Portable Fume Extractor / Fan

I’ve got a new tool on my workbench – portable fume extractor. It’s 92mm fan that works from 4 AA batteries and has a variable speed. Mobility is a really good thing, especially when you’ve got a tons of equipment and cables on a bench you can drown in.


DC-DC Converter Schematic

MC34063 Datasheet from ON Semiconductor

MC34063 Datasheet from ST


All Photos Are Clicable


4 pings

  1. Markos says:

    Great work, once again. You should sell these. I would buy one.

    1. admin says:

      I’m not planning on selling this but actually it could be a pretty nice kit if to replace mc34063 with something more efficient and make mounting brackets for fan (so people don’t need to glue board to fan)

      1. Brad says:

        any chance of posting your pcb files? i would like to try duplicating one of these with your board if you wouldn’t mind! if not thats okay too.

        1. admin says:

          Sure thing! Here you go:
          It’s Eagle project files.

          1. Brad says:


            Donation Your way for that. Keep up the Videos.

          2. admin says:

            Thanks a lot!

  2. Iuri~ says:

    really nice! keep up the good work!

  3. admin says:

    Thanks! Although I think this video is kind of boring. Next one should be much more interesting.

  4. Michael J. says:

    How much trouble would it be to integrate a filter into the unit?

    1. admin says:

      It shouldn’t be too much of a problem, but the question is: will productivity of such a fan would be enough? Although it is possible to overclock a fan a little bit with higher voltage.

  5. oakkar7 says:

    How long these batteries can run?
    adding a rechargeable function is also a good idea.

    1. admin says:

      I haven’t done such measurements yet, but I guess It should be about 8 or even more hours.
      + It’s a bad thing that I didn’t put a DC input to the board. (to power fan while batteries are charging).

      And about built-in charger – It’s easier to do with Li-ion batteries. You could put an 18650 Li-ion battery and some charger IC.

  6. Mike says:

    It isn’t technicaly a fume extractor- in that it doesn’t filer or extract anything. It’s a fume disperser. It’s simply a fan that blows or sucks the fumes away from a point.

    I like it and think it is a good project and might be nice to have, but I think one should realize what it is.

    1. admin says:

      Yeah, you right! I just used more common name, that everyone familiar with.

    2. oakkar7 says:

      really, I formerly used a small 12V DC computer power supply fan as exhausted fan (seem this name is more suitable than fume extractor).

      If so, what type of materiel (easily find) can be used for carbon filter. any idea?

      1. admin says:

        I guess Home Depot (or similar) should carry something like activated carbon (charcoal) filters for air filtering. But would it be enough productivity of such a fan to pump air through carbon filter?

  7. Geoff Dudgeon says:

    Please Let me know if you make a kit; I’d definitely be interested in buying one.

    1. admin says:

      Ok, will do! )

  8. Helgi says:

    I’m interested in where you find 1.6 volt rechargeable AA batteries. My rechargeable AA batteries are 1.2 V each, which would give me 4.8 V. for 4 of them.

    1. admin says:

      Listen again ;) In video I said 1.6V for non rechargeable batteries (maximum voltage for new 1.5V batteries)

  9. Jim says:

    Hi, i want to give this project a go, thanks for the eagle files. I am a electronics newbie and never worked with smd. what are the values of r3,4,5. Thanks for the info

    1. admin says:

      Working with SMD is really easy. It’s even easier than working with through-hole components, because you don’t need to drill any holes.
      R3 = R4 = 1 ohm
      R5 = 82 ohms(100 will do just fine too)
      But these values is present on the schematic. Maybe you just need to switch “values” layer on?!

      Just in case if you need some pointers on smd soldering:
      SMD soldering tutorial from Dave.

  10. George says:

    any way you can make one of this for me. i will pay of course. I started to get into electronics but got to busy to pursue it. i have lots of parts i bought and never used them. i can donate them to you.

  11. wardy says:

    Another great video. I like your willingness to put such a huge amount of thought into such a simple problem and then make it available for everyone. That’s totally awesome.

  12. Fozzyvis says:

    Found this when browsing through your site (after reading a recent HAD article).
    Really like this, I’m thinking about making this for use with some spare Li-Po I have lying around, so I can use the charger I build based on this nice instructable: http://www.instructables.com/id/USB-Li-ion-battery-charger/. Took a lot of cursing to get this done, so would be nice to actually have a use for it.

    If I ever get as far as doing this, I’ll certainly donate (ofcourse)…

    1. Fozzyvis says:

      While looking at the schematics and comparing with the datasheet from ON and TI, I’m wondering where you get the 33uH value from? Why not the 170uH that’s mentioned in the datasheet?
      And why R3 and R4 parallel with both 1 ohm values instead of 0.22 ohms? Just curious…
      Also, do you have any part numbers/links for the switch, potmeter an inductor used?
      Espacially picking a usable inductor for smps applications isn’t my cup of tea yet…


      1. admin says:

        Examples in those datasheets are for specific voltages and currents. When using mc34063 you need to use formulas provided in the datasheet to calculate values for inductor, capacitor, and resistors.


