1.5 - 35 Volt DC Regulated Power Supply

The easy way to power your projects

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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.

Circuit diagram:

1A Regulated Power Supply Circuit Diagram

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Transformer selection chart:

Transformer selection Guide-Table For Power Supply

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Parts:

IC = LM317

P1 = 4.7K

R1 = 120R

C1 = 100nF - 63V

C2 = 1uF - 35V

C3 = 10uF - 35V

C4 = 2200uF - 35V

D1-D4 = 1N4007

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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, …

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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”)

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Technical Specifications

• Input Voltage = 40Vdc max Transformer
• Output Voltage = 1.5V to 35Vdc
• Output Current = 1.5 Amps max.
• Power Dissipation = 15W max (cooled)

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Note:

• It has not to be cooled if used for small powers. 28 Volt AC max is allowed for the input voltage.