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Old 29th March 2019, 07:31 AM   #1
hydrovac is offline hydrovac  India
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Default Stepped Attenuator wiring

I've had one of these sitting in my inventory for a couple of months now, waiting to put it in the BA-3 preamp.

But I can't for the life of me work out the wiring connections. I know a couple of others are using these... can you point me in the right direction?

It's one of these:
s7 1035.jpg

s7 1036.jpg

s7 1037.jpg
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Last edited by hydrovac; 29th March 2019 at 07:37 AM.
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Old 29th March 2019, 08:42 AM   #2
ferret is offline ferret  South Africa
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Can you take a few more pictures of the attenuator around the periphery? Need to see the other connection points please.
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Old 29th March 2019, 09:53 AM   #3
hydrovac is offline hydrovac  India
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As far i can make out, these appear to be the only previously connected terminals on the fourth image.
Attached Images
File Type: jpg 20190329_150447.jpg (508.3 KB, 194 views)
File Type: jpg 20190329_150521.jpg (536.4 KB, 190 views)
File Type: jpg 20190329_150543.jpg (565.4 KB, 190 views)
File Type: jpg 20190329_150915.jpg (522.0 KB, 183 views)
File Type: jpg 20190329_151134.jpg (548.1 KB, 175 views)
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For some people, it's a part of life. For others it's irrelevant.
The mysteries of neurology and how our individual brains function.

Last edited by hydrovac; 29th March 2019 at 09:55 AM.
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Old 6th April 2019, 01:01 PM   #4
quadtech is offline quadtech  India
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Hydovac , you probably deciphered this by now, but anyways, my curiosity
was piqued. Found quite a few useful links which I thought will collate here
for future reference -

Click the image to open in full size.

Click the image to open in full size.

Kikitronic -- DIY Audio Kits: Dale 23 Steps Attenuator
Steppin’ out | PS Audio
http://8audio.com/image/volumecon.jpg
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Old 6th April 2019, 01:46 PM   #5
chromenuts is offline chromenuts  United States
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I had the same problem with a set of new 25K Mono attenuators I purchased from Super-market8 on eBay.

I couldn’t find documentation anywhere in any of their listings even though I thought there was an illustration posted when I first bought them several years ago.

I wanted to use them recently and also saw the images posted above, but they seemed to be different enough to make me scratch my head and I gave up out of frustration and used some pots I had on hand instead.

I recently sent the seller a message. I’ll post up if I receive anything back.

Pic of my version below.
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File Type: jpg BA156416-6710-48B8-A3CA-AC0D918E572F.jpg (608.1 KB, 34 views)
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Old 3rd July 2019, 02:34 PM   #6
merlin el mago is offline merlin el mago  Europe
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@hydrovac, It's a series attenuator see attached pic showing connection for one channel.
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Old 3rd July 2019, 02:42 PM   #7
merlin el mago is offline merlin el mago  Europe
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Quote:
Originally Posted by chromenuts View Post
I had the same problem with a set of new 25K Mono attenuators I purchased from Super-market8 on eBay.

I couldn’t find documentation anywhere in any of their listings even though I thought there was an illustration posted when I first bought them several years ago.

I wanted to use them recently and also saw the images posted above, but they seemed to be different enough to make me scratch my head and I gave up out of frustration and used some pots I had on hand instead.

I recently sent the seller a message. I’ll post up if I receive anything back.

Pic of my version below.
It's a ladder see attached pic.
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File Type: jpg Sin título.jpg (502.3 KB, 12 views)
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Old 3rd July 2019, 05:11 PM   #8
merlin el mago is offline merlin el mago  Europe
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Quote:
Originally Posted by quadtech View Post
Hydovac , you probably deciphered this by now, but anyways, my curiosity
was piqued. Found quite a few useful links which I thought will collate here
for future reference -

Click the image to open in full size.

Click the image to open in full size.

Kikitronic -- DIY Audio Kits: Dale 23 Steps Attenuator
Steppin’ out | PS Audio
http://8audio.com/image/volumecon.jpg
Different types here: 1st pc it's a series & 2n pic it's a shunt.

Series is summing the resistor value of each step: for example if you are using step 6 you have the total value of 6 resistors. Input is the first resistor & last resistor output is ground, so source sees always the total impedance of all 23 resistors if the stepped attenuator have these steps.

Shunt is only one resistor each step, so the source doesn't see always the same impedance.

Last edited by merlin el mago; 3rd July 2019 at 05:16 PM.
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