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Old 31st December 2017, 01:24 AM   #91
EUVL is offline EUVL  Europe
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PCB not expensive enough, I think.


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Old 31st December 2017, 08:39 PM   #92
Stixx is offline Stixx  Germany
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In the process of building one right now...
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Old 19th January 2018, 02:44 PM   #93
dabore84 is offline dabore84  Netherlands
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What alternative can I use for Beyschlag MMB 0207 1R 1%? I wanted to use the one rated for 1Watt, but no one has them in stock for the next 69 weeks. Only the lower rating 0.4W is available MMB02070C1008FB200
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Old 19th January 2018, 02:47 PM   #94
EUVL is offline EUVL  Europe
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Any 1206 SMD resistors will also fit the pads on the PCB.


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Old 11th February 2018, 05:49 PM   #95
EUVL is offline EUVL  Europe
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Thanks to help from Morde, I curve traced the Renesas 2SK1058/2SJ162, as well as the Exicon ECX10N20 & ECX10P20.
According to datasheets, they should be almost direct replacements.
But apart from Vgs differences, which can vary between FETs, there are also visible differences in Yfs.

Here are some typical results at 500mA bias :
2SK1058 Vgs 1.685 Yfs0.626
2SJ162 Vgs -1.379 Yfs 0.548

ECX10N20 Vgs 0.964 Yfs 0.999
ECX10P20 Vgs -1.423 Yfs 0.885

For the curves,
red is 2SK1058
black is 2SJ162
green is ECX10N20
blue is ECX10P20


Cheers,
Patrick
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File Type: png Renesas Laterals.png (12.1 KB, 193 views)
File Type: png Exicon Laterals.png (11.7 KB, 186 views)
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Old 17th February 2018, 08:08 PM   #96
Nikon1975 is offline Nikon1975  Austria
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Patrick,

Am I doing something wrong or the Beyschlag MMB 0207 are too short for the pads. It looks like there should be through hole resistors there.

Thanks,

D.

P.S.: I started building it.
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Old 17th February 2018, 10:54 PM   #97
EUVL is offline EUVL  Europe
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I guess you are referring to source resistors of the output stage ?

There is some confusion with the numbering :
https://www.vishay.com/docs/28768/mb_vg06.pdf
But I thought it was obvious from the pictures that they are leaded.


Terribly sorry for that,
Patrick
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