similar circuits


1.5 - 35 Volt DC Regulated Power Supply

Description

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:

1.5 - 35 Volt DC Regulated Power Supply-Picture of the circuit

Circuit diagram:

1.5 - 35 Volt DC Regulated Power Supply-Circuit diagram

Transformer selection chart:

1.5 - 35 Volt DC Regulated Power Supply-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