PWM parts and diagram

Here’s the Parts list: thanks to Nine_Dots

For the capacitor use any of these

1 – 1000uf 50v (Radio Shack – $2.59)
1 – 708uf to 850uf 125VAC to 165VAC
(take it off an old motor control if you have access)

(You can rape this from an old ATX power supply)
680uf 200v
1- For the PWM, use one of the 30a 12v-24v dual transistor DC motor controls you can find all over Ebay. Expect to spend between $30.00 to $40.00. This should be the most expensive part.

1 – >GBPC3506 35A 600V bridge recitfier
(You can buy these on Ebay as well for next to nothing)
1 – >GBPC3504 35A 50V bridge rectifier
(You can pick one of these up at Radio Shack for about 3 bucks I think. I’ve burned through so many, I really can’t remember anymore, but I know they’re not very expensive.)

and the diagram for assembly:

PWM wiring diagram

PWM wiring diagram


31 Responses

  1. Okay folks, y’all are more expert than I and don’t need anyone to tell you what an HFE is or what a PWM is and what it’s for an an HHO system.

    If HFE means Hydrogen Fuel E —?———, then it’s some kind of misnomer isn’t it? It’s not hydrogen in use in one of the jamjar systems; it’s HHO! Different!!

    But PWM is completely mystifying. Whuzzit dooo, plzzz?


  2. HFE = Hydrogen Fuel Enhancement, HHO = Hydrogen Hydrogen Oxygen, aren’t we attempting Hydrogen Fuel enhancement with HHO?
    PWM = Pulse Width Modulator, from what I understand it hammers the cell with square wave pulses of DC current allowing HHO to be made with pure distilled water with no catalyst, although some still use a small amount.

  3. Hi Guys,

    Thanks for posting that diagram up there. That’s exactly the way it should look. In the near future I’ll get some more advanced designs up for you guys that use a few more parts but produce a lot more gas.

    Also, PWM = Pulse With Modulation, my bad if I ever included a D somewhere in that.

    Anyway, as for HFE and HHO what needs to be understood is that you are producing HHO gas that is being injected into your current fuel supply which in turn enhances your combustion. Because you are using this gas, you are injecting 1/3 Oxygen into the system along with 2/3 Hydrogen, hence 2xH and 1xO. This is why you need the EFIE to control your oxygen sensors. Collectively the entire system is dubbed HFE. I hope this helps to clarify a few things.

    Another thing that should be understood is the difference between HHO gas and H2-O2 Gas. When you use a catalyst in your production chamber you will produce H2 and O2. When burned, H2-O2 will produce water vapor, but it also produces O3 which is not so good for you or the environment. Even worse, if you use baking soda as your electrolyte, you’re also producing Sodium Hydroxide,…A toxic gas that can kill you in fair amounts.

    The product of using distilled water is HHO as in elemental gas. If you split one water molecule you get 2 Hydrogen atoms and one Oxygen atom as free atoms, no further bonding. There is a huge difference because you are producing nothing more than water vapor when burned. Another detail to mention is no Sodium Hydroxide, no ferris particulate in your water and equally as important, no material loss to your electrodes. Where do you think all that ferris particulate is coming from?

    All the nasty chemicals aside, I understand people worry more about their wallets than the environment. This is just human nature. By using an electrolyte in your water you will notice that after 20 to 30 hours of operation that your electrodes are getting smoother on the surface. This is because they are actually losing ferris material and eventually you’ll have no electrodes left. At this point you’re wasting money on replacement materials for more stainless steel electrodes. For this reason alone you may want to seriously consider using no electrolyte.

    I hope I’ve been able to help some you of understand this technology a little better.

  4. Nine_Dots,
    Thanks again for all the help, I ordered a pwm sun evening, already got the Cap and bridge, cant wait to try it out on my dry cell!
    its very small cell 2×4 plates, 9 plates, +NNNN-NNNN+ config and produces .6L/min @ 6 amps. Strangely I cant get over 12a draw from it even with 10tsp NaOH/L , and it surged to 15 then dropped to 12 and stayed there no matter what the water flow is, from 200ml to 700ml/min. Did notice bubbles trapped at top at 200ml/min but blew them out at 500ml/min. gas and water holes are 5/16″, Might be spacing, only .040 spacing. Stays cool for 1/2 hr that I’ve run it, in fact my temp probe, a truckers style meat probe that reads up to -20 to 150 deg showed only 2 deg change in 1/2 hr, so heat doesn’t look to be a problem.
    Already looking for someplace to cut me some more plates for a new dry cell, a little larger, and minor changes in design, for a 3x3x3 cell with 41 plates.
    I’ll get back to everyone after I test the PWM with the results.

