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Using blue Alps as vol control
Using blue Alps as vol control
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Old 15th April 2019, 10:54 AM   #11
MEPER is offline MEPER  Denmark
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Quote:
Originally Posted by Zung View Post
In practice, the ratio Rwiper/Rtotal will give you the attenuation.

The above mentioned 50k. One channel measure 47.1 k and the other 47.5k (why do they call them 50k pots?). But the error from wiper to one end is not consistent. It depends on the wiper setting. So I can not just add a 0.4 k resistor to the resistive element but I may be able to correct the error a bit.


A typical setting measuring the side that goes from 0 - 47k:
34.5/47 = 0.734
35.2/47 = 0.749
So with 1V in I get 0.734V out in one channel and 0.749 out in other channel. Relative to 1V it is -2.69 dB vs -2.51 dB ….so that it not much of a difference.....?
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Old 15th April 2019, 11:37 AM   #12
Zung is online now Zung  Switzerland
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0.18dB is pretty good for R&R
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Old 15th April 2019, 11:58 AM   #13
MEPER is offline MEPER  Denmark
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It is at least something you can measure…….compared to if an interconnect cable is slivered or not? :-)
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Old 15th April 2019, 12:23 PM   #14
Zung is online now Zung  Switzerland
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Wait until you're confronted with contact rectification, resistive element composition (carbon/cermet/conductive plastic), wiper geometry, and so on, and you still have to wire it up with OFC/silver/litz/solid core..., and solder with Sn/Pb/Ag.

Dealing with the unknown is a lot more fun!
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Old 15th April 2019, 12:56 PM   #15
MEPER is offline MEPER  Denmark
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Ok.....then this Einstein quote fits?

"Not everything that can be counted counts, and not everything that counts can be counted"

But we have to remember this is "audio"......not atom physics…. :-)
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Old 15th April 2019, 01:03 PM   #16
Zung is online now Zung  Switzerland
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Old 15th April 2019, 01:33 PM   #17
ColinA123 is offline ColinA123  United Kingdom
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My opinion.
I tried the DACT attenuator, it felt nice with soft clicks.
However I found the larger ones with Dale resistors sounded cleaner. (To my old ears)
I use twin mono ladder type as passive attenuator between music server and F6 amp
https://www.ebay.co.uk/str/ATOPELEC/...cat=3427425219 (Other suppliers are available)
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Old 15th April 2019, 02:43 PM   #18
MEPER is offline MEPER  Denmark
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They have a lot of good stuff in that ebay store.
To mono pots......if you can easy see each step then it could be a good solution.
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Old 15th April 2019, 02:52 PM   #19
Zen Mod is offline Zen Mod  Serbia
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Using blue Alps as vol control
Quote:
Originally Posted by ColinA123 View Post
My opinion.
I tried the DACT attenuator, it felt nice with soft clicks.
However I found the larger ones with Dale resistors sounded cleaner. (To my old ears)
I use twin mono ladder type as passive attenuator between music server and F6 amp
https://www.ebay.co.uk/str/ATOPELEC/...cat=3427425219 (Other suppliers are available)
from experience - I don't trust these switches , unless I didn't opened it and put some quality grease in ( Vaseline at least)

some of them even need patient de-burring of all edges inside , or you'll get no contact situation in less than a year

I'm using 2 section/24 position ones for my Iron as relay command - greased with Mo-Si , both sections in parallel .... that way I can trust them ..... while I had 4 problematic pre-finished attenuators , of 5 I bought several years ago , and all of them gone Dodo in less than a year

however - they're cheap , just buy more
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Old 15th April 2019, 03:13 PM   #20
MEPER is offline MEPER  Denmark
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So we are back to a Elma switch for quality if stepped attenuator or maybe Khozmo…..will see how my is doing after a year or just Alps.....for a "normal" type pot. Don't know if wire wound pots is an option...….
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