This is a productive post with a voltage stabilizer circuit with 4 relays. A voltage stabilizer is sometimes becomes essential for our appliances if the supply voltage is not stable. Here in this post, you’ll find a product that can help you.

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 missus or harmful act. Most of the projects published here are open source; anything copying and directly posting on your website and then claiming it as your is a prohibited and nonsensical act. A project can be open-sourced, but to make a working product needs lots of effort. As products make money from a business, products are not free, but knowledge will always be free. If you want to grow your business using our products, you should pay for that. Thanks.

Why do we need a voltage stabilizer?

Our supply line whatever the voltage configuration is depending on country location (50Hz/60Hz, 220V/110V/120V) not stable all the time. In some areas, the voltage fluctuates a lot. That herms our appliances. To maintain a suitable voltage range, an electronic device named a voltage stabilizer can be used.

There are different types of voltage stabilizers in the market. Some of them use relays, some use autotransformers, some use IGBTs, and so on. I’ve some other articles on this, you can check them too.

How to make a voltage stabilizer A-Z

After reading the previous article, you got some ideas on how we can make a voltage stabilizer. Now, whatever the method we selected, the most common one to make is using the relays. We can use many relays if we want, more the relays, more the correction accuracy. But for a product, the optimum one is with 4 Relays. This one will help in most of the ranges. Here, we will see a product that is designed with the optimum result.

Our voltage stabilizer card:

These are the blank PCB. Optimized design and form factor are also standard for products. You can buy this PCB design from here.


The auxiliary 18V needs only 1A, You can keep it 2A for safety. And the main winding should be designed based on your power capacity. Note the relays are suitable for up to 800VA for this range.

The Program:

The .hex file is also here for sale. You can get the hex file from here.

Test result:

Here is the test result. Check before buying the files for your mental satisfaction.


This is a product, not a project. There are some other educative tutorials on my blog. If you are not interested in buying the design then you can check the other articles where I published the working mechanism. Following that, you can make one of these products. I hope you understood. Thanks a lot.


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I'm Mithun from Bangladesh. Electronics is my passion, love to work with electronics. This is my personal blog. Besides my regular works, I write some articles here. Most of them are open-source and everything is presented in the easiest way so that anyone can understand and learn it. Thanks.

1 Comment

Godwin · October 11, 2021 at 8:33 pm

Please,can you please upload the circuit diagram

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