F5 power amplifier - Page 153

estman · 27th July 2008, 10:44 AM

Quote:

and of course the PCB for comments

Please, take a close look to the D and S legs of Q3.

Nordic · 27th July 2008, 11:38 AM

Why? what are they doing?

estman · 27th July 2008, 11:52 AM

>Why?
To chek the connections to these legs.

>what are they doing?
They are imitating role of Source follower.

Nordic · 27th July 2008, 12:11 PM

Good catch, I see it now... I made an error on the schematic which translated to the PCB...

jackinnj · 27th July 2008, 12:16 PM

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.

Nordic · 27th July 2008, 12:25 PM

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...

Zen Mod · 27th July 2008, 01:18 PM

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" .

Audiofanatic · 27th July 2008, 05:50 PM

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

Zen Mod · 27th July 2008, 06:02 PM

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

lgabco · 27th July 2008, 06:44 PM

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.
Ladislav

27th July 2008, 06:44 PM	#1530
lgabco diyAudio Member Join Date: Nov 2006	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. Ladislav

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27th July 2008, 11:38 AM	#1522
Nordic diyAudio Member Join Date: Sep 2005	Why? what are they doing?

27th July 2008, 11:52 AM	#1523
estman diyAudio Member Join Date: Jan 2005 Location: Audio Valley	>Why? To chek the connections to these legs. >what are they doing? They are imitating role of Source follower.

27th July 2008, 12:11 PM	#1524
Nordic diyAudio Member Join Date: Sep 2005	Good catch, I see it now... I made an error on the schematic which translated to the PCB...

27th July 2008, 12:16 PM	#1525
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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.