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Old 6th March 2011, 06:36 PM   #10701
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Originally Posted by gray5596 View Post
Steve, if you put this pre-amp in a limited edition Altoids case, cryo it, critics will have ear-gasms and you'll be able to double the price!
Sorry, but there's no evidence that any two reasonably well designed mint tins sound any different.

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Old 6th March 2011, 06:46 PM   #10702
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A more important question is: Is the case, aluminum or steel?

Last edited by john curl; 6th March 2011 at 06:50 PM.
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Old 6th March 2011, 06:52 PM   #10703
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How about a photocell on the top of the case that charges an ultracap, that supplies the led? Now, THAT is engineering!
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Old 6th March 2011, 07:03 PM   #10704
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A more important question is: Is the case, aluminum or steel?
Steel of course. Which provides good magnetic shielding.

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Old 6th March 2011, 07:04 PM   #10705
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How about a photocell on the top of the case that charges an ultracap, that supplies the led? Now, THAT is engineering!
Nah. The ultracaps have too high an ESR. The light doesn't look as good compared to being supplied from a good low impedance power supply.

Oh, and a photocell won't charge anything.

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Old 6th March 2011, 07:13 PM   #10706
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Steel! Let's measure the added distortion!
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Old 6th March 2011, 07:23 PM   #10707
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Ultra caps can power flashlights, they can easily do a pilot led.
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Old 6th March 2011, 07:36 PM   #10708
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Steel! Let's measure the added distortion!
I mentioned it several times in this thread.

http://www.diyaudio.com/forums/analo...ml#post2403966
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Old 6th March 2011, 08:42 PM   #10709
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can the new processes keep the 1/f corner down - assuming anyone wanted to "spend" enough area on the input Q to try to match your 797 or 743 designs?
That is a managable problem (the details would escape most here). One of the issues is double epi and engineering in the low noise in the first place. These processes were optimized for speed (in hindsight, blindly), TI gave a paper at this ISSCC on an SOI JFET amp with 8nV at 10Hz. We are on it (I am just a vociferous fly on the wall for this project), keep tuned. The geometries have shrunk to the point that the area is not an issue. The 743/45 was a big risk experiment, the fact that GE ran a whole generation of CAT scanners based on it, saved it. I'm not sure if I could get away with a sub 3nV FET amp in this market again.
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Old 6th March 2011, 09:17 PM   #10710
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In fact the AD745 is my own personal IC Blowtorch, probably a reasonable portion of them ended up as RIAA's.
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