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Old 10th September 2010, 02:36 PM   #31
PA0SU is offline PA0SU  Netherlands
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You are kind of insulting a highly regarded designer .....


Pfuuuh... it seems to be real hot stuff!
BTW you have no idea about my design experiance, but if I am on the wrong tour......... I'm so sorry.

Herb.
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Old 10th September 2010, 04:29 PM   #32
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I think most of us here are not interested in opamps.
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Old 10th September 2010, 05:42 PM   #33
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Nelson Pass View Post
The Zen I/V Converter article is posted here at DIYAudio,
and I am establishing this thread for discussion.

At this moment, it seems to have lost the first diagram, that
of a typical inverting op amp with a virtual ground input,
but I'm sure that will be rectified shortly.

I have just seen the circuit.

My first thought. Wy did i not come up with that idear!

Nelson i am a bit envious! I have to say....

The only thing that bothers me is that the 2sj74 and and 2sk170 is difficult to get you hands on through newark, farnell, mouser and digikey.

But excellent and simple design.


PS: The input will be a virtual ground. Even if the feedback is high impedance.
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Old 10th September 2010, 05:46 PM   #34
frags is offline frags  Canada
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Sonnya,

You can easily find them on ebay.
30x P-Channel Silicon Transistor 2SJ74 J74 Low Noise BL on eBay.ca (item 220663540658 end time 02-Oct-10 09:06:10 EDT)

http://cgi.ebay.ca/50pcs-N-Channel-S...item1e5ba82924

Last edited by frags; 10th September 2010 at 05:49 PM.
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Old 10th September 2010, 06:03 PM   #35
sonnya is offline sonnya  Denmark
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Thanks for the info.

I maybe have a little "but".

R5 and C5. Should the not have been feed back to source instead of ground.
I think there is a little drawing failure,
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Old 10th September 2010, 06:10 PM   #36
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by sonnya View Post
Thanks for the info.

I maybe have a little "but".

R5 and C5. Should the not have been feed back to source instead of ground.
I think there is a little drawing failure,
Sorry i was'nt finished.

I know that you state no feedback and that mades it even more impressive regarding the performance curves. Feedback would rase the performance even more?!?!?! Nelson ?? Am i right or wrong?
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Old 10th September 2010, 06:11 PM   #37
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Hello Mr.Pass,

It is possible to have more detailed measurements for Zen I/V - harmonics levels up to 7th, the contamination spectrum, if possible?

You don't intend to use it for HD signals (such as 24/96 or 24/192) with provided FR, is it correct?
The FR can be adjusted by replacing the filter cap, if necessary, do you have any other samples of FR for different input signals, by any chance?
Thanks!

thanh1973
I am still interested in op amps (less for I/V stage of course), these for example are also op amps HD Audio Opamp

Last edited by Gordon McGregor; 10th September 2010 at 06:27 PM.
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Old 10th September 2010, 06:12 PM   #38
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Quote:
Originally Posted by regal View Post

Anyone have a Spice model for this up and running yet ?
FFT of 4V peak into 50k load
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File Type: png ZEN IV FFT.png (167.1 KB, 2008 views)
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Old 10th September 2010, 06:21 PM   #39
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Quote:
Originally Posted by thanh1973 View Post
FFT of 4V peak into 50k load
You missed 10K/4n7 on output , they are the load too!
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Svakog dana u svakom pogledu sve manje nazadujem.
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Old 10th September 2010, 06:26 PM   #40
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They are optional parts.

If you want me to post it I will but the results are virtually the same (ie 3/5 of FA)
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