DIY Sony VFET pt 2 (N-Channel Build)

[bbm3]

No P car in my stable at the moment but I do have another V err 12

 

[Zen Mod]

well, it's rude having Talian sport bike, German sport car , and VFet amp

 

[myleftear]

We‘re all rude one way or another…
(Talian bike/biciclette, germanium biguns etc)

 

[MEPER]

How rude is this?
Jaguar XJ13 - Wikipedia

Probably can't say I own it but we have been less than 1m apart.......

 

[rif]

Well then this isn't going to help my cause.

You could really upset people by using the vfet as your car stereo...

 

[nicoch58]

that's just DC-DC ...or 3 battery in series

 

[Zen Mod]

Ducati, with Guzzi sidecar, containing 3pcs of 12V/140Ah, feeding pair of Tannoy small Reds, one front, second back

 

[Franz Gysi]

Crude, isn't it?

 

[aphileneil]

worth a try - replace 4N35, check resistors connected to it

if that isn't helping, remove mosfet and check it with simple matching jig

all in hope that VFet is ok, and fact that you can vary output node voltage is implying that, same as that biasing parts are OK

just to amuse us, post proper macro pic of Dodo channel pcb

 

[Zen Mod]

and?

 

[aphileneil]

Hi, I've replaced the optocoupler and socketed it. No change in measurements or performance. Next to change the MOSFET but they're hard to get so will take a few days.
pics

 

[Zen Mod]

mosfet - test it first

or place any of IRFP N channel you have around, just slab it somewhere on heatsink with any insulation pad and connect with wires to pads

IRFP150, IRFP 240 will do the job

edit: you can revisit some of these solder joints (trimpot)

especially gray wire from beneath looking fishy, even if from upper side it looks fine; certainly is just ugly but still functional ..... but avoiding ugly in soldering is good practice - leading to higher level of reliability

 

[bbm3]

I got off Topic with Internal Combustion Engine Banter

VFet N-Channel Update:

I believe I have found my audio nirvana.
Decades of messing around, countless dollars spent,
and a closet full of audio gear, here I am.
The lucky recipient of a "simple" ~10 WPC class A toaster.
My Goodness, this thing is special.

John Lee Hooker with Carlos Santana playing as I type this makes me smile.

 

[Zen Mod]

I'm happy that you're happy

 

[bbm3]

I'm happy that you're happy

Cheers to you as well Sir.

 

[Enochrome]

Now that's sexy.

Thank you, sir!!!

 

[Enochrome]

try direct to a dac ....pc volume

The only other preamp I have is Schiit Saga S, which is passive/buffer which I might try, but I think the amp needs a little gain help.

 

[Enochrome]

I wonder what the wrench was used for (on top on Luxman).

Right before I hooked up the interconnects, I noticed one of the RCA jacks was loose. Don't want to cause any unnecessary noise out of my Yamaha NS1000, those drivers are hard to replace.

 

[Enochrome]

Volume?

 

[rif]

The only other preamp I have is Schiit Saga S, which is passive/buffer which I might try, but I think the amp needs a little gain help.

I think you can run the Saga as a normal preamp, with gain.