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Controlling a 0-5V device

Posted: Wed Mar 23, 2011 6:08 am
by unrepentant
In addition to fans and pumps I am looking to control a programmable switch mode power supply using the TMS -200. I need a controllable 0-5V signal, current draw is less than 150mA. Anyone know if I can just use a fan controller for this limiting it to 42% of the 12V total (is not clear to me how accurate the voltage control is or if the '%' figure truly proportional?) . If so is it possible to software limit the max on this 'fan' so as not to breach the 5V?

Thanks for any feedback. :D

Re: Controlling a 0-5V device

Posted: Wed Mar 23, 2011 10:22 pm
by unrepentant
OK so now I understand that the fans are pulse width modulation controlled, so the solution could be to put this PSU on a pump circuit which I think is analog - again same question around limiting the voltage max through the software? I can then use the extension board and control my two pumps (in parallel) using the second pump controller provided I keep within the current limit?

Re: Controlling a 0-5V device

Posted: Fri Mar 25, 2011 9:20 am
by Izerous
your molex connectors are 12v and 5v sources. Taking a molex cable and Splicing in a potentiometer on the 5v cable will give you manual control to what ever is hooked up too that cable. You just need to be careful of what you hook up to that cable in the future.