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?

 

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.

 

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.