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Old 27th July 2008, 11:44 AM   #1521
estman is offline estman  Estonia
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Quote:
and of course the PCB for comments
Please, take a close look to the D and S legs of Q3.
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Old 27th July 2008, 12:38 PM   #1522
Nordic is offline Nordic  South Africa
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Why? what are they doing?
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Old 27th July 2008, 12:52 PM   #1523
estman is offline estman  Estonia
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>Why?
To chek the connections to these legs.

>what are they doing?
They are imitating role of Source follower.
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Old 27th July 2008, 01:11 PM   #1524
Nordic is offline Nordic  South Africa
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Good catch, I see it now... I made an error on the schematic which translated to the PCB...
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Old 27th July 2008, 01:16 PM   #1525
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You will probably want to be able to trim the values of the source resistors as NP has recommended. I used snippable DIP connectors to parallel the resistors.
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Old 27th July 2008, 01:25 PM   #1526
Nordic is offline Nordic  South Africa
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If it is in the thread I will find it (on page 16 now), sadly I don't have a copy of the magazine article...
Attached Images
File Type: gif pass_f5_v1_2.gif (28.2 KB, 1806 views)
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Old 27th July 2008, 02:18 PM   #1527
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Nordic
If it is in the thread I will find it (on page 16 now), sadly I don't have a copy of the magazine article...

well- you certainly didn't read what's on FW site ;

Papa sez :

"In addition to the normal owner's manual information, I have appended the original DIY F5 article which appeared in AX" .
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Old 27th July 2008, 06:50 PM   #1528
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Default F5 Pcb

Hi Guy's


This is my first trial of the F5 PCB from the one and only Nelson Pass.

I don't know if you guy's can open it. It's a jpg. (print screen copy) It's made with Ultiboard 5.71

All comments are welcome.


Thanks,


Audiofanatic
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File Type: jpg pcb.jpg (89.0 KB, 1749 views)
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Old 27th July 2008, 07:02 PM   #1529
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by juma
..................

juma - is this good enough ?

here shown without upper and lower gnd plane




my first pb , made with PC - ever !

Kicad proggie
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Old 27th July 2008, 07:44 PM   #1530
lgabco is offline lgabco  Slovakia
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Default for audiofanatic

it seems to me that distance from MOSFET to heatsink could be more than the length of the pins. Depends on the positions of PCB and heatsinks. Consider to move MOSFETS closer to the edge of the PCB.
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