see in image circuit). The transistor 2N3055 is classic part for booster current up to 1A min. I used transformer 2A. it …