Sony VFET Amplifier Part 2

[Soundhappy]

I am building. I worked on my case last week. I bought the heatsinks almost a year ago for this build. It is what is called redneck engineering in the deep south but it will be functional. I should start stuffing boards next week.

I am putting the V-fets on top of the brace per the V-fet #1 article with the board on the underside of the brace. I believe this is the correct way. The brace is wider on one side that the the other. Does anyone know which side goes up. I figured I will figure it out from the pinouts of the V-fets and traces on the boards if no one speaks up. Being that the pins of the V-fets only line up one way it should be easy enough figuring it out. But advice and experience is always welcome.

 

[vanofmonks]

painstakingly hand-matched and sequentially arranged over 1,000 VFETS... Calling that a legendary effort would be an understatement

Can we officially name it:

The Legendary Beast of a Thousand VFETS

I think that would only be appropriate, and it does still need a name right?

 

[Nelson Pass]

Maybe this picture will help.

 

[vanofmonks]

Any chance of getting Keratherm insulators made for the bracket to heatsink interface and the VFETS?

 

[Soundhappy]

Maybe this picture will help.

Thanks Mr Pass

Yes will help a lot

 

[Soundhappy]

Any chance of getting Keratherm insulators made for the bracket to heatsink interface and the VFETS?

If not too late try this link :

http://www.diyaudio.com/forums/group-buys/285807-ic-keratherm-86-82-3-insulators.html

Good luck

 

[dady]

There are no big power heating for dissipation, use mica and grease.
It's works since long time ago.

 

[vanofmonks]

If not too late try this link :

http://www.diyaudio.com/forums/group-buys/285807-ic-keratherm-86-82-3-insulators.html

Good luck

Yeah, I'm in that one, but looks like it died. Also, no sheet for the bracket to heatsink interface.

 

[noelectrix]

no sheet for the bracket to heatsink interface.

guess you don´t need any, just grease

stefan

 

[wdecho]

Many thanks Nelson, a picture is worth a thousand words.

 

[noelectrix]

Many thanks Nelson, a picture is worth a thousand words.

a VIDEO with the little vfet playing on nelsons cathedrals would be (useless because of video quality) but a phantastic entertainment : )

stefan

 

[bk856er]

Maybe this picture will help.

Can someone please share the PN for the Q5/Q6 heatsink in the pic?

BK

 

[wdecho]

That would be nice. The heatsinks I ordered are not that big. I forgot to get them actually when I placed my order online at Mouser and quickly called them and had some put on the order before they started filling it. I then ordered some on Ebay that are somewhat larger but not as big as the ones Nelson is using. With some diligence someone should be able to locate them.

 

[Soundhappy]

Also, no sheet for the bracket to heatsink interface.

Oops
Keratherm are available in biger square foil and you can cut to dimmension you need for perfect thermal bracket to heatsink contact.

Thermally conductive film 0.25 mm 6.5 W/mK (L x W) 190 mm x 190 mm Kerafol from Conrad.com

http://www.produktinfo.conrad.com/d...en-WAERMELEITFOL_86_82_ROT_190X190X0_25MM.pdf

 

[Nelson Pass]

Can someone please share the PN for the Q5/Q6 heatsink in the pic?

Aavid part. Digikey SKU is: HS193-ND

 

[bk856er]

Aavid part. Digikey SKU is: HS193-ND

Many thanks NP!

Equivalent Mouser PN: 532-551002B00G

BK

 

[Soundhappy]

Aavid part. Digikey SKU is: HS193-ND

I just was ask for the same and get response thx

...and for diyers who buy from Mouser

http://www.mouser.com/ProductDetail...ha2pyFadujD4TGsc%2bcoRTFgG9XrnVTibqlu45L/wkA=

 

[bk856er]

Another part question. Are P1-P4 Bourns single or multi-turn? Is there a preferred component series or PN?

BK

 

[gwrskien]

The ones in the pic in post #1608 look like Bourns 3386 series, single turn i think. Bourns 3296w are multi turn, and used in other Pass amps like F5t( 652-3296W-1-502LF at Mouser). Remember to check footprint if it fits.

 

[bk856er]

The ones in the pic in post #1608 look like Bourns 3386 series, single turn i think. Bourns 3296w are multi turn, and used in other Pass amps like F5t( 652-3296W-1-502LF at Mouser). Remember to check footprint if it fits.

Excellent - thank you. Seems to be the Bourns 3386P single-turn, with P designating the appropriate pin pattern.

Someone will correct me if that info is wrong.

BK