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Thread: Formula for unbalanced bridge Rx-> V - take 2!
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face BY : mike@whitewing.co.uk



I think I got the formula wrong last time...

Treating each side as a potential divider : Vout = Vin(R3/R1+R3) - Vin(R2/Rx+R2)

R1=R2, so this is now :
Vout=Vin(R3/R1+R3) - Vin(R1/Rx+R1)

Vout = Vin((R3/R1+R3) - (R1/Rx+R1))
We want the answer for Rx given the Vout/Vin ratio- call this ratio V,
so this becomes :

V = (R3/R1+R3) - (R1/Rx+R1)

..and this is where my algebraic ability grinds to a halt..!

So the question is how do you juggle this to get either  :
Rx = function_of(V)
Or (better, if possible)
Rx/R3 = function_of(V)

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Subject (change) Formula for unbalanced bridge Rx-> V - take 2!

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