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Old 15th September 2008, 05:45 PM   #21
tomat is offline tomat  Indonesia
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Hi
i'm interest to order ,how is the way ? ,i was sent you email about two days ago but not get a reply.
can you tell me the difference of new SUN with the older version? and the MOON also

thanks
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Old 16th September 2008, 12:36 AM   #22
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Default Helo!

I will reply every email,
It seem I have not received your email.
When I received your email, my mailbox will send a reply email automatic, and I will send another reply in 24 hours.

About SUN(version 2),We thought about some customers feedbacks , then we have in allusion to adjust the circuits and parts*, improve and made OPA-SUN (version 2), OPA-SUN (v2) had more humanity than original , but keep energetic, huge dynamics and good impulse response.

Moon:This discrete opamp uses dual differential*gain stage and single ended output stage circuit design , we try and listen long term . The OPA-Moon sound characteristics is had a bit tubelike taste (vacuum valve) , soft and thick .
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Old 10th October 2008, 01:12 PM   #23
jam is offline jam  United States
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Rudiger,

Could you share more information on the distortion differences with the cascode. Any differences in bandwidth?

Thanks,

Jam
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Old 10th October 2008, 01:29 PM   #24
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-3dB BW is around 8Mhz witout c, and *worse* with cascoding (5Mhz)
3rd and higher order harmonics rise at an order of magnitude, 2nd is the same (and dominating).
all simulated.
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File Type: gif cascbuf.gif (16.0 KB, 860 views)
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Old 10th October 2008, 02:24 PM   #25
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oops..

but this one is an order of magnitude *better* EDIT: only with high freq (20k), 20Hz is still better without cascode!

Just an simulation trick without any connection to the real world?

Rüdiger
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File Type: gif better_cascbuf.gif (17.7 KB, 844 views)
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Old 11th October 2008, 10:20 AM   #26
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Would these be a direct drop in replacement for an OP27 or 37? or are they dual only?


Fran
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Old 11th October 2008, 10:58 AM   #27
jam is offline jam  United States
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Rudiger,

Thanks. This is useful information.

Jam
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Old 20th September 2012, 04:02 PM   #28
RNMarsh is offline RNMarsh  United States
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you need to put the 14K to the source instead of the output. -RNM
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