OT Electronics Help

[Mikkel L. Ellertson]

aragonx at dcsnow.com wrote:
> Okay so this is way off topic but I need some help.  I tried doing a
> Google search but I don't know enough to get my query right.
> 
> I have several external components that I would like to come on when my
> computer comes on.  I would also like them to go off when my computer goes
> off.  Some sort of electronic switch that I could plug in to one of my
> PC's spare 4 pin power plugs work work fine.
> 
> To make things a little more complicated (and Linux related) I would also
> like this.  I have a water cooling system with a variable voltage water
> pump.  It would be nice if I could simply poll lmsensors and have a
> program bump up the voltage until the CPU is below a certain temperature.
> 
> Does anyone know where I should start?  I don't mind wiring up something
> myself as long as I know what components I should be looking at.
> 
> Thanks for the help in advance.
> 
> 
For switching AC from your 12VDC output, you may find something like:

http://www.allelectronics.com/make-a-store/item/SSRLY-42/40-AMP-SOLID-STATE-RELAY/1.html

For your cooling setup, you may want to look at a D-to-A converter
driving a power transistor. You will have to search for the current
products - it has been a while sense I have looked into them.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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