    • see mr what happan to we all making cell belind tecnologe battery power 12v dc but our making cells 6 plate mens 5 gap avallable but each gap voltage mainmum 3v dc to pass full active plate kepp speace min 6mm -nnn+ it give better result plate sige 100mmx200mm x9

  5. Hello,

    I’ve tried Nine_Dots electrics but got got no results. I think you should wait for some positive feedback before everyone spends a lot of time and money on this.


    PWM = Pulse-Width Modulator NOT Pulse with Modulation. They are generally used with DC electric motors to control speed but can also be used with HHO generator to control current and therefore heat.

    and……… Sodium Hydorxide is a solid in the form of white crystals. It is used to clean drains when dissolved in water. It is NOT a toxic gas.

    • Hello Sir

      I used HHO cell on my VOLVO bus B7R but I find HHO cell is getting brown in colour.
      I dont know what exactly happening please suggest me with details.


  6. yep, your right about the NaOH, but Nine_dots is partially right, baking soda, it does leave the bubbler and cell with the gas and leaves nasty deposits in the hoses and more importantly possibly inside the engine. Caustic soda turns into NaOH and can make some nasty heat when combined with aluminum, which most engines now days have plenty of, releasing H2, and degrading the aluminum.
    As far as PWM, see my glossary, your right, but if you vary the frequency too isnt that pulse width modulation?
    I also tried the pwm today, all different cells with Neutral plates produce nothing, or so little its not effective.
    I reconfigured my dry cell to 8 plates, +-+-+-+-, and it produced just fine, and probably a little more. And just to be arbitary I used good old hometown tap water, and in 30 mins operation saw no scum or discoloration, yet. The max that this configuration drew is 6a, although it still draws 9a surge for about 10 sec.

  7. Did you use the rectifier and capacitor or just the PWM??

  8. Cap and bridge, just as diagram shows with the PWM.

  9. One note on the bridge, I got a 25a one from radio shack, at 24amp it heats up fast, and too hot to touch, and made me wonder if the plastic box it was going into could handle the heat, so I added a heat sink to it from an old power supply.
    Dont forget to add a cooling fan to the box, Radio shack has 12v cooling fans for 9.99, and cut cooling slots for air to enter or escape depending on the direction you mount it, I opted for sucking out, just as a safety measure against moisture since it will be in a car. The largest hole, the fan, isnt sucking a mud puddle into th electronics.LoL
    And of course after reading the supplied literature and looking online, nothing said other than to bolt it down to an aluminum plate. DUH! where does ‘bolt to aluminum plate’ say ‘heat sink’ to the novice?

  10. I am just starting to experiment with these systems, and I am really interested in this!! I have built a small generator and after say 15 – 20 mins of operation the unit plugs up with gunk and stops producing HHO. I have seen your post on Dry Cells and I am really interested in this instead of a wet cell. I find the electronics part reall confusing and I really don’t understand the construction of the dry cell. Can you point me to a diagram of the construction? the electronics is way above my head .

  11. Hey Dave,

    I’m glad it’s working out for you. I thought I mentioned the heat sink, but at least you figured it out. If you’re mounting the rectifier in a car, you could mount to the body of the car or truck for a heat sink by just tapping a hole to #8-32 and use a 1″ sheet metal screw through the center of the rectifier.. For testing purposes, I use all metal electrical J-boxes to mount in, all my electronics on stand-offs and use 4 square metal boxes for heat sinks. Electical junk is pretty cheap at Lowe’s or Home Depot.

    In regards to cooling the electronics, you can buy old power supply fans at most flea markets for next to nothing. In fact, you can buy a lot of useful junk for your projects at the flea market. Another thing I do is rape old computers for fans, power supply parts and so on. These types of things I never pay for, or pay very little.

    As for the PWM, the MaxxTronic devices clearly come with paperwork that state PULSE WITH MODULATION and the purpose for them is DC MOTOR CONTROL. Dave, you have one, read the paperwork.

    Alrighty, I’ve been really busy with work lately. I know, highly unusual during this economic smackdown, but my line of work is always high demand so I’ve been lucky. I have a stack of new diagrams and instructional material that I’ll post as soon as I get more time.

