Gb: F4 pcb

cviller · 7th December 2009, 05:59 PM

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 Gb: F5 Pcb, 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

Great!

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

Did a bit of cleanup on the pcb - any comments?

cviller · 13th December 2009, 10:04 PM

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

7th December 2009, 05:59 PM	#1
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	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 Gb: F5 Pcb, 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

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7th December 2009, 06:18 PM	#2
spind diyAudio Member Join Date: Feb 2003 Location: Winnipeg	Yes please!!!!! With a long, thin board like your new F5 board. thanks!!

7th December 2009, 06:19 PM	#3
specialidiot diyAudio Member Join Date: Apr 2008	I'm in for a pair please

8th December 2009, 12:16 AM	#5
Arick diyAudio Member Join Date: Dec 2008 Location: Montréal	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

8th December 2009, 05:53 AM	#6
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	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.

8th December 2009, 03:08 PM	#7
Arick diyAudio Member Join Date: Dec 2008 Location: Montréal	Thank you very much for the information Eric

14th December 2009, 02:25 PM	#10
dodo diyAudio Member Join Date: Dec 2004 Location: Bydgoszcz , small town in Poland	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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