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Step 12: Final Assembly

The reason I dont bother with any fuses in the live leg of the AC input, is that you can get badly shocked from the HV side of things and the fuse is not even going to blow, let alone protect you.

I noticed that the cap array has a tendency to rotate inside the pvc tube so I glued some locating sections inside to stop it from doing so.

The important thing to remember is to discharge the unit if you want to work on it again, short the neutral grid to the HV side via the 10Meg resistors to avoid stressing any components.

DON'T FORGET to short out the 220v ac input once you have pulled it out of the wall socket, the caps still carry enough of a charge to wake you up rather rudely.

My future TO DO list might include:
  • upgrading the HV pins in the full wave version to CF tips
  • change the neutral wired grid in the half wave version to proper earth/ground grid, which just means I'll need a 3 core cable for the input instead of the present twin-flex.

The last image is a view of the upgraded CF tip array after a lot of use so its rather dusty in there.
Nice instructable. I made one of these some 30 years ago. My mum wasn't that happy about it, because the high voltage charges fine dust particles and they are attracted by more or less grounded surfaces like walls and even windows ;-) If you direct the ion flow trough a grounded tube, you have a electrostatic air cleaner. (you can have a thin wire insulated in the center of the tube and connect the high voltage there. As it's done in laser printers.) You can also make a ion propulsion propeller...
How can I make electrostatic air cleaner by using this?
<p>https://www.youtube.com/watch?v=2uD9wtq29h8</p>
<p>Hi, if you measure 6 kV on the carbon tips, does that mean it produces positive ions? I measured on some Chinese ionizers and I measured <strong>-6</strong> kV... Thanks.</p>
<p>You will only get a positive output if your diodes are the wrong way around.</p><p>Their polarity must be as in step 1.</p><p>Positive ions will do more harm than good.</p>
Hi,<br><br>Ok, thanks for your reply. Its an industrial custom made one we are testing at work, but i guess our electronics specialist was sleeping or something ?. Its for reducing fine dust in big spaces.
<p>what if i reverse the polarity of the high wave circuit.</p>
<p>Positive ions will do more harm than good.</p>
<p>thank u sir</p>
<p>thank u sir</p>
<p>thank u sir</p>
<p>thank u sir</p>
<p>thank u sir</p>
<p>thank u sir</p>
<p>thank u sir</p>
<p>how to check whether my voltage multiplier circuit is working or not as there is no blue glow on the needle......</p>
<p>Read the comments, a lot of folk have added valuable contributions to further this sphere of knowledge.</p><p>Build a diy Electroscope, comment to SARMAC lower down.</p>
<p>Great educational stuf from Dave<br><br><iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/ep3D_LC2UzU" width="500"></iframe><br><br><br></p>
<p>Can I use Ceramic disk capacitors? .01mfd 1KV? unable to source PP ones.</p>
<p>No experience with them, in theory they should work.</p><p>However they are physically much smaller and might fail. They seem to be more signal orientated compared to the ones I used, designed for mains power applications.</p>
Would this setup work with 110v input? If not, what would I need to change/add? Thank you.
<p>Sure would, output voltage might be a bit low though, but you could always add 2 or 3 more stages to compensate. </p>
<p>Thank you :)</p>
What area cover the full wave ionizer
<p>Dear Sir,</p><p>I have tried constructing a ionizer 4 to 5 times. But I could not get the result.</p><p>Now I have constructed the full wave ionizer as per your instructions. This time, I got the result. the voltage at the second capacitor itself has crossed 800v.If we bring the line tester near the tip of the pin, even without touching the pin, the light in the tester is glowing. when I move the tester even closer, blue light is coming between the pin tip and tester tip. Does this mean the circuit is working? </p><p>But I could not smell anything. is there any way to test whether this ionizer is working or not?</p><blockquote>Thanks again for giving valuable instructions. <strong><em>Kindly let me know how to test whether negative ions are coming out or not?</em></strong></blockquote><p>Thanks in advance,</p><p>CH M S SARMA</p>
<p>If you can see the tips glowing in the dark and all the diodes are correctly orientated then only neg ions can be present at the output spike/pins.</p>
<p>Dear Sir,</p><p>I have a small doubt. will the tips glow themselves? or we have to bring the tester near the tips? If I bring the tester near the tip, I can see the blue spark between the pin and the tester. and when we bring the tester near the tips, even without touching the pin, the light in the tester is glowing. I have checked the orientation of the diodes and everything is ok. </p>
<blockquote>I can see the blue spark between the pin and the tester. and when we <br>bring the tester near the tips, even without touching the pin, the light <br> in the tester is glowing. I have checked the orientation of the diodes <br>and everything is ok.</blockquote><p>You've answered your original question, its working.<br></p>
<p>I have one more question Sir. suppose we give the central pin to neutral and both the other ends to Line and we will reduce the Capacitors to half. will it give the required result? can we use alpins at the end as emitter?</p><p>Thanks,</p><p>CH M S SARMA</p>
<p>You could try other configs to see which gives best result, anything conductive and sharp can be used for emitter</p>
<p><strong>IT WORKED</strong>.. I have made a circuit of 6 capacitors in a row and given both ends to line and center one to neutral. I can see the blue spark when I bring the line tester near the pin. Also when I brought the tester near the pin from 1cm distance, the light in the tester is glowing. Any problem will have in this design? or I can use this?</p><p>Thanks,</p><p>SARMA</p>
