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-   -   Gb: F4 pcb (http://www.diyaudio.com/forums/group-buys/156363-gb-f4-pcb.html)

cviller 7th December 2009 05:59 PM

Gb: F4 pcb
 
Hi All,

I have been asked quite a few times if I had any F4 boards available or if I would do a GB. So after having enjoyed doing the http://www.diyaudio.com/forums/group...gb-f5-pcb.html, I could just as well make some F4's. ;)

In this thread, I would like to hear if people would be interested in such a GB.

Here is the service manual btw:
http://www.firstwatt.com/downloads/f4_om.pdf

Christian

spind 7th December 2009 06:18 PM

Yes please!!!!! With a long, thin board like your new F5 board.

thanks!!

specialidiot 7th December 2009 06:19 PM

I'm in for a pair please

cviller 7th December 2009 06:35 PM

1 Attachment(s)
Great! :D

I'm not finished with the layout, but it will be something like the attached.

Arick 8th December 2009 12:16 AM

I have two questions:
1) Do you have a cost estimate?
2) How many boards are required to make a fully balanced amp?
Thank you
Eric

cviller 8th December 2009 05:53 AM

If you want to make a fully balanced amp you'll need four channels - four boards.
The board is larger than the F5, so I think I have to set the price at $9 per board.

The board will be 230x50 mm and the spacing between the mosfets is 4cm.

I have a Group Buy status page here, ready for paid sign-ups.

Arick 8th December 2009 03:08 PM

Thank you very much for the information :)
Eric

cviller 13th December 2009 08:53 PM

1 Attachment(s)
Did a bit of cleanup on the pcb - any comments?

cviller 13th December 2009 10:04 PM

1 Attachment(s)
Got one a comment on the silk screen... fixed here.

dodo 14th December 2009 02:25 PM

i'm not an expert as far as pcb layout is concerned , but don't you think the input jfet pair is far to close to the power trany and radiator as well?
those jfets aren't zero tempoco
I would try to move them away from power trany as much as you can


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