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How to build 1.5 - 35 Volt DC Regulated Power Supply
September 30, 2010 - category: DC power supplyDescription
Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, adjustable between 1.5 and 35 volts at 1 ampere. This circuit is ready to use, you just need to add a suitable transformer. This circuit is thermal overload protected because the current limiter and thermal overload protection are included in the IC.
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:
- Just add a suitable transformer (see table)
- Great to power your projects and save money on batteries
- Suitable as an adjustable power supply for experiments
- Control DC motors, low voltage light bulbs, …
Specifications :
- Preset any voltage between 1.5 and 35V
- Very low ripple (80dB rejection)
- Short-circuit, thermal and overload protection
- Max input voltage : 28VAC or 40VDC
- Max dissipation : 15W (with heatsink)
- Dimensions : 52x52mm (2.1” x 2.1”)
Technical Specifications
- Input Voltage = 40Vdc max Transformer
- Output Voltage = 1.5V to 35Vdc
- Output Current = 1.5 Amps max.
- Power Dissipation = 15W max (cooled)
Note:
It has not to be cooled if used for small powers. 28 Volt AC max is allowed for the input voltage.
circuit from http://www.extremecircuits.net/2009/10/easy-way-to-power-your-projects-here-is.html
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