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Monday 23 June 2014

Circuit Diagram to Supply Steady 5V DC Power Supply to Microcontroller

by realfinetime  |  in Voltage Regulator at  00:58

Constant power supply is an important factor for the proper working of Microcontrollers. Voltage is commonly regulated using 7805 Voltage regulator.

Features of 7805 regulator.

1. Three terminal regulators.
2. Internal Short-Circuit Current Limiting.
3. Output Current up to 1.5 A.
4. Output Transistor Safe-Area Compensation.
5. Internal Thermal-Overload Protection
6. High Power-Dissipation Capability

Positive line of the regulator output is given to the VCC ( Pin 7 ) of the microcontroller and negative line of the regulator output is given to the GND pin ( Pin 8 ) of microcontroller. Pinout diagram of ATMega328 is given below.

Don't forget to put a .33micro Farad capacitor at input side and a .1 micro Farad capacitor at the output side of the regulator.

If your circuit is correct, then your microcontroller will working on a constant 5 voltage. Circuit will work even if the capacitors are not connected. But its better to add capacitors for the longer life of your voltage regulator and microcontroller.


  1. What is the diagram software you used to create these circuit diagrams. it looks very simple and nice.

    1. I am using Gimp and paint in linux for designing the circuits.

  2. I am truly pleased to read this information which carries lots of helpful data, thanks for providing these kinds of statistics. Thank you. For any detail on Custom Power Supply contact us.



All the circuits, published in this blog is only after testing and getting proper results in my private lab. When you try these circuits, you should check the supply voltage, polarity of components, presence of childrens nearby and shorts in the circuits. This website will not be responsible for any harm happened to you or your components caused by your carelessness.

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