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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 online now 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?

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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 online now 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 Yesterday, 07:38 AM   #1075
Jim50hertz is offline Jim50hertz  United Kingdom
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Thanks Dennis

Will carry on
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