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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 4th December 2017, 01:48 PM   #381
Rodeodave is online now Rodeodave  Austria
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And just to make sure it's getting repeated every now and then, I'll add that the Fairchild FQP3P20/FQP3N30 want about 4V Vgs to turn on, which requires 1k P3/P4.

Although, with your R5 and R6 releasing the magic smoke, you're likely having more than high enough Vgs...
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Old 4th December 2017, 03:29 PM   #382
baswamin is offline baswamin  India
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I am not sure I am reading this correctly but started at voltage of 50V implies +/-25V and not +/-50V?
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Old 4th December 2017, 03:42 PM   #383
Rodeodave is online now Rodeodave  Austria
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I think he's referring to the primary voltage set with the variac. 50V AC would be about half the usual main voltage in Canada (120V AV, 60Hz).
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Old 4th December 2017, 07:15 PM   #384
jaab6 is offline jaab6  Canada
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Thanks for the replies! i didn't know that p3 and p4 have to be turned down
I will see what's happen
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Old 6th December 2017, 07:43 PM   #385
jaab6 is offline jaab6  Canada
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I tried setting counterclockwise P3 and P4, and that doesn't change anything,
I verified the way I connected Q7 and Q8 and it seems OK. Finally I compared my work to the schematic instead the Supplemental kit list BOM (as i did because convenient!)
I found Q5 = 2SJ313 P chanel
Q6 = 2SK2013 N chanel
but in the Supplemental kit list
Q5 = 3N30 N chanel
Q6 = 3P20 P chanel

I'm wondering if the fact of having inverted them they can have been damaged? or is ok and i have just to switch them?
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Old 6th December 2017, 08:49 PM   #386
2 picoDumbs is offline 2 picoDumbs  Australia
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Haven't looked at the circuit diagram or exactly what your problem is but you should be aware that the fairchild mosfets need more voltage than the toshibas to turn on.
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Old 6th December 2017, 09:03 PM   #387
wineds is offline wineds  Australia
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Quote:
Originally Posted by jaab6 View Post
I tried setting counterclockwise P3 and P4, and that doesn't change anything,
I verified the way I connected Q7 and Q8 and it seems OK. Finally I compared my work to the schematic instead the Supplemental kit list BOM (as i did because convenient!)
I found Q5 = 2SJ313 P chanel
Q6 = 2SK2013 N chanel
but in the Supplemental kit list
Q5 = 3N30 N chanel
Q6 = 3P20 P chanel

I'm wondering if the fact of having inverted them they can have been damaged? or is ok and i have just to switch them?
Yes I think an early version of the BOM had an error like this in it.
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Old 6th December 2017, 09:34 PM   #388
Rodeodave is online now Rodeodave  Austria
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Corrected BOM in post #2766 of the DIY Sony VFET pt2 thread: Sony VFET Amplifier Part 2

On the pcb Q5 (left position) is supposed to be P channel, so either 2SJ313 or FQP3P20. Q6 (right position) is supposed to be N channel, so either 2SK2013 or FQP3N30.
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Old 9th December 2017, 09:24 PM   #389
delecoy is offline delecoy  United States
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Default Soooo close

Power supply all wired up. 31.5 volts with no load. Excited
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Old 9th December 2017, 09:28 PM   #390
Zen Mod is offline Zen Mod  Serbia
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tidy up that CL60
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