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hydrovac 29th March 2019 08:31 AM

Stepped Attenuator wiring
 
3 Attachment(s)
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:
Attachment 746043

Attachment 746044

Attachment 746045

ferret 29th March 2019 09:42 AM

Can you take a few more pictures of the attenuator around the periphery? Need to see the other connection points please.

hydrovac 29th March 2019 10:53 AM

5 Attachment(s)
As far i can make out, these appear to be the only previously connected terminals on the fourth image.

quadtech 6th April 2019 02:01 PM

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 -

https://i.ebayimg.com/images/g/09wAA...Ula/s-l640.jpg

https://hfc-fs.s3-eu-west-1.amazonaw..._diagram_0.jpg

Kikitronic -- DIY Audio Kits: Dale 23 Steps Attenuator
Steppin’ out | PS Audio
http://8audio.com/image/volumecon.jpg

chromenuts 6th April 2019 02:46 PM

1 Attachment(s)
I had the same problem with a set of new 25K Mono attenuators I purchased from Super-market8 on eBay.

I couldnít 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. Iíll post up if I receive anything back.

Pic of my version below.

merlin el mago 3rd July 2019 03:34 PM

1 Attachment(s)
@hydrovac, It's a series attenuator see attached pic showing connection for one channel.

merlin el mago 3rd July 2019 03:42 PM

1 Attachment(s)
Quote:

Originally Posted by chromenuts (https://www.diyaudio.com/forums/diy-hifi-supply/335904-stepped-attenuator-wiring-post5752456.html#post5752456)
I had the same problem with a set of new 25K Mono attenuators I purchased from Super-market8 on eBay.

I couldnít 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. Iíll post up if I receive anything back.

Pic of my version below.

It's a ladder see attached pic.

merlin el mago 3rd July 2019 06:11 PM

Quote:

Originally Posted by quadtech (https://www.diyaudio.com/forums/diy-hifi-supply/335904-stepped-attenuator-wiring-post5752429.html#post5752429)
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 -

https://i.ebayimg.com/images/g/09wAA...Ula/s-l640.jpg

https://hfc-fs.s3-eu-west-1.amazonaw..._diagram_0.jpg

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.


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