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Old 20th January 2006, 11:06 PM   #1
Wasted is offline Wasted  Ireland
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Default Stepped Attenuator 100kohm

Hello guys, new to forum and diy audio in general but have brrn bitten by bug, I just seen a passive pre amp that consists of a stepped attenuator and a lot of resistors. There was a link to the site but its all in chinese I thinks. Have fpound other kits but they start at $120 a kit Does anyone know of a site I can find them a little less pricey, Thanks Link to site is
http://www.my3c.net/product/detail.a...=&Sort=&Price=
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Old 21st January 2006, 02:24 AM   #2
lineup is offline lineup  Sweden
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you can buy a good rotator switch ( 12 steps )
then you put your own resistors in ( 12 resistors )
this makes lowest price

you could put a -20dB switch beside the stepped attenuator
so this will cover two different spans of volume ( 24 positions )

there are 24 positions switches to buy, but they cost a lot more

values for a 100 kOhm potentiometer will depend if you want
- linear characteristic - all resistors same value
- logarithmic characteristic - values are progressive, from lower resistors to higher

logarithmic is most often used in audio
this will make you hear same loudness difference for each step
for example -2.5 dB for each step
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Old 21st January 2006, 11:51 AM   #3
Wasted is offline Wasted  Ireland
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Thanks lLineup that sounds(Excuse pun) like a way to go if. If can't l learn Korean in the next few weeks then this is the way to go.
By the way here is a link for calculating resistor values for attenuator Haven't tried it myself as I don't have one.
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Old 21st January 2006, 12:33 PM   #4
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Here's one that I ordered....

23 step Vishay with Dales in the kit. I think it's about $55 with the shipping. I don't think there is a better price. It was here within the week.

I have not assembled it yet wut it looks great. This guy is also known as the seller "wanfai" on eBay.
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Old 21st January 2006, 06:53 PM   #5
Wasted is offline Wasted  Ireland
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Thanks Guys all very helpful, now whereto next?
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Old 21st January 2006, 07:03 PM   #6
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... for a walk then to finish my Aleph.
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Old 22nd January 2006, 11:50 PM   #7
Wasted is offline Wasted  Ireland
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Just one last thing anyone got a good plan for a passive preamp using a 23 step attenuato, I kow I know I tend to get ahead of myself. Put it down to youthful exuberence(Ahem)!
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Old 23rd January 2006, 06:26 AM   #8
phaeden is offline phaeden  Australia
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Here is another site : http://www.diyfidelity.com.au/

I am using one as a passive - much better than a blue Alps and reasonably priced.
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Old 23rd January 2006, 08:31 PM   #9
Wasted is offline Wasted  Ireland
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thanks guys found this site , anyone know if he is on diyAudio? And can any one tell me advantage of such a design.

http://www.shine7.com/audio/passive_pre.htm
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