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.
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DC-DC Converter Schematic
MC34063 Datasheet from ON Semiconductor
MC34063 Datasheet from ST
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All Photos Are Clicable
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31 comments
4 pings
Markos says:
July 3, 2011 at 11:17 am (UTC -7)
Great work, once again. You should sell these. I would buy one.
admin says:
July 3, 2011 at 2:57 pm (UTC -7)
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)
Brad says:
August 29, 2011 at 8:43 pm (UTC -7)
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.
admin says:
August 31, 2011 at 2:01 pm (UTC -7)
Sure thing! Here you go:
http://jumperone.com/doc/pcbs/fumes_extractor.zip
It’s Eagle project files.
Brad says:
September 6, 2011 at 3:39 am (UTC -7)
Thanks!
Donation Your way for that. Keep up the Videos.
admin says:
September 6, 2011 at 4:49 am (UTC -7)
Thanks a lot!
Iuri~ says:
July 3, 2011 at 2:26 pm (UTC -7)
really nice! keep up the good work!
admin says:
July 3, 2011 at 2:51 pm (UTC -7)
Thanks! Although I think this video is kind of boring. Next one should be much more interesting.
Michael J. says:
July 5, 2011 at 7:34 am (UTC -7)
How much trouble would it be to integrate a filter into the unit?
admin says:
July 5, 2011 at 7:47 am (UTC -7)
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.
oakkar7 says:
July 5, 2011 at 9:12 am (UTC -7)
How long these batteries can run?
adding a rechargeable function is also a good idea.
admin says:
July 5, 2011 at 10:34 am (UTC -7)
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.
Mike says:
July 5, 2011 at 11:36 am (UTC -7)
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.
admin says:
July 5, 2011 at 11:49 am (UTC -7)
Yeah, you right! I just used more common name, that everyone familiar with.
oakkar7 says:
July 5, 2011 at 8:26 pm (UTC -7)
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?
admin says:
July 6, 2011 at 5:57 pm (UTC -7)
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?
Geoff Dudgeon says:
July 5, 2011 at 1:16 pm (UTC -7)
Please Let me know if you make a kit; I’d definitely be interested in buying one.
admin says:
July 5, 2011 at 1:24 pm (UTC -7)
Ok, will do! )
Helgi says:
July 6, 2011 at 10:24 am (UTC -7)
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.
admin says:
July 6, 2011 at 5:48 pm (UTC -7)
Listen again
In video I said 1.6V for non rechargeable batteries (maximum voltage for new 1.5V batteries)
Jim says:
September 9, 2011 at 8:35 pm (UTC -7)
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
admin says:
September 9, 2011 at 10:05 pm (UTC -7)
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:
http://www.eevblog.com/2011/07/18/eevblog-186-soldering-tutorial-part-3-surface-mount/
SMD soldering tutorial from Dave.
George says:
September 16, 2011 at 6:16 pm (UTC -7)
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.
wardy says:
October 5, 2011 at 12:08 pm (UTC -7)
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.
Fozzyvis says:
October 6, 2011 at 11:29 am (UTC -7)
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)…
Fozzyvis says:
October 6, 2011 at 1:27 pm (UTC -7)
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…
thanks!
admin says:
October 9, 2011 at 9:13 am (UTC -7)
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.
http://www.eevblog.com/2010/09/10/eevblog-110-lets-design-a-dc-to-dc-switchmode-converter/
About li-pol charger that you built. It’s like a clock building, really time consuming stuff..
Brad Dangerfield says:
October 8, 2011 at 1:28 am (UTC -7)
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
admin says:
October 9, 2011 at 9:42 am (UTC -7)
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!
David Richards says:
January 1, 2013 at 4:19 pm (UTC -7)
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.
Ted Mieske says:
March 24, 2013 at 2:35 pm (UTC -7)
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.
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