Basic and Cheap Fume Extractor  - Page 1
Forum section: electronics / projects

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: January 02, 2013, 02:21:01 am
content: My plan is to build a cheap fume extractor .... I am using a 4 wire AFC1212DE-PWM fan which I am going to mount to a dollar store camera tripod mount ... The power will be from a laptop power brick which is 12v / 4.16a ... The power will come from the brick into another project box which will contain my pwm circuit and the 12v to 5v circuit which will come out of a cigarette lighter phone charger ... I am not sure on the pwm circuit yet but I am working on it .... So whats your thoughts on the idea I am working on??ThanksJay

author: SeanB
author_rank: Super Contributor
timestamp: January 02, 2013, 05:33:19 am
content: You will find a 2 speed fan control will be needed only, low speed when not soldering ( or off) and full speed when working. Thus all you need is a 555 running at 1kHz to provide the 50% slow running.

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: January 05, 2013, 07:06:51 pm
content: Quote from: SeanB on January 02, 2013, 05:33:19 amThanks for the info but with the RPM 3900 RPM and the Air Flow 192.96CFM being what they are... I would like some control over it and be able to adjust he fan speed ..Here is the circuit I am using in order to power my 5v pwmCt=189 pFIpk=1000 mARsc=0.3 OhmLmin=28 uHCo=1250 uFR1=1k R2=3k (5V)What do you think of my specs???Here the link for the modelhttp://www.nomad.ee/micros/mc34063a/index.shtmlAlso here is the 5v pwmComponents555 Timer IC (Integrated Circuit)Capacitors: C1 0.01 ?F; C2 680 pF; C3 10 ?F; C4 0.1 ?FResistors: R1 1kPotentiometers: P1 100kDiodes: D1 & D2 1N4148

author: somlioy
author_rank: Regular Contributor
timestamp: January 05, 2013, 07:19:12 pm
content: This is what I'm using. Just blowing the fumes away.The fan is very silent. Cheap and silent.

author: Rick
author_rank: Frequent Contributor
timestamp: January 05, 2013, 07:44:34 pm
content: That looks nice. Place the carbon filter at the back, from where it blows the air outwards, then it absorbs the fumes better.

author: SLJ
author_rank: Frequent Contributor
timestamp: January 05, 2013, 07:55:21 pm
content: These have been discussed in detail here before:https://www.eevblog.com/forum/reviews/cheap-smoke-absorber/I used an old computer power supply 12 VDC fan with part of the original case and just vary the speed by powering it with one of my existing bench power supplies. Can't get much cheaper than that.I also recently found one of these EDSYN units cheap ($12) on eBay.

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: January 06, 2013, 12:21:29 pm
content: Sorry I building this as a project build not a show and tell as the other thread but just wanted some opinions on the build and to make sure this will even work with the fan I am using....

author: olivil
author_rank: Newbie
timestamp: January 07, 2013, 04:40:43 am
content: I have aWeller WSA350and while it works and neutralizes the fumes, you have to be pretty close to it (no more than 20-25cm away).It is simply, I believe, a 120mm fan on a nice looking stand with a carbon filter holder and a visor.The Weller branded one retails around 50$ street price if I recall correctly, but I remember finding an identical off-brand one in the low 30s$.My point is, if you simply mount a good 120mm fan with a clip or holder for a carbon filter and you solder close to it, well I assume it would work as good as the Weller I have!

author: Rick
author_rank: Frequent Contributor
timestamp: January 07, 2013, 02:36:19 pm
content: Quote from: olivil on January 07, 2013, 04:40:43 amEspecially if you place the carbon filter behind:)I have tested and it turns out it works better that way.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 07, 2013, 02:43:58 pm
content: Kipkay made a video about a portable fume extractor with a filter (he created the project and stored it in an Altoids can. Basic circuit few components and easy to make you can add a pot to adjust the speedVideo ---->Tell me what you thinkThank you