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Make this Car Air Ionizer Circuit

Make this Car Air Ionizer Circuit

The post discusses the construction of a car air ionizer circuit which can be used for cleansing the atmosphere of car interior from smoke, pollution, dust particles, bad odor, pollen particles etc. The circuit was requested by Mr. Edalcor Zuproc.

The Circuit Concept

In one of my previous posts we saw how simply a home air ionizer circuit can be built using a handful of capacitors and diodes. The unit works directly on our domestic mains outlet due to the availability of mains power.

The same circuit can be converted to function as a car air ionizer circuit by adding a converter stage to the above circuit.

The converter stage is a simple square wave inverter which converts 12V DC into the required 220V AC for operating the ionizer circuit.

As explained in my previous article, the basic design of the ionizer is taken from the Cockroft-Walton Ladder Network which involves a series. parallel connection of many diodes and high voltage capacitors.

How it Works

When powered with mains voltage the arrangement creates a push pull effect inside the circuit which results in stepping up of the voltage across the subsequent stages. At the far end of the ladder network this stepped up voltage may be as high as 4kV.

For obtaining the fundamental ionizing effect which is supposed to be having many health benefits the stepped up voltage should reach about -4kv.

At this potential, the free end of the radiator tip release negative ions by losing an electron into the atmosphere.

These ions being negatively charged attract everything that's neutral or positively charged.

Dust particles or any suspended particle in the air is by nature a neutral element and therefore when these particles collide with the negatively charged ions, they instantly stick with these ions.

The ions continue colliding with the atmospheric particles until each ion become loaded with these unwanted particles and become too heavy to float. When this happens the ions either get attached to the nearest wall or drop on the floor.

In this way all pollutants are neatly cleansed away from the air by the ionizer unit.

How to Build this Car Inonizer

In the diagram below we can see the circuit to be made up of two distinct stages. The section at the extreme left is the inverter stage, while the section on the right of the transformer is the ionizer stage.

The two stages should be constructed separately on two different boards and tested separately before integrating together.

The ionizer circuit stage which consists mainly of capacitors and diodes looks to be an easy arrangement to assemble, however the entire configuration is quite sensitive to bad solder or leakages through flux deposits.

Even a slightest bit of mistake can render the circuit unresponsive.

All the connections should be made with utmost care, making sure there's no dry solder or flux deposits in between the joined tracks.

The ionizer stage may be tested by powering it with 220V AC at home.

Be extremely careful as the entire circuit is directly linked with mains potential and can inflict lethal shock if touched without precaution. The procedures are explained in this room air ionizer article

The inverter part is much easier as the design includes just a pair of transistor and a few resistors. The transformer is a small 12-0-12V 500 mA type. After making it, power it with a DC 12V source and check the output, it should provide around 220V AC.

For the final testing, the above inverter output AC may be applied to the input of the ionizer circuit for acquiring the required ionizing effect of release of ions across the extreme tip of the ionizer circuit.

Circuit Diagram


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!

50 thoughts on “Make this Car Air Ionizer Circuit”

  1. Dear Swagatam,
    I want a negative ion generator/electron emitter to charge air with negative potential & subsequently charge the water particles. The main thing that I am looking in this unit is it should operate on my 12 volts dry cell type battery & should not involve any electric shocks while operating even if by chance I touch it. Kindly let me know if you have any such product or can make one or suggest where to buy one.
    Thanks & best regards,

    • Dear Santosh, when you convert 12V into -4kv then there will be a high voltage condition and a danger of an electric shock, it cannot be avoided.

      • Many Thanks for the speedy & prompt reply, so whats the solution for this requirement. I want this type of instrument to be handle by me at least for 2 to 3 hrs. a day to work better & I don’t want to get electrocute/burnt the very same time. Seek your expert advice/solution. I am ready to buy the unit.
        Thanks & warm regards,

        • You are welcome! The solution is to cover the circuit inside a plastic box and allow only the antenna to protrude out for the required radiation.

