Article - Sony VFETs part 1

[permaneder]

PCB for CSX1 SONY VFET

I'll draw a PCB including an input buffer and onboard regulators (and the SITs and the MOSFETs on an L-profile to attach the whole thing directly to the heatsink, of course).

It may take a little while though, as I am a bit busy at the moment.

Here is a first proposal. The board measures 240mm*107mm. It bears all regulators an the input buffer. The jumpers J1 and J2 allow unbuffered balanced or buffered unbalanced mode.

Suggestions on improvements are welcome.

 

[PKI]

Looks great! 🙂 thanks!

 

[Zen Mod]

Wakoo German Cloning Team

 

[6c4c]

Ok, maybe I have to compare them myself.

 

[Botte]

Excellent, I'll take a pair 🙂

 

[WalterW]

Wow, looks very nice indeed. Is that for a Fischer L-profile? 178mm long, 5 mm thick?

 

[Soundhappy]

Hi Permaneder
Beauty PCB work congratulation !
Best regards 🙂

 

[6c4c]

I plan to use 4 heatsinks like these for both channels (each heatsink for one transistor):

They are 115x125x135mm and 0.5 deg.C/W rated. Or maybe two heatsinks is enough (one for both transistors), because 1.5A*46V*0.5deg.C/W=34.5deg.C above ambient. So, in worst case, heatsink temperature is about 70deg.C, or 70 - is very high?

 

[Zen Mod]

very high

 

[permaneder]

Wow, looks very nice indeed. Is that for a Fischer L-profile? 178mm long, 5 mm thick?

It is an Aluminium L-profile 40mm*40mm*240mm@5mm thickness available nearly everywhere (in Germany at least).

 

[WalterW]

70C is very high, I always aim for max 55- 60C sink temperature.

Is the room temperature 35C in Russia?🙂

 

[Zen Mod]

It is an Aluminium L-profile 40mm*40mm*240mm@5mm thickness available nearly everywhere (in Germany at least).

yup

every Hausfrau is having 3 stuck of 1m around , just in case of amp building urge

 

[WalterW]

It is an Aluminium L-profile 40mm*40mm*240mm@5mm thickness available nearly everywhere (in Germany at least).

Ah, thanks! So no Fischer....
Then I have to take a look at 'Hornbach' 😀😀😀

 

[WalterW]

yup

every Hausfrau is having 3 stuck of 1m around , just in case of amp building urge

😛😀😀

 

[permaneder]

yup

every Hausfrau is having 3 stuck of 1m around , just in case of amp building urge

I do know some Hausfrauen who don't, they are an absolute minority yet... 😉

 

[generg]

I looked around the pcb in comparison to the scheme.

Great that permaneder also did the work for the two xformers from Jensen.

I did not find a fault, only short irritation was the position of the 3k3 in the lower Gate bias circuit this time in the negative branch….. 🙂
I think Nelson did it for cosmetic reasons……🙂

Please some more people for check…..!

😀

 

[flocchini]

Here is a first proposal. The board measures 240mm*107mm. It bears all regulators an the input buffer. The jumpers J1 and J2 allow unbuffered balanced or buffered unbalanced mode.

Suggestions on improvements are welcome.

Please put me down for 4
Thanks

 

[PKI]

Well, if it is not clear from my previous post, I would take two as well, please 🙂

 

[WalterW]

I looked around the pcb in comparison to the scheme.

Great that permaneder also did the work for the two xformers from Jensen.

I did not find a fault, only short irritation was the position of the 3k3 in the lower Gate bias circuit this time in the negative branch….. 🙂
I think Nelson did it for cosmetic reasons……🙂

Please some more people for check…..!

😀

Only difference I see, is that you have a big 22000uF cap after the regulator. At first sight I thought is was before the regulator as part of the PSU.

 

[Nelson Pass]

I did not find a fault, only short irritation was the position of the 3k3 in the lower Gate bias circuit this time in the negative branch….. 🙂
I think Nelson did it for cosmetic reasons……🙂

I took a look and did not see an error. There is of course some range of
values which will do the job, in which case I try to minimize the purchasing
person's job.

I have known people who would spec a 10.2K ohm part where a 10K would do fine...

😎