How to generate 0 to 12 adc voltage

Discussion in 'General Electronics Chat' started by jobycm, Dec 18, 2014.

  1. jobycm

    Thread Starter New Member

    Nov 17, 2011
    22
    3
    Hi,

    I wanted to generate a linearly variable voltage ranging from 0 to 12 volt similar to normal adc (0 to 5 v). My purpose is to upgrade my (0 to 5v) adc to a (0 to 12v) system. Please help me with this.

    Thanking you..
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi,
    Are you asking for a 0 to +12V ramp voltage generator
    or
    an OPA amplifier to condition an existing 0 to +5V ramp signal to 0 to +12V?
    or
    both.:)
    E
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    I suggest using an amplifier with a gain of 2.4.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,791
    1,103
    A 12V supply and a linear potentiometer across it?
     
  5. ramancini8

    Member

    Jul 18, 2012
    442
    118
    I don't know what you are after, but if you employ a generic op amp without using the proper techniques your precision will decrease.
     
  6. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    Exactly what are you going to do with the 12V?
     
  7. jobycm

    Thread Starter New Member

    Nov 17, 2011
    22
    3
    An op amp amplifier with 2.4 gain sounds feasible. My existing setup is a variable voltage out which varies between 0 to 5v, I want a ratio circuitry setup so that i could use this (0 to 5v) as input to the circuit to generate a 0 to 12v output.

    Thanking you...
     
  8. jobycm

    Thread Starter New Member

    Nov 17, 2011
    22
    3
    The variable voltage out (0 to 12v) is to be used simply as some sensor input.
    Do you guys know if there is a DAC or a digital potentiometer which could generate or source a 12 volt variable voltage??
     
  9. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Here is a circuit. It requires a +15V single supply if you use a LM324 or LM358. These work with their inputs at or slightly below Vss (0V), and their outputs pull close to (but not all the way to) Vss. Otherwise you will need split supplies to get to zero output... 103.gif
     
  10. jobycm

    Thread Starter New Member

    Nov 17, 2011
    22
    3
    Thank you guys...
     
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