[sdiy] A little OT, Begging a hand

[Jerry Gray-Eskue]

Hmm FYW I see 6 meaningful configurations that can be measured:

o = Open
H = High
L = Low

V1  V2  V3
o_H_L
H_o_L
H_L_L
H_H_L
L_H_L
H_L_o

----- Original Message ----- 
From: "Ian Fritz" <ijfritz at comcast.net>
To: "Veronica Merryfield" <veronica.merryfield at shaw.ca>; "synth DIY" 
<synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, February 08, 2011 1:16 PM
Subject: Re: [sdiy] A little OT, Begging a hand


> Hi --
>
> I'm pretty sure your problem is underdetermined. Here's my reasoning:
>
> The problem has four independent variables, if I understand it correctly. 
> Take the delta in the circuit and convert it into a wye (pictorially). 
> You now have a wye with series resistors in each arm.  You may add the 
> series resistors together. Now you have a wye with three unknown resistors 
> connected to V1, V2 and V0, plus a known resistor connected from V0 to V3.
>
> So now you see that your system is equivalent to a circuit with only three 
> unknowns.  Thus whatever measurements you make the best you can do is to 
> determine three combinations of your four unknown resistances.
>
> Ian
>
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