dac I/V convertion with very low distortion - Page 34 - diyAudio
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Old 24th August 2012, 11:29 AM   #331
smms73 is offline smms73  Portugal
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Default HI-ZEN

Another one ( HI-ZEN )

distortion 0.000022% at 8ma pp 10khz

V3 and V4 will be a complementar Vbe multiplier.

I like this one
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File Type: jpg HI_ZEN.jpg (285.3 KB, 266 views)
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Last edited by smms73; 24th August 2012 at 11:31 AM.
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Old 24th August 2012, 11:34 AM   #332
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Quote:
Originally Posted by Joachim Gerhard View Post
Circuit ideas are popping up here like flowers in spring ! I really have fun. This is very different then other threads where is only talk. I appreciate it.
Enjoy the spring while it lasts, because the gardener has to go back to other projects
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Old 24th August 2012, 11:42 AM   #333
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A paper that i find yesterday By Malcom Hawksford

http://www.essex.ac.uk/csee/research...%20cascode.pdf
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Old 24th August 2012, 05:22 PM   #334
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0.00005% 10khz 8ma-pp 500ohm input 0,5v rms out

this use BISS transistores from nxp, very good for low inpedance input.

Datasheet:

http://www.nxp.com/documents/data_sheet/PBSS302NZ.pdf
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Old 24th August 2012, 05:29 PM   #335
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Quote:
Originally Posted by smms73 View Post
0.00005% 10khz 8ma-pp 500ohm input 0,5v rms out

this use BISS transistores from nxp, very good for low inpedance input.

Datasheet:

http://www.nxp.com/documents/data_sheet/PBSS302NZ.pdf
Whoa! cascoded darlingtons! cool! I like this one a lot!

I don't think you need C1 if you are operating in class A.
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Old 24th August 2012, 05:32 PM   #336
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I worked with Malkolm in the 90th. I know his work well.
This BISS transistors are really special. Not much voltage they can stand but a lot of current !
I would still try one of your circuits an an input stage for a phono. I could not stabilize the first circuit i made. What do you recommend i could try ?
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Old 24th August 2012, 05:35 PM   #337
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I came up with this a few weeks ago. Performance is not that good, but maybe it just needs some different transistors. I'm not experienced enough to know for sure.
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Old 24th August 2012, 05:41 PM   #338
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One thing that i like in the ZEN style is the way the output capacitor (c6) serves to limit the band of the amplifier and to stabilize all the circuit.
It need a good power supply.
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Old 24th August 2012, 05:46 PM   #339
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Quote:
Originally Posted by Joachim Gerhard View Post
I worked with Malkolm in the 90th. I know his work well.
This BISS transistors are really special. Not much voltage they can stand but a lot of current !
I would still try one of your circuits an an input stage for a phono. I could not stabilize the first circuit i made. What do you recommend i could try ?
I think you should try snubbers, there are some examples in some of the circuits i post. try the nodes that i call UP and DOWN, or at the input, but it help if you post a circuit.
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Old 24th August 2012, 05:48 PM   #340
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OK, i will do that, what i have.
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