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Tiger D
06-19-2008, 03:32 PM
I learned my lesson at Midnight Rodeo. I went through the whole op with my goggles fogged up and envying those with fans on their goggles.
I looked into what it would take to outfit my goggles with one, and decided to go the do-it-yourself route. I found a 4-6V fan, 1 inch square, on e-bay for $5.00 and bought a single AA battery holder and mini switch at Radio Shack for less than $4.00 total. Through playing around with different voltage/battery combinations I found 2 CR2s (3V each) to be the best, and with a little modification to the battery holder they fit in it well. The fan runs at 60 mA at 5V and the CR2s are typically 900-1100 mAH, which will give you quite a bit of defogging time.

Here are the results. It's inexpensive and easy to do.

http://img242.imageshack.us/img242/5956/img1530dy0.jpg

http://img73.imageshack.us/img73/8490/img1531da5.jpg

http://img80.imageshack.us/img80/9427/img1533di5.jpg

otang
06-19-2008, 05:11 PM
One suggestion, if you haven't thought of it already, would be to make the wiring so that it doesn't hang around lose and snag on the branches.

Tiger D
06-19-2008, 06:33 PM
I see your point, Otang. I'd hate to be running around and have them yanked off of my head. I still haven't figured out if I'm going to use elastic bands, sew some type of retainer to the strap, or what. I'll definitely have it figured out before I use them. Thanks.

Mishkan
06-19-2008, 07:00 PM
Did this same exact thing a little while back. Too lazy to take pictures right now but here's some simple improvements:
On the battery compartment: http://www.radioshack.com/product/index.jsp?productId=2062254&cp=&sr=1&origkw=AAA&kw=aaa&parentPage=search
$2 has switch integrated and uses AAA (much cheaper and more common)

Also when you put the fan in make sure to create somewhat of a seal at the top of the goggles, when you leave the holes at the top it tends to create only small circular currents near and around the fan, which really doesn't help much with the rest of the goggles.

Tiger D
06-19-2008, 08:00 PM
Thanks for the hints. This fan needs at least 4V to function. I opted to go with two 3V batteries in one AA package. To go with common AAA or AA batteries I would need to have at least 4 of them. I can get the lithium batteries for a couple of bucks each and they'll last for a very long time.
I already sealed the gap between the fan and goggles with silicone. I can feel the fan pulling the air through the goggles really well.

otang
06-19-2008, 11:33 PM
Good suggestion Mishkan, I'm not sure of the size, but the battery seems too large and the on/off switch seems too small to get to without slowing you down or need assistance from others. Maybe a cap switch like the kind flash lights have.

Tanjiku
06-20-2008, 06:36 PM
Impressive!

Have you tried looking at BatteryPlus (store)?

Just a thought, how about a single cell 3.7V LIPOLY adjacent to the fan? It would be light enough to be mounted on top of your goggles.

That would be the Ultimate Goggles, so to speak!

Cheers to that!

Tiger D
06-20-2008, 10:51 PM
I tried a 3.6V from BatteriesPlus and it wouldn't move the fan. That's when I switched to the double 3Vs.

The small pack in the back of the strap is light and you don't even notice it. Basically it's one AA.

The slide switch on the top of the goggles is really convenient and easy to get to.