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Build Your Own 1.5-35V DC Power Supply
Description
This document presents a circuit diagram for a regulated DC power supply. It’s a compact power supply capable of generating a stable, adjustable voltage ranging from 1.5 to 35 volts at a maximum current of 1.5 amperes. This circuit is immediately usable; only a suitable transformer needs to be incorporated. The design incorporates thermal overload protection, utilizing an integrated circuit for enhanced safety and reliability.
Picture of the circuit:
Circuit diagram:
Transformer selection chart:
Parts:
- IC = LM317
- P1 = 4.7K
- R1 = 120R
- C1 = 100nF - 63V
- C2 = 1uF - 35V
- C3 = 10uF - 35V
- C4 = 2200uF - 35V
- D1-D4 = 1N4007
Features:
- Only a suitable transformer needs to be added (see table)
- Ideal for powering various projects and reducing reliance on batteries
- Suitable as an adaptable power supply for experimental purposes
- Can control DC motors, low voltage light bulbs, and other applications
Specifications :
- Voltage adjustment is possible between 1.5 and 35V DC
- Very low ripple (80dB rejection) is achieved
- Short-circuit, thermal, and overload protections are integrated
- Maximum input voltage allowed is 28 VAC or 40 VDC
- Maximum heat dissipation is 15W (with a heatsink)
- Dimensions are 52x52mm (2.1” x 2.1”)
Technical Specifications
- Input Voltage = 40Vdc max, supplied by a transformer
- Output Voltage = 1.5V to 35Vdc
- Output Current = 1.5 Amps maximum
- Power Dissipation = 15W maximum, provided a heatsink is utilized
Note:
Cooling is generally unnecessary when operating at low power levels. A maximum input voltage of 28 VAC is permitted.
Integrated Circuit Description
The LM317 is a three-terminal adjustable low-power shunt regulator IC. It operates as a linear regulator, converting a higher DC voltage to a lower, stable DC voltage. This particular IC provides the core regulation functionality within the power supply circuit. Its adjustable nature allows for precise output voltage control. The IC’s pins facilitate both input and output voltage control, enabling the creation of a customizable power supply. It’s critical to observe the datasheet specifications for optimal operation and thermal management.