F5X -- the EUVL Approach - Page 39 - diyAudio
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Old 30th July 2011, 12:32 AM   #381
ashaw is offline ashaw  Australia
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Please note that this is just the components, not the board. That will come later.
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Old 30th July 2011, 12:45 AM   #382
EUVL is offline EUVL  Europe
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Alexis,

I understand that you understand.
But others might get impatient and think that they should not miss the boat.
Only that the boat has not seen water yet, right out of the dock.
So not too many people on the trial run.

Patrick
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Old 30th July 2011, 08:12 AM   #383
JBdV is offline JBdV  Netherlands
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I would like to get 2 sets once Euvl and Ashaw have worked out the final number, hoping it will be 10 (else of course I will wait for the next and bigger GB.)
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Old 30th July 2011, 08:19 AM   #384
ashaw is offline ashaw  Australia
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The purchase was for 10 sets, 7 of those went to the testing team, the other 3 went to in less than 30 seconds. The people who got the components have got just exactly that, the components to go onto the board. This is jsut so people can get in early. The components are easily available from element14, excluding a bridge rectifier that can be bought from digikey and mouser, and the LED which has several online sources, and if you can handle red/green rather than red/blue can be bought from element 14 too. This was only to do with price.
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Old 6th August 2011, 05:24 AM   #385
EUVL is offline EUVL  Europe
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"400",

Please kindly confirm if you are home so that we can dispatch your GB MOSFETs.


Thx,
Patrick
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Old 11th August 2011, 06:41 AM   #386
EUVL is offline EUVL  Europe
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For those still hunting for 2SJ74BLs :

Toshiba 2SK170BL for sales


Patrick
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Old 11th August 2011, 06:43 AM   #387
EUVL is offline EUVL  Europe
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Once again the relationship between Idss of 2SK/2SJ with the 5R1 degeneration :

http://www.diyaudio.com/forums/attac...ntend-bias.png


Patrick
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Old 11th August 2011, 09:00 AM   #388
JBdV is offline JBdV  Netherlands
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wasn't someting like 7,2 mA IDSS and 8,1 mA the ideal pair for this amp?
I am not sure any more in what thread this can be found, may need to dig deeper tonight in my private time ...
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Old 11th August 2011, 09:25 AM   #389
EUVL is offline EUVL  Europe
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You need to get what you can get.

6-7mA Idss are rare for BL grade. Most of them are around 8-10mA.
That is why I give you a table so that you can pick what you can get your hands on.

The only difference is the amount of negative feedback, which is proportional to the drain resistor value.
That is, the smaller the Idss, the larger the Rd, the more NFB you get.
But load impedance also has a direct influence.

So for your purpose, anything from 6-9mA bias is OK.


Patrick
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Old 11th August 2011, 10:52 AM   #390
JBdV is offline JBdV  Netherlands
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I have pinged Spencer for a high quantity so we can cover all needs for the F5X builders
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