Formula for unbalanced bridge Rx-> V - take 2!
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)
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
See also: www.piclist.com/techref/index.htm?key=formula+unbalanced
You must be a member of the
piclist mailing list
(not only a www.piclist.com member) to post to the