Sometimes, you may need to make a DC/DC converter with minor components that can handle small loads. In this article, we are going to make something like that. This DC/DC converter using transistor has only a few components and can handle small loads or higher voltages, suitable to use with a small AA battery. So let’s start!

Disclaimer: Electricity is always dangerous. Proper skill is required to work with electricity. Do work at your own risk. The author will not be responsible for any misuse or harmful act or any mistake you make. The contents of this website are unique and copyright protected. Kindly don’t do any nonsensical act copying and claiming it as yours. Most of the articles published here are kept as open-source to help you. Take the knowledge for free and use it, but if you are interested you can buy the ready resources offered here. If you need any help or guide feel free to comment below, the author will try to help you. Thanks.

When do you need this type of DC/DC converters?

When I was working on a project, I found that I need to drive a buzzer of 12V from a source of 3.7V LiPo. But the circuit should not be costly and should be as small as possible. After looking at similar circuits over the net, I found several circuits but only one was satisfactory. After little modification, that circuit becomes very useful to me. That is why I’m sharing this circuit so that you may get some help.

When you need to drive a small load such as a sensor, or a buzzer, or a relay with a battery of 1.5V, or such a source then you can use this type of DC/DC converters.

Circuit diagram:

DC DC converter circuit

Working principle:

This is actually an Astable multi-vibrator using Transistors. With a small change in its configuration, this DC/DC converter is designed. The Q1 & Q2 are the same transistors. Once the power is up, the Q2 starts switching until C1 gets charged. Once C1 is charged, Q1 triggers as there is no pull down to its base through R3 & C1. This turns Q2 off. Once Q2 is off, as C1 was charged, it triggers Q2 through R2 and R3. This process keeps going until power is sufficient.

PCB [if required]:

DC DC converter circuit PCB

Test result:


This article was a small one but can be helpful in the right situation. This dc dc converter circuit is only suitable for small loads driving from low voltage sources. So when you use this keep that in mind. Thanks.


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This is a personal electronics blog. The author loves to write on different topics and shares his knowledge to help others.

1 Comment

Enrique · October 22, 2021 at 5:36 am

Excellent project like all his works. Thank you

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