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14th January 2012, 09:32 PM
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#251 |
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diyAudio Member
Join Date: Mar 2009
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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 Induktivität, 09P, 5,6mH - Fest-Induktivitäten, radial bei reichelt elektronik The resistance is higher then i simulated but that is not particular critical. |
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14th January 2012, 09:38 PM
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#252 |
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diyAudio Member
Join Date: Oct 2003
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xen-audio.com |
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14th January 2012, 09:44 PM
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#253 |
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diyAudio Member
Join Date: Mar 2009
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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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14th January 2012, 09:45 PM
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#254 |
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diyAudio Member
Join Date: Mar 2009
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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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14th January 2012, 09:46 PM
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#255 |
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diyAudio Member
Join Date: Mar 2009
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Go to Feritkernspulen, Stiftkerne.
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14th January 2012, 09:52 PM
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#256 |
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diyAudio Member
Join Date: Oct 2003
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How about this :
07MFG-183J-50 Fastron Power Inductors http://www.fastrongroup.com/image-sh...uctType=series Patrick
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xen-audio.com Last edited by EUVL; 14th January 2012 at 09:58 PM. |
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14th January 2012, 09:56 PM
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#257 |
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diyAudio Member
Join Date: Mar 2009
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If i only knew what fL means. Is that the lowest frequency where it works ?
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14th January 2012, 09:59 PM
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#258 |
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diyAudio Member
Join Date: Oct 2003
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I think it is the frequency where the inductance is tested.
See here : http://www.fastrongroup.com/image-sh...seriesCategory Patrick
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14th January 2012, 10:07 PM
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#259 |
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diyAudio Member
Join Date: Oct 2003
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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. Patrick
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14th January 2012, 10:11 PM
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#260 |
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diyAudio Member
Join Date: Mar 2009
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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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