0-10V with 12V PSU

Discussion in 'The Projects Forum' started by tmvvk, Apr 3, 2014.

  1. tmvvk

    Thread Starter New Member

    Apr 3, 2014
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    Hello,

    I'm currently working on making a simulation for the 0-10V analog inputs on the Zelio PLC. It's being fed with 12V and I'd like to make a simple regulator from 0-10V. Sadly I've forgotten most about constructing circuits.

    Would the TS7800 with a potentiometer work?

    Anybody that can help?


    Greetings,
    Thomas
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,061
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    Use an LM117 or LM 317. Unfortunately, this chip will only get you down to 1.25 volts in a simple circuit.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
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    How low does the output realy have to go?
     
  4. tmvvk

    Thread Starter New Member

    Apr 3, 2014
    2
    0
    I need 2-10V (adjustable to x.1V). Can someone tell me the component values needed in this (example) schematic for that purpose?
    In = 12V


    [​IMG]

    Thanks loads.
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Metalmann likes this.
  6. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    What model Zelio PLC are you using? If the Analog inputs are high impedance, you only need a pot and a resistor.

    Ken
     
  7. crutschow

    Expert

    Mar 14, 2008
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    The LM317 needs about 3V minimum for regulation, thus the maximum output voltage with a 12V input would be about 9V.

    If the PLC input impedances are relatively high then just use a pot as Ken suggested. A 1kΩ pot, for example, has a maximum output impedance (at midrange) of only 250Ω. If you need a lower output impedance than that, you could use a rail-rail opamp follower at the pot output.

    If you wanted to get fancy, then you could use a 10-turn 1kΩ pot with a 10-turn dial to give better than 10mV resolution. If you add a 500Ω trimpot in series with the 10-turn pot than you can calibrate it so that 1 turn of the 10-turn pot equals 1V.
     
  8. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    .........?
     
  9. crutschow

    Expert

    Mar 14, 2008
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    You have a question, grasshopper? At midpoint the wiper is looking at two 500Ω resistors that are in electrical parallel, assuming one goes to ground and the other goes to a low impedance source. I leave it to you to do the math.
     
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