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Old 7th December 2009, 05:59 PM   #1
cviller is offline cviller  Denmark
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Default 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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Old 7th December 2009, 06:18 PM   #2
spind is offline spind  Canada
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Yes please!!!!! With a long, thin board like your new F5 board.

thanks!!
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Old 7th December 2009, 06:19 PM   #3
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I'm in for a pair please
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Old 7th December 2009, 06:35 PM   #4
cviller is offline cviller  Denmark
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Great!

I'm not finished with the layout, but it will be something like the attached.
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File Type: png f4.png (59.0 KB, 1241 views)
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Old 8th December 2009, 12:16 AM   #5
Arick is offline Arick  Canada
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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
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Old 8th December 2009, 05:53 AM   #6
cviller is offline cviller  Denmark
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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.
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Old 8th December 2009, 03:08 PM   #7
Arick is offline Arick  Canada
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Thank you very much for the information
Eric
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Old 13th December 2009, 08:53 PM   #8
cviller is offline cviller  Denmark
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Did a bit of cleanup on the pcb - any comments?
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File Type: png f4.png (112.9 KB, 1119 views)
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Old 13th December 2009, 10:04 PM   #9
cviller is offline cviller  Denmark
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Got one a comment on the silk screen... fixed here.
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Old 14th December 2009, 02:25 PM   #10
dodo is offline dodo  Poland
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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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