Home » Home Electrical Circuits » How to Build an Ozone Water/Air Sterilizer Circuit – Disinfecting Water with Ozone Power
How to Build an Ozone Water/Air Sterilizer Circuit – Disinfecting Water with Ozone Power

How to Build an Ozone Water/Air Sterilizer Circuit – Disinfecting Water with Ozone Power

We are all familiar with thundering and lightning during stormy weathers and know how the effect is responsible of producing a lot of ozone and negative ions in the atmosphere. The same concept has been employed in the proposed water and air sterilizer circuit.

Properties of Ozone

Ozone is a pale blue gas having a pungent order (akin to chlorine) with the chemical formula O3. In the atmosphere ozone may be produced due to the presence of strong UV rays or electrical discharges as during thunder lightnings.



The above mentioned phenomenon produce ozone basically by knocking down the dioxide oxygen molecules (O2) which are present plentifully in the atmosphere, resulting in O2 → 2O.
The resultant free radicals generated as 2O collide around the source forming  O3 or Ozone. The process continues as long as the source (lightning arcs, UV rays) keep their presence.

By nature Ozone is a very strong oxidant even stronger than dioxide. This property of ozone is helpful in killing germs, parasites and other microorganisms which may be regarded as pests and hence is used as sterilizer for disinfecting water and air.

However, the strong oxidizing property of ozone could be also harmful for humans and animals and could cause respiratory issues if inhaled for longer periods of time inside a non-ventilated premise.

The above discussion shows that ozone can be actually produced very easily either through unsuppressed arcing or through UV rays and used for sterilizing water or air appropriately.

Implementing Unsuppressed Spark Arcing

In the proposed design we incorporate the unsuppressed arcing method since it's more effective and easily implementable.

Producing artificial arcing can be simply done by using a boost circuit topology wherein a high frequency is dumped into a booster coil for generating the required high voltages.

The resultant voltage being in kVs can be forced to arc by bringing the ground terminal close to the high tension terminal from the coil.

The best example of this could be a CDI circuit using the ignition coil as the kV generator, which are normally used in vehicles for generating ignition sparks inside the spark plug.

The following diagram illustrates how a CDI circuit may be used as a ozone generator for sterilizing water, air, food etc.

The lower 555 IC circuit is used for triggering TR2 which is an ordinary step down iron core transformer. It's primary is oscillated at its rated voltage through a frequency set by the 100k pot.

This results in the induction of 220V or whatever may the rating of the secondary high voltage winding of the transformer.

Using a Capacitive Discharge Circuit

This induced 220V is fed to the following CDI or the capacitive discharge ignition stage consisting the scr and the ignition coil as the main components.

The SCR along with the high voltage capacitor and the associated diodes fire at the given frequency forcing the 105/400V capacitor to charge/discharge rapidly, dumping the stored 220V at the same rate into the ignition coil primary.

The result is the generation of around 20,000 volts at the secondary high tension output of the ignition coil.



This output is appropriately terminated close to another terminal derived from the negative of the supply.

Once the above set up is configured, the arcing initiates instantly causing the ozone to be generated around the spark zone.

Since excess generation of the ozone could be harmful for the living beings in the premise, the circuit could be triggered through a programmable timer such that it stays switched ON only for some predetermined period of time and gets switched OFF automatically once the set time elapses.

This would ensure the safe amount of ozone to be produced in the premise.

The arcing may be introduced inside any chamber wherein the intended materials or ingredients may be placed and the unit switched ON for initiating the sterilizing actions through the generated ozone gas.

Circuit Diagram

Ozone Water/Air Sterilizer Circuit

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About the Author

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!



25 thoughts on “How to Build an Ozone Water/Air Sterilizer Circuit – Disinfecting Water with Ozone Power”



  1. https://imgur.com/zG0a00s
    Dear Sir, I am making an air disinfection Ozone transmitter, vegetables, I seem to have the circuit of an ozone generator as shown in the attached image, but I don’t know which IC used in this circuit. I doubt it is NE555 IC as the circuit you have shown above but unfortunately it is not.
    Can you help me know what IC name it is? I only know its 3 pin information like it, please help me.
    Thank you!
    My circuit looks like this product: https://www.greentechenv.com/purifiers/index.php/products/pure-air/pureair-fridge.html

    • Hi Tanaka,

      I am sorry I am unable to identify the IC, yes it’s certainly not IC 555.

      However if you are trying to build a smaller version of an ozone purifier you can easily do so by modifying a mosquito bat circuit. You can integrate an external pulsing circuit to produce a 1 second or 2 second arcing, and this will be enough to generate the required amount of ozone inside the refrigerator.

  2. Hello Swagatam,
    Thank you very much for giving your valuable time in answering our questions.
    Need one more help please can you design Negative ion generator circuit with the input should DC not AC.
    Thanks and Regards.
    Taibani Imran.

  3. Hello Swagatam.
    Nice project, I need your help for making this more powerful.
    Like if CDI is generating 20kv. How it can generate 50kv.
    Can you guide me please.
    Thanks and regards.
    Taibani Imran.

    • Hello Imran, I think you can try replacing the shown motorcycle ignition coil with a car ignition coil and see the difference, because a car ignition coil would be much powerful than a motorcycle coil and produce stronger pulses.

  4. Thanks Swagatam ! I have another question, can you send me the link of the detailed schematic diagram ? i cant find it here in your site. thanks !

  5. Good day swagatam ! I have a question how should i implement it to sterilize a water ? should i put the output directly to the water ? thanks for this.

    • Thanks Ryan, just bring the high tension wire end near the ground wire through a needle arrangement such that these are held 1 inch apart or at a distance where arcing or sparking just initiates and is sustained.

      this arcing terminals can be enclosed inside a water tank permanently for executing the sterilizing action, the water may be kept in a cycling motion through a motor propeller mechanism for enabling an effective contact with the generated ozone atmosphere inside the container

  6. Dear Swagatam,
    2 questions more sorry..
    All transformers (for buy) are AC/AC right?
    And how many volts should be in the part of 230 Volt of the transformer? like 230volts?
    Thank you

    • Dear Victor,
      TR2 is an ordinary step down transformer with rating: 0-12V/1amp/220V

      the red one could be any standard automobile ignition coil…

    • Thank you for your quick response,
      Which is the capacity of the condenser near the diodes?
      And which amperage is recommended to have the 230v transformer?
      I will try it and let you know, thank you

  7. Please sir, i have a question about the Op-amp. My question is: If an op-amp is fed with a supply voltage of 9v for instance, can you generate more than that 9v at the output assuming the gain is properly defined? In simple words, can you generate 15v from 5v input in an Op-amp that is powered with a supply voltage of 12v? If yes, will the output current be significant?



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