piclist 2001\02\26\092721a >
Thread: Formula for unbalanced bridge Rx-> V - take 2!
www.piclist.com/techref/index.htm?key=formula+unbalanced
flavicon
face BY : mike.....@whitewing.co.uk



Oops - mixed up Rx and  R2 - let's try again...

Vin
R1 R2
+--|--
|  +-- Vout
R3 Rx
0V

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

Vout = Vin((R3/R1+R3) - (Rx/Rx+R2))
We want the answer for Rx given the Vout/Vin ratio- call this ratio V,
so this becomes :

V = (R3/R1+R3) - (Rx/Rx+R2)

..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)
..and can it be simplified further if R1=R2 ?

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


<slpk9tosm2fd51re98envgl9k1eediojcd@4ax.com> quoted-printable

See also: www.piclist.com/techref/index.htm?key=formula+unbalanced
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) Formula for unbalanced bridge Rx-> V - take 2!

month overview.

new search...