Sony VFET Amplifier Part 2

[stefanobilliani]

I should make a correction to that comment:

The real Sony's have a ring around the bottom, the fake parts are flat or have a shape like the one shown in the photo.

In both pictures, the real part is on the right.

That's great news then .
Thanks Mike

 

[Soundhappy]

Soundhappy, you have the same lab PSU's as I,
you can limit the current of those to say: 0.6 - 1.0 Ampere.
That way you can never blow your precious diamond

@ WalterW and Diyers

After Vgs DUT Vfet schematic i try mesured Vgs but voltage across 1R don't change
if i tourn trimmer it is because limit max 1 A the current on psu or something else ?
Thanks for your answer

 

[WalterW]

? strange, do you have voltage across the 1 Ohm resistor? Say 1 Volt then the current limiter is doing it's job. Or don't you measure any voltage across the 1 Ohm?
Pictures maybe?

 

[Michael Rothacher]

That's great news then .
Thanks Mike

Everything from Acronman CircuitDIY is the real deal.

I bought the fake parts from shifty Ebay sources

 

[Soundhappy]

Pictures maybe?

@WalterW

That my chance WalterW you are on line
Voici the pictures with voltages connections verified ok.
Greetings

 

[Gyuri]

Hm, I don't have money for fake parts.
Actually, I don't have even for genuine parts.
I must have had to buy new tyres for my car.
It had two uncomfortable car rides, up to the hilt worn winter tires, in heavy rains.
So I promised myself when I get home safe and sound, to buy tires for the car.
There are priorities, unfortunately.
After all so I will have a chance to build something, in the future.

 

[WalterW]

I see only 1 LAB PSU, where is the other?

 

[WalterW]

See what I mean :

 

[Soundhappy]

I see only 1 LAB PSU, where is the other?

Oops i have only one lab psu but i can build quickly separate bias circuit
with 15 v transformer ,bridge, caps , 7912, resistors
Is ok ?

 

[WalterW]

Yep, but 12 volt from 7912 can be too low, or better use two 9 volt batteries in series for the bias, much easier.

 

[Soundhappy]

Psu have (+) and (-) polarity green ground was in my interpretation (0) point on schematic but ok i was wrong...
so now i need separate 19V bias (-) and other19V (+) on drain yes ?
What is (0) point ? Common of multimetre yup ?
Thanks WalterW

 

[FatFreddy]

@WalterW

That my chance WalterW you are on line
Voici the pictures with voltages connections verified ok.
Greetings

Hi Soundhappy, It looks like you have the bench supply set to constant current mode instead of current limiting which is limiting the voltage to 2.1V. I am not familiar with that supply so could be wrong.

 

[WalterW]

Soundhappy try it this way:

 

[Soundhappy]

Soundhappy try it this way:

@ WalterW

Thanks a lot
All is clear so i limit current on psu to 1A to protect vfet dut.
0V is (-)(+) node point not common of multimeter or something else
i was " funny"
Yes i try this one with better understanding.
Good evening

 

[WalterW]

Good evening!
I'm leaving for holidays tomorrow, hope they have WIFI in Croatia, so I can read the forum in the evening, when kids are to bed

 

[Soundhappy]

Good evening!
I'm leaving for holidays tomorrow, hope they have WIFI in Croatia, so I can read the forum in the evening, when kids are to bed

Holidays in Croatia just few steps from Zen Mod Serbian Ranch
Take care this is X amplifiers countrys zone btw interesting destination

 

[abadsantos 7]

Good evening!
I'm leaving for holidays tomorrow, hope they have WIFI in Croatia, so I can read the forum in the evening, when kids are to bed

Hi Walter,

When the kids are on bed, Drop the Wifi and do something else...ha ha ha... Enjoy your Holiday...

BTW...my another lab PSU arrived and just waiting for the heat sink and Im good...


@ Soundhappy....be careful in matching, make sure you have the Vgs set to max before you turn on your main PSU...

Cheers..

 

[dady]

Hey Christoph, Some time you can came here to Menorca, this year is full of Frenchy people here. I bettering my Frances ici.
And rest of the gentlemen, look at in google my place(Punta Prima, Menorca) you could not believe this incredible place in the world, you are invited here, anytime.

An externally hosted image should be here but it was not working when we last tested it.

 

[HVfanatic]

Hi,

did anyone try these?

Aliexpress.com : Buy SONY 2SK82 V FET from Reliable fet transistors suppliers on Eternal HONG's store | Alibaba Group

Are they fakes?

Regs, Dirk

 

[Soundhappy]

Hey amigo Esteban
Woow yeah very beauty & kind but i have fabulous sea
around me all the year long with all beaches in my departement
logicaly i dream more about holiday on the Alps mountains tops
and i work for winter ready Vfet class A
but it's sunday let's go on Pamela beach now