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.asp?ky=&pid=1797&sgid=104&gid=7&gid2=&Sort=&Price=
http://www.my3c.net/product/detail.asp?ky=&pid=1797&sgid=104&gid=7&gid2=&Sort=&Price=
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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
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
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.
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.
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.
I am using one as a passive - much better than a blue Alps and reasonably priced.
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