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Design of a DC voltmeter circuit

Discussion in 'Electronics Homework Help' started by Maca, Nov 28, 2017.

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  1. Maca

    Maca

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    Nov 28, 2017
    I need to design the circuit of a voltmeter that measures DC voltage from 0 to 10 v, Someone could help me since I do not know what capacity to use the resistors and capacitor

    Thank you
     

    Attached Files:

  2. davenn

    davenn Moderator

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    Sep 5, 2009

    where did that circuit come from ?
    why are you not using a standard voltmeter ?
     
  3. dorke

    dorke

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    Jun 20, 2015
    @davenn,
    It looks like trying to make a "JFET VTVM" with an analog meter.,
    most probably belongs to the Homework Help.
     
  4. WHONOES

    WHONOES

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    May 20, 2017
    Much easier to use an opamp. Better results too.
     
  5. Audioguru

    Audioguru

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    Sep 24, 2016
    I made that circuit 48 years ago. Its "zero" drifted all over the place when the temperature changed.
     
  6. AnalogKid

    AnalogKid

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    Jun 10, 2015
    You can reduce the zero drift by 50% or more with a couple of diodes.

    ak
     
  7. Audioguru

    Audioguru

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    Sep 24, 2016
    Does the teacher expect the student to ask on an online forum how to design a 48 years old circuit without giving any instructions about how it works?
     
  8. Ian

    Ian Administrator

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    Aug 23, 2006
    @Maca - is this a school/homework question?
     
  9. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    @Ian: Assuming so I moved this thread before reading your post. I can always re-move it if the assumption is wrong.
     
    Ian likes this.
  10. davenn

    davenn Moderator

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    Sep 5, 2009

    also after 6 days he hasn't bothered to come back and answer the asked Q's

    I'm going to close the thread
     
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