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Old 22nd February 2010, 08:03 PM   #11
Apex Jr is offline Apex Jr  United States
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Infinia...

Call me, 818 248-0416

These pots have dual 4 pin connections, maybe you can help
me finding out how to check for the taper.

Alps only have a dual 3 pins.

Steve @ Apex Jr.
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Old 22nd February 2010, 08:39 PM   #12
msb64 is offline msb64  Canada
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Quote:
Originally Posted by Apex Jr View Post
Infinia...

Call me, 818 248-0416

These pots have dual 4 pin connections, maybe you can help
me finding out how to check for the taper.

Alps only have a dual 3 pins.

Steve @ Apex Jr.
Going by Infinia's previous description:

Set the 25K pot to halfway, and use a multimeter to take a resistance reading.
If it reads 12.5K it is linear, if it reads 5K it is audio taper.

Use the pins that show a range of 0 - 25K when the pot is rotated clockwise.

Last edited by msb64; 22nd February 2010 at 08:42 PM.
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Old 22nd February 2010, 09:04 PM   #13
Apex Jr is offline Apex Jr  United States
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OK...
Didn't work.
Pot has a center detent

0 0 0 0

using the bottom row
pins 2 and 3 in center detent is 25K
pins 2 and 3 all the way to the right 25K
Pins 2 and 3 all the way to the left 5 ohms - 7 ohms

Also in center detent I get 25K withs pins 1 and 3
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Old 22nd February 2010, 09:15 PM   #14
Xoc1 is offline Xoc1  United Kingdom
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When choosing pots I always found that a linear pot used with a law faking resistor gives a good performance. Also if you don't like the attenuation slope you can always change the value of the law faking resistor to give you more adjustment at your preferred listening level.
Personally though I use a stepped switch attenuator - limited adjustment - hair shirt etc, but once listened to its hard to go back
Apex jr
looks like you have a linear 50K pot. to use this as a volume control try putting a 5 to 10K resistor between the centre wiper pin and the ground pin.
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Old 22nd February 2010, 09:32 PM   #15
infinia is offline infinia  United States
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Hi Steve
on 4 pins/section pots usually 1 of them is a dummy
you should be able to find the wiper easily as its resistance changes in relation to the outer 2 that stay at a fixed resistance of 25K. note this


Q for you on these 2 pots then
Alps 3 pins per section no detent?
Nobel 4 pins/section with center detent?

this should explain everything (see figure 4 here) wiper center is at 120 degrees on chart
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Last edited by infinia; 22nd February 2010 at 09:46 PM.
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Old 22nd February 2010, 09:49 PM   #16
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my APT-Holman preamp has a stepped attenuator. I think 32 pos?

I like it, but not really necessary for this amp project.
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Old 22nd February 2010, 09:54 PM   #17
infinia is offline infinia  United States
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Quote:
Originally Posted by Xoc1 View Post

looks like you have a linear 50K pot.
central detent... thinking its a balance control thingy
If it's 50K he should of measured that already
maybe one pin is fixed halfway?

"you can always change the value of the law faking resistor" I think so ...that's probably what most of the manufacturers do (so a linear would be the most flexible to get IMO)
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Last edited by infinia; 22nd February 2010 at 10:01 PM.
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Old 22nd February 2010, 10:47 PM   #18
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call me crazy but cheapo carbon pots sound great to me...!
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Old 22nd February 2010, 10:51 PM   #19
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"call me crazy but cheapo carbon pots sound great to me...!"

Not looking for a sound difference. conductive plastic ones are said to be far more durable.
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Old 22nd February 2010, 10:56 PM   #20
infinia is offline infinia  United States
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Quote:
Originally Posted by chatziva View Post
call me crazy but cheapo carbon pots sound great to me...!
hi Crazy
Indeed esp the1 Meg ones are the best
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