15 April 2010

1.5 - 35 Volt DC Regulated Power Supply


 
The easy way to power your projects



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:
 1A 1.5 volt to 35 volt dc Regulated Power Supply Circuit 
Schematic
1A Regulated Power Supply Circuit Schematic


Circuit diagram:
 1A 1.5 volt to 35 volt dc Regulated Power Supply Circuit Diagram
1A Regulated Power Supply Circuit Diagram


Transformer selection chart:
  Transformer Selection Chart for 1A 1.5 volt to 35 volt dc 
Regulated Power Supply Circuit Diagram
Transformer selection Guide-Table For Power Supply


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.
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