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Re: Automating extract fan (commercial type)
Paul Gale wrote:
> I should say that the proportional speed control needs an analogue
> 0-10v DC supply - so it's that I need to generate/control from HV.
I don't know anything about HV, but assuming you've got some digital
outputs, 10V supply (maybe regulate down from 12V?) and R/2R ladder:
<http://en.wikipedia.org/wiki/Resistor_Ladder>
Kim.
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