        About li-pol charger that you built. It’s like a clock building, really time consuming stuff..

  13. Brad Dangerfield says:

    Phil! I just wanted you to know that i completed my version based off the eagle files

    you gave me. though, my verison is radically different, the only thing i ended up using

    were the input pads, everything else is quite different.

    It turned out pretty sweet though, i’ll email you some pics! I based mine around the

    Texas Instruments TPS61093 Boost converter. Though, i don’t think very many people

    could relilably build with these unless you have some good equipment. Its such a handy

    tool though, i love it!! It outputs variable from about 8-17V and input is ~2-6V

    1. admin says:

      Nice one! TPS61093 is much better for this type of applications, because of higher efficiency and smaller inductor size needed.
      Yeah, you right, one should have at least hot air gun to solder those. Although it is possible to solder chips in such a small packages with soldering iron alone, but it could be really hard.
      And 17V is much better than 13V that mine can supply to the fan. Sometimes it’s not enough.
      I would really like to see the pictures!

  14. David Richards says:

    Hi, Any chance I could have the eagle file, I’ve been meaning to make a fan for a while but never get around to it for the reasons you said about the extra wires messing up your bench or kitchen table as in my case. but I saw this video and thought it’s a good project to do in it’s self. So to save me time in designing the eagle schematic myself could you please send it to me and tell me what file I need to put it in to make it work. Thank you David.

  15. Ted Mieske says:

    I just looked at your ‘Fume Extractor Fan’, using Firefox 20 with Foxit .PDF
    reader installed as a plugin to Firefox, and all I can see is PADS,
    NO schematic. Haven’t had that problem with other programs that are
    supplied in .PDF form.

    Looks like your using Eagle. I have seen this problem even with my own
    schematics on my web site. So I went to ExpressPCB & Schematic, and
    my problem went away.

    Thought you should know.

  16. Michael says:

    Hi, I know this post is old but I plan to make this and I was wondering about the SMD capacitor values. Could C1, 300 pF, be 330pF ? Also, I presume 0.1 for C2 and C3 is 0.1uF ?

  17. Moncler Doudoune Homme says:

    Veste Moncler Pas Cher
    Moncler Doudoune Homme http://www.mboards.eu/fr-moncler

  18. Veste Homme Moncler says:

    Veste Moncler Pas Cher
    Veste Homme Moncler http://www.thermaeeuropae.eu/fr-moncler

  19. mark says:

    I made my own fume extractor using an old nvidea graphics card. 12 volts but managed to purchase 4x 3.7 AA size batteries from ebay that puts the voltage to 15V+ . works great with a variable amp, using LM317T. but when I switched to variable voltage regulator, the fan speed is the same. I may be doing something wrong with my circuit but I will try more stuff to it.
    all credits are yours bud. thanks.

  20. bestcrossbowreviews2014.net says:

    Good blog you’ve got here.. It’s hard to find quality writing like
    yours these days. I seriously appreciate people like you!
    Take care!!

  21. home theater receiver reviews 2014 says:

    Undeniably believe that which you said. Your favorite justification seemed to be on the web the easiest thing to be aware of.
    I say to you, I definitely get annoyed while people think about worries that they
    just don’t know about. You managed to hit the nail upon the top and defined out the whole thing without having side-effects ,
    people could take a signal. Will probably be back to get more.

  22. hobbyman says:

    This project is nice and I want to make it but I have some questions. First what is the value of c5, 0.1pf isn’t it? And what is J1.

  1. Computer Fan Fume Extractor | LED World says:

    [...] DIY power supply a couple weeks ago, has a new project: I’ve got a new tool on my workbench – portable fume extractor. It’s 92mm fan that works from 4 AA batteries and has a variable speed. Mobility is a really good [...]

  2. Tech Curl - Computer Fan Fume Extractor says:

    [...] DIY power supply a couple weeks ago, has a new project: I’ve got a new tool on my workbench – portable fume extractor. It’s 92mm fan that works from 4 AA batteries and has a variable speed. Mobility is a really good [...]

  3. Electronics-Lab.com Blog » Blog Archive » Portable Fume Extractor / Fan says:

    [...] Fume Extractor / Fan – [Link] Tags: extractor, fan, fume Filed in Motor | 4 views No Comments [...]

  4. Projectos extra | CBDuino says:

    [...] tenho em mente construir eu mesmo uma coisa destas. Não quer dizer que vá ser igual a 100%, mas vai ser deste tipo. Tenho algumas ideias [...]

Leave a Reply

Your email address will not be published.

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>