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 Post subject: Power supply question
PostPosted: Fri Jan 06, 2012 5:56 pm 
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Phidgetly

Joined: Sun Jun 05, 2011 5:15 am
Posts: 32
Hello,

Forgive what is probably a basic electronics question but ..

To keep my Phidgets cool I'm looking for a way to power a small computer style fan (probably 12v DC and 0.2amp). My options are ..

    A single 5amp, 12v DC supply which is shared between my Phidgets DC Motor and Servo controller boards.
    A 12v DC 2amp power supply which is powering my LED controller.

I worry however that if I share either of these supplies with the fan, they'll fry the fan as they're delivering far too much current.

Any pointers are much appreciated.

cheers
ben


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PostPosted: Mon Jan 09, 2012 8:14 am 
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Human-Cyborg Relations
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Joined: Tue Sep 27, 2011 2:37 pm
Posts: 407
Location: Calgary
The system will only draw as much current as it needs to. Your servo controllers would get damaged by 5A just as quickly but that's not what it is getting. Look at it like this, the system has a fixed resistance and the power supply delivers a fixed voltage since the power supply is regulated. Current is then variable based on Ohm's law (I=V/R). The 5A rating on the power supply is simply a maximum that it can deliver.

You can use either of those power supplies and there will be no problems. I would recommend you use the 2A one since there is only one other device on it.

_________________
Brian Burley
403-282-7335 ext. 6003
support@phidgets.com


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PostPosted: Mon Jan 09, 2012 8:36 am 
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Phidgetly

Joined: Sun Jun 05, 2011 5:15 am
Posts: 32
Brilliant .. thanks Burley, much appreciated.

Thanks to these forums I'm slowly getting a working knowledge of electronics.


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