Anybody using the new ESS Vout DAC (ES9022)? - Page 26 - diyAudio
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Old 14th January 2012, 09:32 PM   #251
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I would say Tietze-Schenk. This circuit is as old as N-Channel Fets. I assume somebody did it with tubes ages ago.
I am searching for inductors that could work. For example two of this in series.
They are available with 12mH too but then the self resonance is lower.09P 5,6M - Stehende Induktivitšt, 09P, 5,6mH - Fest-Induktivitšten, radial bei reichelt elektronik
The resistance is higher then i simulated but that is not particular critical.
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Old 14th January 2012, 09:38 PM   #252
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Would this do for the L ?

ROXBURGH|CMV10|INDUCTOR, 18MH, 1A | us.element14.com


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Old 14th January 2012, 09:44 PM   #253
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No, they are not wide band enough. We need a core material that is good to at least 20kHz. There are materials that are good at high frequency for switch mode supplies for example but they are no good at audio frequencies. This is difficult.
We could ask Haufe, Pikatron, Sowter, Lundahl or Jensen but then it gets expensive.
I pay 100,-$ for a 24mH audio inductor from Sowter.
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Old 14th January 2012, 09:45 PM   #254
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This ones could work but they are not shielded.http://www.mundorf.com/deutsch%201.1/spulen-kern.htm
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Old 14th January 2012, 09:46 PM   #255
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Go to Feritkernspulen, Stiftkerne.
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Old 14th January 2012, 09:52 PM   #256
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How about this :

07MFG-183J-50 Fastron Power Inductors

http://www.fastrongroup.com/image-sh...uctType=series


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Last edited by EUVL; 14th January 2012 at 09:58 PM.
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Old 14th January 2012, 09:56 PM   #257
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If i only knew what fL means. Is that the lowest frequency where it works ?
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Old 14th January 2012, 09:59 PM   #258
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I think it is the frequency where the inductance is tested.

See here :
http://www.fastrongroup.com/image-sh...seriesCategory


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Old 14th January 2012, 10:07 PM   #259
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So rated L at 20kHz, rated Q at 59kHz, and self resonance at 525kHz.
Seems quite OK (not perfect), and not expensive.


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Old 14th January 2012, 10:11 PM   #260
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Yes, that could work. Worth a try. The circuit has to be measured then if there is any problem. The coil has to be put in a small Mumetall container.
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