+50V 3A adjustable power supply - Power Circuit - Circuit Diagram

This circuit is designed to provide an output ranging from +40V to +60V at 3A, with simultaneous stabilization. The components used are relatively simple, making the manufacturing process straightforward as long as you pay attention to certain key points. [1] For output voltages between +40V and +50V, the Q1 transistor generates significant heat, so it requires a large heatsink. [2] The potentiometer RV1 is included to adjust the output voltage between +40V and +70V. However, after completing the adjustments, it might be more cost-effective to replace it with fixed resistors. This adjustment can vary by up to 3V over time when using a potentiometer. **ATTENTION**: The positive output corresponds to point [A], while the 0V output is at point [B]. These should not be connected to the ground.

Parts List:

R1 = 10Kohm R8 = 1.8Kohm, 0.5W Q3 = BC303 or BC461 R2 = 1 ohm, 5W R9 = 3.3Kohm, 0.5W D1-4 = Bridge 15A R3 = 3.9 ohms, 1W RV1 = 470 ohms potentiometer D5 = RED LED, 5mm R4 = 6.8Kohm, 1W C1-2-4 = 4700uF, 100V D6-7 = 10V, 1W Zener R5 = 390 ohms, 1W C3-5 = 100nF, 250V MKT D8-9-10 = 1N4007 R6 = 100Kohm, 0.5W Q1 = 2N3055 on heatsink T1 = 230Vac / 55V, 3A R7 = 1.2Kohm, 1W Q2 = BD162 or BD243 or BD543 Assembling this circuit requires attention to thermal management and proper component selection. If these considerations are taken into account, building this circuit can be a rewarding project for hobbyists and professionals alike.