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UGS-muse preamp GB
UGS-muse preamp GB
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Old 19th October 2020, 12:05 PM   #1691
Oneminde is offline Oneminde  Sweden
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Quote:
Originally Posted by schultzsch View Post
Oh my ... all that hurry in getting the pcbs... I thought you have it already built.
LOL... I know what you mean, but its two different things
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Old 19th October 2020, 03:29 PM   #1692
schultzsch is offline schultzsch  Europe
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Please don’t get me wrong but I am very curious about the enclosure you want to design... I think you know already
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Old 19th October 2020, 03:36 PM   #1693
Oneminde is offline Oneminde  Sweden
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Its an option and I do like it. But I also like the Dalby Audio Design, I am working on multiple projects and kinda want them to have similar chassis design & look. I've been collecting and researching, hence why I have not finished anything just yet.
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Old 19th October 2020, 05:33 PM   #1694
gionag is offline gionag  Italy
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UGS-muse preamp GB
just out of curiosity... who has already started ?
i have placed the order at mouser. waiting for the package.

4 UGS modules (2 gain stage + 2 buffer) are already made (i was already using them on my "el cheap-o" pre amp).

BTW, if someone is interested, i have made a fancy heat-sink-coupling-mass for the ugs gain stages. just be aware that suits only the sk389/sj109 combo.

if someone is interested, we can arrange some groupbuy also for them.
I have a cnc at work (where i have done mine...) and i can replicate them at price of cost (+some margin for the consumables).
don't mind the ugly washer's / screw combo, i haven't got the right bolt length, and i have improvised.

Surely can be anozied in whatever color you like.

The triple slot per each side is done in order to take into account the slight differences in the component body width and guarantee the best possibile adhesion.

just let me know.
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Old 19th October 2020, 05:57 PM   #1695
Oneminde is offline Oneminde  Sweden
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Nice heat sink ... Kinki studio inspired
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Old 19th October 2020, 06:09 PM   #1696
gionag is offline gionag  Italy
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UGS-muse preamp GB
it was really inspired by some piece of aluminium i had around when i was thinking about them

never heard about them, my bad... now i know. seems legit
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Old 19th October 2020, 07:27 PM   #1697
schultzsch is offline schultzsch  Europe
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Nice work gionag
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Old Yesterday, 10:31 PM   #1698
gionag is offline gionag  Italy
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UGS-muse preamp GB
in the meanwhile...

can someone make some light around this input matching network ?
how it supposed to be tuned ?

i will use both M1 as gain stage and M2 as buffer.
what is the best input resistance that ugs gain stage is supposed to see ?

my instint says that i will tune that for maxmim Zin... but maybe i am missing something.

thanks
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Old Today, 12:10 AM   #1699
Paul M is online now Paul M  Canada
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UGS-muse preamp GB
Hi Gionag,

I’m sure Eric and Alex can give more details on the input impedance matching than I can.
In the meantime, the way I adjusted it in my implementation is described here: <<UGS - Muse edition - Page 25>> - 30058092 - sur le forum <<Amplis et Preamplis>> - 1056 - du site Homecinema-fr.com

Basically, without any module and without power, adjust the trimmer for each leg of the circuit in order to get the same measured resistance between AGND and the corresponding test point. I remember setting mine to 12K, but not sure if another value would be more optimal.

Hope it helps
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