[sdiy] A little OT, Begging a hand

[Jerry Gray-Eskue]

FYW???

Should have been for what its worth...
----- Original Message ----- 
From: "Jerry Gray-Eskue" <jerryge at cableone.net>
To: "Veronica Merryfield" <veronica.merryfield at shaw.ca>; "synth DIY" 
<synth-diy at dropmix.xs4all.nl>; "Ian Fritz" <ijfritz at comcast.net>
Sent: Tuesday, February 08, 2011 2:06 PM
Subject: Re: [sdiy] A little OT, Begging a hand


> 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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