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Old 18 May 2016, 04:28   #1
powrslave
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best way to run a .85v fan

I want to hook up a .85v fan to a1200.

Is there a way to do this safely or should I just stick to an external ac adapter?
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Old 18 May 2016, 13:43   #2
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What sort of fan? 0.85V??? Tell us more about what you're trying to do. There probably is a way to do it - I've run fans in A1200s before, but we need more specifics.
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Old 18 May 2016, 14:08   #3
ptyerman
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By sounds of it, he means a .85ma or 0.85A. These are either 5v or 12v, you could run a .85ma fan off the floppy power port, 0.85A is to heavy for that really and you would need to solder a power take off to the rear of the Amiga's power socket, or use a external power adaptor as you said.
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Old 18 May 2016, 16:15   #4
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Yeah, that's what it sounds like alright. .85mA is still far too small so I would expect it's 0.85A, or 850mA. That is a bit much for the floppy connector alright, and might even be a bit much for an A1200 PSU, especially if there's something else in there generating enough heat to require active cooling like a hot hard drive or accelerator.

If the PSU is replaced by an AT or ATX type, that should have additional drive outputs that would be ideal for driving a fan like that.
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Old 18 May 2016, 16:15   #5
hooverphonique
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0.85mA for a fan sounds unrealistically low, though.. On the other hand, a 0.85A fan is quite a big one. 0.85V fan doesn't sound right, either :-)
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Old 18 May 2016, 19:26   #6
powrslave
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Quote:
Originally Posted by hooverphonique View Post
0.85mA for a fan sounds unrealistically low, though.. On the other hand, a 0.85A fan is quite a big one. 0.85V fan doesn't sound right, either :-)
Sorry .85A 25mm for my AGA mkII

Well I have something like this

http://www.ebay.ca/itm/JMC-Datech-Br...4AAOSw3mpXL22x

but I'm open to spending a little to obtain something that I can run inside the a1200 off of something, anything!

http://www.newegg.com/Product/Produc...82E16835119098

http://www.evercool.com.tw/categorie...imges/2510.pdf

http://www.ebay.ca/itm/DC-5V-2-Pin-2...wAAOSwk1JWc4Z7

Last edited by powrslave; 18 May 2016 at 20:04.
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Old 18 May 2016, 20:38   #7
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Yes, if you can find something around 250mA or less you should be able to run it off the internal floppy power connector. Just bear in mind that Amigas don't tend to follow the colour convention used by PCs for power leads (yellow=12V, red=5V) so make sure you check the pinout carefully, ideally with a multimeter. But I've run small fans from both the 5V and 12V floppy power supply without problems.

What sort of PSU are you using?
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Old 18 May 2016, 21:08   #8
powrslave
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Quote:
Originally Posted by Daedalus View Post

What sort of PSU are you using?
Stock black escom
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Old 19 May 2016, 11:05   #9
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Yeah, at least one of the fans you linked to ran on 200mA or less, so that's probably the way to go. You're probably already close to the limit of what that PSU can do, so try to get as low powered a fan as you can.
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