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post #11 of 25
If one of the points has the same resistance to ground as Pin 18, we know both are connected by the conducting path.
In fact it would be enough to have one point connected. I've just tagged several ones to get various alternative solering spots.
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post #12 of 25
Thread Starter 
Quote:
Originally Posted by mAlkAv!An View Post
If one of the points has the same resistance to ground as Pin 18, we know both are connected by the conducting path.
In fact it would be enough to have one point connected. I've just tagged several ones to get various alternative solering spots.
Thanks malk

The only one that matched the GND reading was this one:



On the image i wrote 4.40 but the reading was actually 4.32 consistant with GND and the resistor.

So with a reading of 4.32 on the 20K Ohm setting then what sort of Pot/VR would i be looking to grab?
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post #13 of 25
Do you mean the point you've marked is connected to ground?
Do you read 4.4k Ohms at Pin18?

Sounds like there is a misunderstanding here
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post #14 of 25
Thread Starter 
Sorry for the misunderstanding.
I mean that when connecting pin 18 to GND and then after to that resistor i get the same readout, 4.32K Ohms
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post #15 of 25
That's ok, even though it does look like as the path is having another way.

Just to be sure, you put the black cable of your multimeter to GND and the red one to Pin18 gives you 4.32k Ohms. Then putting the red cable to the labelled part of the resistor(black cable to GND) gives you 4.32k Ohms again?

Anyway, if it reads 4.32k Ohms you should grab a 200K VR.
Edited by mAlkAv!An - 1/11/11 at 9:58am
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post #16 of 25
Thread Starter 
Quote:
Originally Posted by mAlkAv!An View Post
That's ok, even though it does look like as the path is having another way.

Just to be sure, you put the black cable of your multimeter to GND and the red one to Pin18 gives you 4.32k Ohms. Then putting the red cable to the labelled part of the resistor(black cable to GND) gives you 4.32k Ohms again?

Anyway, if it reads 4.32k Ohms you should grab a 200K VR.
Yep, both reading 4.32K Ohms. Verified this by shading in the resistor for pencil mod, allowed me to run slightly higher

Why a 200K VR? wouldn't a 50K one work?
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post #17 of 25
I would actually use a 100k there. 200k would probably be a bit under stock V at max resistance, 100k should be close, maybe a bit over stock, 50k would be higher than stock voltage at max resistance.
    
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post #18 of 25
You will never get less than stock voltage. Resistors in parallel will always result in a lower final resistance.

Using a 100k Ohm VR at a original resistance of 4.32k Ohms results in a final resistance of 4.14k Ohm.
200k VR gives you 4.23k Ohm at max resistance. 50k VR -> 3.98k Ohms.

greetings
Edited by mAlkAv!An - 1/11/11 at 11:28pm
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post #19 of 25
I didn't know that, my closest vr has always been a touch less that R x 20 & I usually see a slight V increase there. Thanks man
    
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post #20 of 25
The formula to calculate the final resistance of 2 resistors in parallel is as follows:

Rtotal = R1*R2 / (R1+R2)


Where R1 is the resistance at FB pin for example and R2 the variable resistor.

Like this:
200,000*4,320 / 200,000+4,320 = 4,228.66
Edited by mAlkAv!An - 1/12/11 at 11:57am
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