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5v circuitboard

5 volts power supply circuit

We are going to design a simple 5 volts power supply circuit that we shall use in our subsequent projects. note that this project require the 250v ac current and its very dangerous. therefore you must taker care of yourself while trying to implement this project. Gartex will not be liable for any damages whatsoever as a result. 

Components required

  1. 4 Diodes (1N4007 )
  2. Capacitors (2200µF, 0.33μF,  0.01μF)
  3. Transformer (9v 500mA)
  4. Resistors
  5. L7805 voltage regulator 

L7805 IC Description

Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. In our case the 7805 IC is an iconic regulator IC that finds its application in most of the projects. The name 7805 signifies two meaning, “78” means that it is a positive voltage regulator and “05” means that it provides 5V as output. So our 7805 will provide a +5V output voltage.

The output current of this IC can go up to 1.5A. But, the IC suffers from heavy heat loss hence a Heat sink is recommended for projects that consume more current. For example if the input voltage is 12V and you are consuming 1A, then (12-5) * 1 = 7W. This 7 Watts will be dissipated as heat. 

Applications of L7805

  • Constant +5V output regulator to power microcontrollers and sensors in most of the projects
  • Adjustable Output Regulator
  • Current Limiter for certain applications
  • Regulated Dual Supply
  • Output Polarity-Reversal-Protection Circuit

circuit diagram

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