  12. ok, ok, modulator – modulation
    modulation is the process of varying a periodic waveform,
    A device that performs modulation is known as a modulator,
    Personally I don’t care what its initials stand for (PWM), I only care that it works as nine_dots said it would.

  13. Where did Nine_Dots go? It seems that this blog and others around the net have dried up. Maybe because of the LOWER fuel prices, people have stopped testing these HHO things.

  14. I’m not sure ???
    But I do know I have a bone to pick with him about the way he says to put the pwm and parts together.
    After following his directions, the pwm did work, for a short time. I rebuilt it once already, and its bridge is blown again. And not once did it go over 25 amps the second time, until after I hooked it up without it, and then I pushed it to 45a without a problem.
    Hopefully, from few members that are working on a PWM for us, we will have some duplicate able results for everyone shortly.
    And a new type of cell that can be replicated very cheaply.
    These members are working together, and have agreed to release the info here as it becomes available, and has been duplicated sucessfully.

  15. First sorry my english.
    PWM , Pulsed Width Modulation. yes it is necessary. If you have good pulsed step up modulation, you can produce HHO gas more faster. higher voltage can produce more hho gas faster and require low amperas.
    you can make it yourself If you need just step down regulator:
    It works very good. i tested it.

    i’m not agreed Baking soda NaCO3 makes trouble to engine and also make more other gas. Na is heavy metal than water. sample: salty water’s salt never disappear even become dry when it is boiling. salt leave after water disappear(i mean vapor the water). it never vapor. Na leaves in HHO generator. You can use NaOH. It is better than NaCO3. Can produce more gas faster. We use NaOH for car battery. NaOH require little for generator. I tested it 2002. coz HHO generator published on old russian magazine, maybe 30 years ago. it was working fine. also i tested Nickel alloy metal sheet for HHO generator. it is working fine.

  16. here is PWM for HHO generator

    • why dont you put a link where you dont have to sign up just to get it? puts me off in a hurry, I despise spam and junk email.
      might be a good item or site, but these days you dont want to sign up on every site there is.

  17. Well PWM or Pulse Width Modulation is where the amount of “on” time is regulated; through the duration of the power wave needed for the load… Ex. If you wanted a 25% output you would produce a PWM equal to 25% of the total output! This is the % or area of the power wave form, it may be square or modified into a gradual modulated sine wave…

    Having worked in the power industry; am familiar with the operation and design of PWM and power outputs… Working on a line of HHO projects but will help you as needs be!

    • Kerminator,
      could you call me please, want to talk about the PWM and the load issues you mention. 720-480-4045 MST
      Thanks Pat

      • Sorry did not get back sooner, do not check this site often…

        You ask about PWM… What specifically are you looking for?

        Called your fon got voice mail…

        leave a question or reply…

  18. […] Here’s the Parts list: thanks to Nine_Dots For the capacitor use any of these 1 – 1000uf 50v (Radio Shack – $2.59) or 1 – 708uf to 850uf 125VAC to 165VAC (take it off an old motor control if you have access) or (You can rape this from an old ATX power supply) 680uf 200v 1- For the PWM, use one of the 30a […] View full post on HHO Fuel […]

    • All well and good; but experience has shown that two of the main things that ” wear out ” or age in electronic circuits; are Capacitors, especially the DC Electrolytic and any Battery!

      So you may want to be selective with which Cap you borrow from an old piece of electronic equipment! just a word of wisdom! The shelf life on most Electrolytic Caps is from 6 to 10 years, depending upon the operating temp, and the duty cycle of the circuit in which it is used!

  19. car parts these days have increased in prices but there are some online car parts seller that have cheap prices :`,

  20. can i make a pwm and effi from scraped computor parts and used sercut boards

  21. Yes, you can scrounge used parts, some items like resistors, fuses, and many semiconductors will work well; as long as they have not been over heated!
    Electrolytic (mainly DC) age out in about five years, so it may be wise to purchase new…
    What schematic are you using for the PWM?

    There are several PWM units you can purchase for $50 to $100; plus they give some guarantee that it works…

  22. Can you use a 1000W inverter 12V DC to 110V mod.sine Wave together with a PWM to increase the pulsed Voltage ?

  23. Plz if u attach a link of full schematic diagram of whole hho generator i will be very glad …..

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