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Computer Fan....will it work?

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#1 cadfour

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Posted 24 April 2014 - 04:42 PM

I just grabbed a computer case fan out of a dead computer (12v 1.5A) 4" to screw holes on a diagonal, it might fit my 8" Skyview Pro but I haven't gotten home yet to check. Anyway, it has 3 wires, red, black, and yellow. I will assume the red and black are the positive and negative wires. Is the yellow a ground wire?? Are my assumptions wrong and if so, how do they connect to a battery power source?

I would like to try and connect a fan to my scope to reduce cool down time.

Thanks.

#2 rlmxracer

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Posted 24 April 2014 - 05:28 PM

Red= +
Blk= -
Yel= Fan speed (unused)
It should be similar to the fan that the GSO dobs come with.

#3 coopman

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Posted 24 April 2014 - 06:12 PM

I'm using a PC fan with a Radio Shack battery holder that holds 8 AA batteries. Works great.

#4 Billytk

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Posted 24 April 2014 - 06:13 PM

Orion does sell fans for their scopes and they are fairly cheap.

#5 azure1961p

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Posted 24 April 2014 - 06:23 PM

It should work great - been there doin that. Do not however run it at 12 volts - way overkill, noisy and shaky. Six volts and its a charmer.

Pete

#6 cadfour

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Posted 24 April 2014 - 06:24 PM

Yes i saw Orion's fan, but if I can get one working for free why not try it. If it fails, I can always fall back to the Orion fan.

ok..so now about the batteries. Is there a certain amount I should use...3?, 6?, 8? D cells? I sort of have to figure out a holder for them too....any ideas?

Oh, and thanks for the helpful replies.

#7 City Kid

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Posted 24 April 2014 - 07:43 PM

I use a computer fan on my Orion XT10. I started off with a 9v battery using a holder from Radio Shack. I decided that the 9v batteries were going dead too fast so I switched to a AA holder from Radio Shack that holds 8 AA batteries. Both work fine but it ended up being cheaper for me to go the AA route so that's what I do now.

#8 azure1961p

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Posted 24 April 2014 - 09:58 PM

I use a boxy 6v flashlight battery that has the spring could coming out the top. Works great a really and lasts quite a while.


Pete

#9 Mirzam

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Posted 25 April 2014 - 06:44 AM

I use a 7 AH gel cell with my fans and run them through a converter to reduce the voltage and speed if necessary. The fans will run for several multi-hour sessions (at least) before the cell needs recharging.

JimC






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