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DIY pot ganging
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Old 1st December 2017, 05:38 PM   #11
levistubby is offline levistubby  United Kingdom
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Alps seem to make some four gang motor pots, but I don't know what values are available.


https://www.amazon.co.uk/ALPS-Engine.../dp/B00KBW7B3G
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Old 1st December 2017, 06:18 PM   #12
scottjoplin is offline scottjoplin  Wales
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That sure would be the simple, logical way to go, they even do a six way Alps Rk16816mg 6-way High-end Motor Potentiometer 10k Logarithmic | eBay
It has a "D log" taper specifically designed for surround sound systems apparently, any ideas? https://www.pot4audio.mobi/daten/pdf/RK16816MG.pdf
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Old 2nd December 2017, 02:44 PM   #13
johnnyx is offline johnnyx  United Kingdom
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I have just ordered the 6-gang pot. I never saw this before in a search. Maybe this is designed for surround sound receivers. How good is channel tracking? We'll see.
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Old 2nd December 2017, 02:57 PM   #14
scottjoplin is offline scottjoplin  Wales
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"Gang error 2dB max at 150 degrees" Info in the pdf above. I'm tempted
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Old 3rd December 2017, 07:42 PM   #15
levistubby is offline levistubby  United Kingdom
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"I'm interested to know why you think it would be better than pulley and belt?"


In a word - simplicity. Two pots geared together is easier to implement. With toothed belts you have to work with the available belt lengths.


If you want motorised pots there may be no need to physically link the pots if the motor power supplies can be synchronised. Maybe by feedback from the changing pot values. Interesting possibilities but mechanical coupling would take less development work.
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Old 3rd December 2017, 08:33 PM   #16
scottjoplin is offline scottjoplin  Wales
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I think the only way to guarantee accuracy would be if stepper motors were used
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Old 3rd December 2017, 09:27 PM   #17
rex_johnston is offline rex_johnston  Norfolk Island
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like this?
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File Type: jpg 2017-12-04 08.21.50.jpg (682.3 KB, 90 views)
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Old 3rd December 2017, 09:47 PM   #18
scottjoplin is offline scottjoplin  Wales
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I like it, looks like my preamp! Also my plan is for use with the DCX2496!
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Old 3rd December 2017, 10:11 PM   #19
johnnyx is offline johnnyx  United Kingdom
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I have a DCX2496, and I used to have 3 PGA2310 to control the volume. There was a problem though. After a few months use, it would go full volume and blow a tweeter. After the second time, I thought the only way to stop this would be to re build it using proper pots with attenuation. The PGA2310 can give 30dB of gain, and I suspect a fault in the wiring made it so, but infrequently enough to make it impossible to trace.
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Old 3rd December 2017, 11:33 PM   #20
rex_johnston is offline rex_johnston  Norfolk Island
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Quote:
Originally Posted by johnnyx View Post
I have a DCX2496, and I used to have 3 PGA2310 to control the volume.
I did consider this, and actually have most of the bits to put in place a digital volume control.
Then i thought, as long as i'm having to use a microprocessor, i might as well use a metal film resistor array so i have better control of the volume and it would work better with the 12AT7s i'm using as balanced <-> unbalanced converters. Then i thought, b*gger it, i'll use a stepper and lots of multiturn wirewound pots, that way i can adjust the individually with an allen key and a screwdriver from the front. There has been a LOT of phaffage getting it to work nicely.

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