Potentiometric Volt measurement

Discussion in 'General Electronics Chat' started by tommyboytml, Mar 6, 2013.

  1. tommyboytml

    Thread Starter New Member

    Mar 6, 2013
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    Why do the headphones stay silent when the voltage through the circuit matches the drop over the resistor being measured? I assume that they stay silent when you go over the drop also?
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    What circuit?

    Ken
     
  3. tommyboytml

    Thread Starter New Member

    Mar 6, 2013
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    Any circuit using test leads.

    I understand we can use the headphones as a null detector but why do they go silent? Is it because the voltage goes to zero when the voltage matches that of the component being tested? And do they stay silent if we use more volts than the amount dropped at the resistor being tested?
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Doesn't make sense. Can you post an example?

    Ken
     
  5. MrChips

    Moderator

    Oct 2, 2009
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    Some kind of AC Wheatstone bridge measurement system?

    Something like this?

    [​IMG]
     
    Last edited: Mar 7, 2013
  6. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    I bet MrChips is on the right track, but seriously, do you think that a multimeter (which definitely has test leads) does have some headphone connector or something? People here are usually very skilled at guessing what a person is actually talking about, but you should not count on it.
     
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