pot to 0 to 10 volt

jimcav · Nov 4, 2009

I have a 4000 ohm pot and i need to make it a 0 to 10 volt signal, i know i could do it with a resistor and zener diode.
Is there a more robust way to do this? is there a conditioning module i can buy.

curlyandshemp · Nov 4, 2009

jimcav said:
I have a 4000 ohm pot and i need to make it a 0 to 10 volt signal, i know i could do it with a resistor and zener diode.
Is there a more robust way to do this? is there a conditioning module i can buy.

In a case like this i would use a 0-10vdc Analog output scaled to Max value feed the potentiometer. Then the wiper from the pot is the 0-10v DC input.

JHarbin · Nov 4, 2009

If you are willing to use a signal conditioner you could use this from Redlion

http://www.redlion.net/Products/ProcessControl/SignalConditioning/ProcessInputs/IAMS.html

Jim Harbin

bernie_carlton · Nov 4, 2009

i know i could do it with a resistor and zener diode

Wow - with no voltage source? I, and perpetual motion machine inventors everywhere, would like to see that diagram.

jimcav · Nov 4, 2009

Thanks

thanks using the 0 to 10 volt output is a great idea.

i happen to have a if2of2 card on the rack.

Thanks again

daba · Nov 4, 2009

I don't know what could be more "robust" than a simple potential divider circuit, using a resistor in series with the potentiometer to 0V.

You haven't said what your source voltage will be, I will assume 24V.

Your Pot is 4,000 ohm, and is required to drop 10V, so the series resistor to the 24V supply will need to be :-

(24 * (4000/10)) - 4000 = 5600 ohms

Power rating for the 5600 series resistor is :-

((24-10)^2 / 5600 = 0.035 W

Power rating of the pot is :-

((10-0)^2 / 4000 = 0.025 W

TConnolly · Nov 4, 2009

Dataforth, Phoenix, Redlion, Action Instruments, and several dozen others all make signal conditioners that will accept a pot input and output a 0-10V signal. Most of them auto-range to the pot.

http://www.actionio.com/products/slimpak/g438.html

http://www.dataforth.com/model.view.aspx?modelid=26

Roy Matson · Nov 4, 2009

Supply the pot with 10 Volts and the slider will give you 0-10, it's as simple as that!

ydtech · Nov 5, 2009

I wouldn't use the 24V to a voltage divider directly. It's often not all that well regulated and with other loads switching on and off is likely to be quite noisy. One way would be to regulate it down with a LM317 or similar, with heavy filtering on input and output. Being practically unloaded this one would do nicely: http://www.onsemi.com/PowerSolutions/product.do?id=LM317L

This one is even better: http://www.onsemi.com/PowerSolutions/product.do?id=TL431

pot to 0 to 10 volt

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