          • Glad to know that we have a solution to avoid the electric shock. Kindly guide where to buy this one. I really want a bundle of safe to handle negative ions/electrons.
            Thanks & warm regards,

            • Thank you for your interest, however this item will need to built by the user himself. I may try to build it in future and post a video but at this moment it may be difficult. sorry about it

            • Dear Swagatam, Appreciate your kind & prompt reply. Kindly let me know when I can have this one.
              Thanks & warm regards,

  2. Quick question. If instead of negative charge and negative ions one is interested in creating positive charge. What would be required to accomplish the same?

    Basically I need to create a high positive voltage and high positive charge for some experiment and came across this setup which creates just the opposite polarity and wanted to see if I can use the same setup with minor tweaks. Thanks.

      • Appreciate your quick reply Swag.
        As my intent was to get high voltage DC potential/ charge, to simplify my build I used an off the shelf high voltage ionizer like the one I have listed below.

        The thing I am trying to do is to get the opposite polarity than what this device generates. Do let me know if this is not feasible and if I need to build a circuit from scratch as described in this build with the additional step you suggested.

        Thanks again for taking the time to answer my question.

  3. Hello ! Mr. Swagatam
    I would like to ark about “Ionizer Generator” . I want to make 18-20kv from 12vdc and low current , How to do the best Ionizer ?

      • Thank for your reply, But I have making a some project about add more Ion into engine only. I have done as your circuit already. It was good condition for engine’s smoke. Then , I want to make a new one to get more ion to test again. Please

          • Thank you again. Yes, I have done with 0.1uF/630v. x 40 set. But, I can not measure voltage at the end of needle. The current more than 10a. It is too high. I think , It’s should not over 1A .

            • The value of the capacitor will determine the current level, and the voltage rating along with the number of ladder networks will determine the voltage level. With the shown network it will be not more than -4kv, if you double the number of ladders it will become -8kv and so on, but as you go on increasing the ladders the current will go down proportionately, therefore you may have to select the value of the capacitor accordingly for compensating the dropping current.

              You an take the help of the following article for more info on this:


            • 10 amp is too high, it means your circuit has problems, you must verify the connections carefully, and rectify the fault

      • Correction too much is bad for you a little is just fine. Ozone is generated by all ionizers, but its normally at a level thats not noticeable.

  4. The inverter is not working the transistor keep getting hot. plz if possible could you show the arrangement on a bread board for me

    • the circuit is not recommended for breadboard assembly please build it on a PCB….the circuit will definitely work, if done correctly.

  5. Hi Swagatam, how many miliAmpere (current) draw by this circuit from 12V car battery?
    When this project use continuously, how many current be need from 12V car battery?
    If you can describing the current consumption, I think it can be modified to increasing the efficiency.


  6. Hi,

    can this circuit be used to induce static electricity in objects? can this circuit replace a van der graaf generator? can I use this circuit to levitate small objects and do fun things like in fun-fly-stick?

  7. Hello Sir,

    will this negative ion generator work same way as van der graaf generator? can I use the above circuit to induce static electricity and try static electricity experiment like Fun-fly-stick with this circuit? will this circuit also act as negative ion gun?

  8. Hi Swagatam

    I want to make a smallest possible adapter to power a 40W soldering iron with a 12V battery. Can I use the converter circuit mentioned above. If not, would you please recommend me one.

    • Hi Abu-Hafss,

      Yes you can try the converter stage for powering a 40 watt soldering iron, but the battery will need to be at least 15ah rated.

    • Battery is not a problem. I was just wondering if 12-0-12, 500mA transformer would be suitable to give 40W at 220V.

      According to my understanding, the input is

      24V x 0.5A = 12VA ≈ 12W

      So, maximum we can get 12W at the output. I think a 12-0-12, 2A would be suitable to give 48W. What do you say?

      If yes, do we need to upgrade the transistors?

    • Multiply the transformer current with its voltage rating, does it equal 40 watts?? In fact the rating should be in excess to the required mark by a reasonable margin, only then it would produce the desired output.

      12 x .5 = 6 watts, that's what you would get at the maximum from a 500 mA trafo.

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