Help - project for a electrical newbie. - Fan , Switch, Battery
Help - project for a electrical newbie. - Fan , Switch, Battery
(OP)
Hello,
This is a little project that I'm working on and would like some input from experts :)
Here is a diagram of what I'm trying to do.
http://3volution.org/project/Diagram1.gif
Basically, I want to hook up a small computer fan to a button/toggle switch and a 9volt battery.
I know it works. I have tested it out and seems to do what I want, But I wanted to know if It could be done better or if I'm missing anything important. Is it normal for the battery to heat up so much.
I don't know much about this stuff so go easy on me. Thanks
This is a little project that I'm working on and would like some input from experts :)
Here is a diagram of what I'm trying to do.
http://3volution.org/project/Diagram1.gif
Basically, I want to hook up a small computer fan to a button/toggle switch and a 9volt battery.
I know it works. I have tested it out and seems to do what I want, But I wanted to know if It could be done better or if I'm missing anything important. Is it normal for the battery to heat up so much.
I don't know much about this stuff so go easy on me. Thanks





RE: Help - project for a electrical newbie. - Fan , Switch, Battery
The reason I ask is that there appears to be an extra wire connected to the switch. It might be shorting out the battery when the button is not On.
Need more info to be sure (switch pin-out).
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
The only reason to run the - to the switch would be if there was a lamp on it, but IMHO you will not want to waste the limited battery capacity you have on a lamp.
The battery may also heat up because they are rated for Amp output, not just voltage. If you are using a small 9V battery such as found in a multimeter or smake detector, they are not designed to put out a lot of current for very long.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
Yes the switch has 2 led lights on it.
one for on ... one for off.
I'm actually trying to make this fit in a Paintball mask to combat fogging of my glasses.
I got it all together last night .. works pretty good. Except the heating issue. But I would only run it for short periods of time to de-fog the mask.
Anyone have any ideas of how to make it better?
Would resistors/capacitors or any other items make this work better?
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
not sure about the amp ratings on the fan.
I don't think its really heating up till the fan is on.
I'll try to post pics of what I've made tonight.
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
http
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
Don't bother... The two fans you show are both WAYYYYY to large a load for a 9V battery. You should not ask a 9V battery for more than about 10mA. The low current fan of the two you show in that link draws 70mA!! This will heat the battery up and kill it in minutes....
Something that would work A LOT better would be a battery pack holder like this item in Digikey. They also come with just solder lugs and with snaps just like the top of a nine volt battery.
http:/
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
I guess I could run a wire from a pocket up to the mask.
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
Thanks !!
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
That sounded a bit low to me so I checked. The Duracell datasheets for 9V alkalines (Ultra and CopperTop) show that the life should be several hours (five-ish) at 70mA current draw. Although they don't clearly provide a numerical limit, the life curves imply that the upper current rating is much, much higher than 10mA.
A 6-cell AA-cell pack would be much better and cheaper to boot.
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
http://www.duracell.com/oem/ProductData/
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
Toms Yes! 6 AA would serve you a heck of a lot better. They would provide you with about 10Hrs of life if you use the .07Amp fan in your list. You can also tape the pack to your helmet, that wouldn't be too heavy.
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
"Venditori de oleum-vipera non vigere excordis populi"
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
like you could even arrange the defrosting strips in some sort of crosshair pattern to improve your marksmanship.
Regards,
Afterhrs
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
Regards,
afterhrs
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
There are fans that only require 0.20W (40mA at 5V) instead of the 0.84W fan you proposed. Three AA batteries, even AAA, might last long enough for you. A few links:
http://www.sunonusa.com/pdf/2004dcfan2.pdf
http://www.nidec.com/ta100dc/ta100dc.htm
ht
ko (www.ecooling.biz)
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
Thinking a backpack and a deep-cycle marine battery might work best for me ;)
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
TTFN
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
"Venditori de oleum-vipera non vigere excordis populi"
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
In this application, I'd suggest using AAAs in a readily available battery holder. 9V bats are really for low current applications. AAAs you can run at up to an AMP (1000ma) though best discharge curves are under 250ma.
Andy
Andy Somers
Myndex Technologies Inc.
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
http://www.realgoods.com/shop/shop2.cfm/dp/210
regards
Pete
(TurboXS)
RE: Help - project for a electrical newbie. - Fan , Switch, Battery
regards
Pete
(TurboXS)