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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 23rd May 2020, 12:55 PM   #1071
Rodeodave is offline Rodeodave  Austria
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Sony Vfet Illustrated build guide
Correct.

Q1 n-jfet k170
Q2 p-jfet j74

NPN for Q3 and PNP for Q4, so
ZTX450 for Q3 and ZTX550 for Q4

I can also confirm that Q5 (left position when looking at the pcb) must be P channel, so either 2SJ313 or FQP3P20. Q6 (right position) must be N channel, so either 2SK2013 or FQP3N30.
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Old 23rd May 2020, 01:40 PM   #1072
Dennis Hui is offline Dennis Hui  Canada
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Sony Vfet Illustrated build guide
Just be careful with the ZTX450/ZTX550 since the "round side" isn't as obvious
as with TO92 parts.

Since your jfets aren't installed yes, can you try measuring their Idss?
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Old 23rd May 2020, 02:27 PM   #1073
Jim50hertz is offline Jim50hertz  United Kingdom
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Thanks for verifying Rodeodave!

I think I've got the ZTX450/550 right, look ok Dennis?

I stuffed them before your post so they're now in the board. How do I go about testing IDSS?

Click the image to open in full size.

Click the image to open in full size.

Last edited by Jim50hertz; 23rd May 2020 at 02:40 PM.
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Old 23rd May 2020, 05:51 PM   #1074
Dennis Hui is offline Dennis Hui  Canada
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Sony Vfet Illustrated build guide
Looks fine.

Since the jfets are already in the boards, just continue on.
You can find out the Idss during power up when by measuring the
voltage across R35/R34.
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Old 24th May 2020, 07:38 AM   #1075
Jim50hertz is offline Jim50hertz  United Kingdom
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Thanks Dennis

Will carry on
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Old 28th May 2020, 02:11 AM   #1076
hirscwi is offline hirscwi  United States
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Sony Vfet Illustrated build guide
I'm getting ready to build one of these amps. I have the boards from the DIY store but the "T" brackets are no longer available. I can make some but it would be helpful if there's a drawing that shows the location of the holes. I'm sure I can determine it but am being lazy and thought I'd ask.
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Old 28th May 2020, 04:24 AM   #1077
Rodeodave is offline Rodeodave  Austria
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I don't think there's a drawing available. You could simply use the pcb as a stencil though.
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Old 28th May 2020, 05:56 AM   #1078
RainfallSky is offline RainfallSky  Russian Federation
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Quote:
Originally Posted by hirscwi View Post
I'm getting ready to build one of these amps. I have the boards from the DIY store but the "T" brackets are no longer available. I can make some but it would be helpful if there's a drawing that shows the location of the holes. I'm sure I can determine it but am being lazy and thought I'd ask.
Here.
I saved them from this thread.
Though I think holes for mounting bracket to UMS heatsinks should be 3mm.
Attached Files
File Type: pdf DIY BRACKET.pdf (13.8 KB, 27 views)
File Type: pdf DIY_TO3_BRACKET_REV_1.pdf (12.4 KB, 29 views)
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Old 28th May 2020, 09:26 PM   #1079
hirscwi is offline hirscwi  United States
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Sony Vfet Illustrated build guide
Quote:
Originally Posted by RainfallSky View Post
Here.
I saved them from this thread.
Though I think holes for mounting bracket to UMS heatsinks should be 3mm.
Thank you very much.
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Old 28th May 2020, 09:28 PM   #1080
hirscwi is offline hirscwi  United States
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Sony Vfet Illustrated build guide
I will be using K60 and J18 VFETs. Is it satisfactory to measure the Vgs using a Peak Atlas DCA75 or am I better to use the approach diagrammed by Mr. Pass?
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