Here is a simple circuit for boosting 12 V DC to 24 V DC .The circuit is designed straight forward and uses few components.With few modifications the circuit can be used to boost any voltages.

The transistor Q1 and Q2 (D1616)  essentially drives the primary of the transformer.The diodes rectifies the output of transformer to obtain a 24V DC at the output load(here a fan).The capacitors filter away noise and harmonics away from the output.

Circuit diagram with Parts List. 



  • The component values are not very specific here.We can use any NPN power transistors like D1616,2N 3055,C2236,SL 100 etc for Q1 and Q2.
  • The transformer can be any center tapped 5A transformer with a  7:1 winding ratio.
  • The diodes can be 1N 914 ones.
  • In fact you can easily assemble the circuit from the components in your electronics junk box.
  •  By experimenting on the tranformer winding you can get different boost ratios.
  • For high current (around 5A)  games use 2N 3055 transistor or more powerful Darlington pairs for Q1 and Q2.


  1. The Lightning Stalker

    You have used this image without my permission and removed the link to my site and the copyright.

  2. hi i have an 3.7v 300mA BATTERY i want to make it output 5v
    can you help me i nt to make an mobile charger

  3. Please mail me:1. How I can charge two 12V/60AH batteries (fastly)using 12V A.C source from generator charging point. 2. How I can obtain fast charging system of 12V from a 12V charging system from generator charging point. Please with specified circuit components…….Martins(

  4. an you give to me the all details about the each value of part list of this circuit,as soon as possible.