Did i get the wrong POT's ?

[Lestat]

someone who has the electrical knowledge look at this PDF and tell me if i got the wrong pot's.

im looking over this pdf and getting the sneaky feeling i ordered the wrong ones.

http://www.bitechnologies.com/pdfs/67.pdf

they are a 50k adjustable pot.

im looking at wiring up to 1 and 2 correct or is it 1 and 3 ?

[SoddemFX]

1 and 2, or 2 and 3.

Yes you did choose the right type :) Just make sure you set the resistance of whichever contacts you choose (1+2 or 2+3) to the maximum (50K) value before you solder and you'll be fine...

Tom

[Lestat]

thanks tom.

whats the going rates for POT's anyways.
i thought i saw radio shack had the blue ones i see everone using for like 2 bucks or something

[SoddemFX]

£1 each individual over here from Farnell/RS or about £0.15 in 1000's if you buy from manufacturers/main distributors but you have a few weeks lead time... :)

Tom

[Dumo]

Heres...http://elexp.com/cmp_mpt5.htm

[Lestat]

sheesh see if i ever buy anything from mouser again. that was even with my distributor discount.

damn .95 a pop wow.. i spent 2.05 each.

just testing with the DMM
1-3 gives me 48ohm


ps

ahh mine are ROHAS compliant that would explain a slight increase in price

[Lestat]

1 and 2, or 2 and 3.

Yes you did choose the right type :) Just make sure you set the resistance of whichever contacts you choose (1+2 or 2+3) to the maximum (50K) value before you solder and you'll be fine...

Tom


ok im going thru and setting and marking all pot's to the midpoint.
roughly 25ohms

now you are saying to set them to max resistance before mounting them or before soldering the wires to them
wouldnt max resistance cause whateve i solder them to on the baord, once i turn on the motherboard to have the maximum voltage that it could possibly have thus totaly smoking anythin its attached to ?

wouldnt you have Zero resistance so that its identicle to the resistance given by the motherboard ?

i have always said that electrical has been the weakest part of anything i have ever done. so...


eidt

let me clarify what i have been told.
increased resistance increases the voltage to what your modding.
so why would i start with maximum resistance ?

[SoddemFX]

increased resistance increases the voltage to what your modding.
so why would i start with maximum resistance ?

In a typical voltage modification you'll be shunting a resistor in a potential divider to ground to decrease the voltage fed back to the controller. To maintain equilibrium with the controllers (fixed) reference voltage, the controller increases the output until the feedback voltage does equal the reference voltage.

In almost all cases you want to start with a high resistance...

With 0-Ohms to ground, feedback will never equal reference and the controller will hit OVP, OCP or approach input rail voltage on the output...

//Sorry for late reply :)

Tom

[NO1B4ME]

ok im going thru and setting and marking all pot's to the midpoint.
roughly 25ohms

now you are saying to set them to max resistance before mounting them or before soldering the wires to them
wouldnt max resistance cause whateve i solder them to on the baord, once i turn on the motherboard to have the maximum voltage that it could possibly have thus totaly smoking anythin its attached to ?

wouldnt you have Zero resistance so that its identicle to the resistance given by the motherboard ?

i have always said that electrical has been the weakest part of anything i have ever done. so...


eidt

let me clarify what i have been told.
increased resistance increases the voltage to what your modding.
so why would i start with maximum resistance ?


Did you ever get this done? I am curious as i have them in hand ready to do mine.