<p>It should be fine, it might just be a lower voltage.</p><p>Leave it on in a vacant room for 1hr or 2 and see if theres a freshy electric kind of smell when you come back in.</p>
<p>Dear Sir,</p><p>Will there by any noticeable difference between full wave and half wave ionizer. can we make this circuit without a Fan?</p><p>Regards,</p><p>CH M S SARMA</p>
<p>Nothing you'd notice, fan not needed.</p>
<p>Dear Sir,</p><p>I have purchased the capacitors and made the half wave ionizer. If I bring the line tester 1 inch near the tip/resistance, the big blue spark is coming. </p><p>Then I checked the capacitors. they are .33nf. I hope the capacitance will not effect the output voltage. Further, when I checked the crockfit Walton voltage calculator, in 14 stages - input V 220AC - capacitance - any - load current .1 mA, the output Vmax is 9kV. Don't you think that this value is very high for generating the negative ions? Interestingly, the output voltage is not changing with capacitance. </p><p>I am not able to understand whether the circuit will generate negative ions or not.</p><p>Hope you will clarify my doubt.</p><p>Regards,</p><p>CH M S SARMA</p>
<p>The output voltage is dependant on the number of stages, not the cap values.</p><p>If your applied voltage is on the negative side of the diode, a negative voltage will be present at the output pins, you can chisel that into rock, right next to death and taxes.</p><p>When the neg voltage at the output pins becomes high enough, negative ions will depart into the surrounding air from any sharp points, low voltage = few ions, high voltage = many ions.</p><p>The only way for you to erase doubt/confusion is through knowledge. </p><p>Experiments will allow you to observe static electricty fundamentals to gain the required knowledge, with that in mind build a simple electroscope to determine that your device emits ions. </p><p>Then precharge the electroscope with a positive static charge, the foils will repel each other, now direct your ioniser to the electroscope, a negative charge from your device will cause the foils to drop/close.</p>
<p>Hey Peterrc</p><p>I have bought a commerce negative ion generator that is rated for 7.5kv. I was wondering if i could use this to make a ait ionizer. When i run it it can ionizns the air but i dont know how i would set it up to capture dust.</p>
<p>I would use a fan on the end to cycle the air through the device, a ground plate is needed to attract the dust which would otherwise be attracted to the walls, ceiling etc.</p><p>The ground plate doesnt have to be inside the device, it can be a stack of several strips all grounded, just in front of the device output.</p>
<p>To clarify the <a href="http://www.imagesco.com/kits/negative-ion-generator.html" rel="nofollow">negative ion generator</a> (last one down 7.5kv) Is only the generator. The generator has a ground terminal. Could I connect the ground to the fan metal grid and then put the pins facing it just like you did but with out a ton of capacitors. Also would it be a high voltage or low voltage systems. I would like to do the same set up but with out the electronics and just replace it with this. Would that be possible. I am trying to better understand how this works so that i can try and implement this other method.</p><p>Thank you very much.</p><p>Ender</p>
<p>Can any body tell me where is the ground for this generator?</p><p></p>
<p>Yes, its exactly how you've imagined it and 7.5kv is very high voltage so be careful that your fingers dont get too close when its on.</p><p>Those 2 wires would be live and neutral and I'd suggest that you use the earth/green wire to the grid. My little fan grid isn't very effective at removing dust particles which is why I suggested the plate stack, more surface area will attract more dust. If you google <a rel="nofollow">electrostatic cleaner</a>, you can get an idea of a starting point.</p>
<p>I made it but when I connect the input to main AC nothing happend ! I didn't see faint purple corona glow discharge at the needle tip ! after that I connected a flyswatter circuit as input and then it works ! I saw purple glow at needle tip in darkness but its sooo tiny and difficult to see ! ( I used a magnifier lol ) ! I don't know why is the performance so poor ? I should say the ground is connected to nothing ! because we don't have any type of earth connection at home ! what should I do to increase performance ?! should I use an inverter with high frequency square wave to have higher voltage in output ?</p><p>best regards</p>
<p>Connect the center input leg to ground. </p><p>I've traced the domestic wiring in my house and checked in the box where it enters the house, the &quot;neutral&quot; is actually connected to the ground spike.</p><p>So with that in mind, perhaps you could hook up the center connection to neutral and &quot;live&quot; to the 2 outer connections.</p>
<p>Hello petercd and thank you for sharing your experience</p><p>I have a question</p><p>can we build an electrostatic air filter with 2 section ( like these pics ) using this circuit ?</p><p>section 1 charging particles with positive high voltage and section 2 collecting them with negative high voltage plates ! and after collecting we put sharpened pins ! </p><p>it seems it is more effective to collect particles if we first charge them with positive high voltage them attract them with negative plates</p><p>thnx alot</p>
<p>Seems like it might work, but I have no real experience with the way the commercial systems are setup.</p><p>Some folks use a grounded foil nearby the generator to attract the dust, being outside the generator makes it easier and safer to clean.</p>
<p>Thank you very much </p>
<p>I'm trying to fix an ionizer. It just stopped working (i.e., fan runs, but no more ozone odor). Does the plate (3&quot; x10&quot; porcelain) have to be cleaned, and if so, how? Looks like it is soldered in there. I'd appreciate your help! Thanks.</p>

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