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Old 3rd July 2011, 11:25 AM   #261
EUVL is offline EUVL  Europe
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Dear all,

I have an emergency at home and will be off for at least 2 weeks.
Fitzfish and MarkLai will take over the project from now on till further notice.

Sorry for that,
Patrick
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Old 3rd July 2011, 02:59 PM   #262
Horio is offline Horio  United States
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No problem at all Patrick.

Wish you the best of luck with things at home.
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Old 8th July 2011, 12:15 AM   #263
EUVL is offline EUVL  Europe
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Just a short message between hospital visits :

We have matched all regulator MOSFETs and will ship them in the next 5-10 days.

The mean Vgs for 2SJ618 at 4A is -2.79V, that for 2SK3497 is 2.56V.
There is not one single N-P pair of FETs where the P device will match the N device.
But N-N, P-P pair match is much better than 10mV in almost all cases.
For regulator use, this is totally overkilled, since the output voltage determining Zener diode has much more tolerance.

The P-N mismatch can be easily overcome by buying a bunch of Zener diodes and cherry picking.
Fitzfish will demonstrate this with an example in his test build report later.


Patrick
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Old 8th July 2011, 12:28 AM   #264
EUVL is offline EUVL  Europe
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For those interested a picture of our quick & dirty computer-controlled matching station.
Matching was done at 4A (exactly as in circuit), 5 readings for each device.


Patrick
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File Type: jpg matching-setup-20110705 s.jpg (676.1 KB, 677 views)
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Old 8th July 2011, 07:31 AM   #265
JBdV is offline JBdV  Netherlands
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I guess there will still be more F5X builders like me who didn't join this GB.
Will there be another one ?
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Old 8th July 2011, 10:03 AM   #266
EUVL is offline EUVL  Europe
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Why not organise your own ?
Matching is not complicated in this particular case (MOSFET follower regulator).


Patrick
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Old 8th July 2011, 10:18 AM   #267
JBdV is offline JBdV  Netherlands
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how may builds of the 25 would still need this ?

Jan
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Old 8th July 2011, 01:08 PM   #268
APK is offline APK  United Kingdom
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me for one

Tony
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Old 8th July 2011, 01:10 PM   #269
ashaw is offline ashaw  Australia
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Me also
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Old 8th July 2011, 01:34 PM   #270
EUVL is offline EUVL  Europe
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Enough reason to start a new GB thread ?

Patrick
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