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

This is a straightforward circuit design for a regulated power supply, inspired by the classic LM 723 integrated circuit. The circuit employs a transistor (Q1) - specifically a 2N3055 type - which is driven by the LM 723 chip. The output voltage can be adjusted using a potentiometer (R1), allowing for a range of approximately 0V to 30V DC. To achieve an output of 30V, a suitable transformer (TR1) is required, which must provide sufficient current to meet the demands of the load. If the transformer does not deliver enough current, the output voltage may stabilize around 26V instead. It’s crucial to use a high-quality heatsink for transistor Q1, as it will dissipate significant heat during operation. Additionally, a robust potentiometer for R1 is essential to ensure longevity and precision.

Part List

R1 = 1.2KΩ C1 = 4700μF / 63V LM723 = Voltage Regulator V1 = 0-30V DCR2 = 680Ω C2 = 100nF, 63V MKT Q1 = 2N3055 TR1 = 220VAC / 27V, 4A R3 = 0.33Ω / 5W C3 = 4.7nF, 63V MKT B1 = Bridge Rectifier, 100V, 5A S1 = 2x10A Switch R4 = 15KΩ C4 = 220μF / 63V F1 = 0.5A Fast Fuse R5 = 3.9KΩ P1 = 4K7 LOG. POT. F2 = 2A Slow Fuse

This power supply setup is ideal for applications requiring a stable and adjustable voltage source. The LM 723 provides excellent regulation and stability, while the components listed ensure reliability and safety. Proper heat dissipation is critical, especially when operating at higher voltages or currents, so investing in a quality heatsink is highly recommended. Additionally, selecting high-grade components for R1 and Other critical parts will enhance the overall performance and lifespan of the circuit.