Thevenin and wheatstone bridge

Discussion in 'Homework Help' started by steve135, Aug 7, 2015.

  1. steve135

    Thread Starter New Member

    Jun 29, 2015
    11
    0
    Hello everyone, I had to find thevenin equivalent to a wheatstone bridge which I had done, presumably correctly. Recently, however, I was looking into the practical application of a wheatbridge circuit for strain gauges and a TI document had an example. The question I had was about page 2; they show 2 thevenin equivalent circuits. If I find just 1 I get Rth=1k ohm and Vth=50mV. Page 3 shows why it was useful showing the impedance of the circuit being taken into account for the gain. I have tried choosing different terminals for A and B to open circuit to no avail. Either that's the wrong approach or I have been choosing the wrong terminals. Any suggestions?
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,750
    4,797
    If you "find just 1", just 1 what?

    You need to show your work so that we can see what you are doing right or what you are doing wrong.
     
  3. steve135

    Thread Starter New Member

    Jun 29, 2015
    11
    0
    I have some hand written work I attached, I hope that better explains were I am at, sorry about that and thanks for your response.
     
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