Adjustable power supply 0V-30V DC/2A-power circuit - Circuit Diagram

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This is a straightforward regulated power supply circuit based on the LM723. It drives a transistor Q1 (2N3055). The voltage regulation is controlled by potentiometer R1, which can adjust the output from 0V to approximately 30V DC. To achieve an output of 30V, the input transformer TR1 is crucial; it must provide sufficient current to meet the load requirements. If not, the output voltage may stabilize around 26V. Proper heat dissipation is essential for transistor Q1, and a high-quality potentiometer should be used for R1.

Component List

R1 = 1.2Kohms C1 = 4700uF / 63V C1 = LM723 V1 = 0-30V DCR R2 = 680ohms C2 = 100nF 63V MKT Q1 = 2N3055 TR1 = 220VAC / 27V 4A R3 = 0.33ohms / 5W C3 = 4.7nF 63V MKT B1 = Bridge 100V 5A S1 = 2x10A SW R4 = 15Kohms C4 = 220uF / 63V F1 = 0.5A Fast Fuse R5 = 3.9Kohms P1 = 4K7 LOG. POT. F2 = 2A Slow Fuse
This simple regulated power supply design uses the LM723 chip to control the output voltage via transistor Q1 (2N3055). Adjusting the potentiometer R1 allows for fine-tuning between 0V and 30V DC. For optimal performance at 30V, ensure the input transformer TR1 provides enough current for the load; otherwise, the output might hover around 26V. It's important to use a robust heatsink for Q1 and a high-quality potentiometer for R1 to prevent overheating and maintain precision.

Connector And Switch

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