How to Make 1 Amp Power Supply – Electronics Mini Project

Hi friends, today we are going to build a 1A power supply, which will power your projects and save money on batteries. It is suitable as an adjustable power supply for your projects. you can use this current supply for driving DC motors, low voltage bulbs, etc. So let’s start.

Specifications of 1A power supply:

We are going to build a 1A power supply such that it will have maximum benefits and specifications to the user. Our 1A power supply circuit will have following specifications:

  1. Preset voltage range: 1.5V to 35V
  2. Maximum input voltage: 28V AC or 40V DC
  3. Maximum dissipation: 15W
  4. Short circuit protection
  5. Thermal and overload protection

For different output voltage, we need to choose a specific transformer. Following table shows how to select right transformer.

Choose right transformer
Choose right transformer

Components required:

  1. Diodes: D1, D2, D3, D4 = 1N4007
  2. Resistor: R1=120O
  3. Potentiometer: RV1=4.7KO
  4. Capacitors: C1=0.1µF (104)
  5. Electrolytic capacitors: C2=1µF, C3=10µF, C4=2200µF
  6. Voltage regulator: VR1= LM317
  7. SK1 and SK2 are terminal box.

Circuit Diagram:

1A Power Supply Circuit Diagram
1A Power Supply Circuit Diagram

Description:

Build the circuit as shown in circuit diagram. Connect the AC signal of the transformer (output of transformer) at SK1. Set the desired output voltage by the use of RV1 potentiometer. Mount voltage regulator LM317 along with heat sink if you are using high power application.

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