F5 power amplifier - Page 24

Babowana · 22nd April 2008, 01:26 AM

Quote:

Originally posted by jam

... hundred watt amp.

A Yo ... Bu Xing ...
I am trying to cook "F" ...
Tasteful "F" watts ...

Dougie085 · 22nd April 2008, 06:40 AM

Just curious you think there will be a group buy for a balanced version PCB? I'm quite interested. What's the rated output power on this amp? I had heard its rather efficient for a class A amp.

ben goh · 22nd April 2008, 06:45 AM

Have a God Blessed recovery, Nelson

apassgear · 22nd April 2008, 07:16 AM

Here is one way we could lay a one sided board for the F5 circuit based directly on Nelson’s schematic.

Still on the proofing stage so suggestions, discussion and corrections are welcomed.

Needing components to attach the blue LED that will be added soon so no nasty

for this omission please.

Nelson, thanks for sharing this wonderful amp that I’m sure will transcend time and be regarded as a classic.

Zen Mod · 22nd April 2008, 09:17 AM

Quote:

Originally posted by apassgear
Here is one way we could lay a one sided board for the F5 circuit based directly on Nelson’s schematic.

Still on the proofing stage so suggestions, discussion and corrections are welcomed.

Needing components to attach the blue LED that will be added soon so no nasty for this omission please.

Nelson, thanks for sharing this wonderful amp that I’m sure will transcend time and be regarded as a classic.

let jfets

each other hugs

free in the wind

Zayan · 22nd April 2008, 09:28 AM

Your PCB look nice!

I just have one comment. These 2 FETs will run so hot, can you increase the distance of them to around 6 inches.

Thanks,

Babowana · 22nd April 2008, 10:00 AM

Quote:

Originally posted by Zayan

... will run so hot, can you increase the distance of them to around 6 inches.

Yeah...

I often wonder why many of diyers here are not using the chassis space (or wide heat sink area) efficiently for better heat distribution. In general, they are eager to make the signal path as short as possible, and crowded layout with the components... But, at the cost of probable short FET-life, for what...? Better sound? Beauty? Anyone can explain?

jimbo51 · 22nd April 2008, 10:31 AM

Quote:

Originally posted by Babowana

Yeah...

I often wonder why many of diyers here are not using the chassis space (or wide heat sink area) efficiently for better heat distribution. In general, they are eager to make the signal path as short as possible, and crowded layout with the components... But, at the cost of probable short FET-life, for what...? Better sound? Beauty? Anyone can explain?

Could it be driven by the standard sizes economically available from the manufacturers of short run pcb's?

Compare the F4 board from PD with original layout per NP for instance.

TimS · 22nd April 2008, 11:03 AM

How about scaling the balanced design for more power.

Babowana · 22nd April 2008, 11:51 AM

Quote:

Originally posted by TimS

How about scaling the balanced design for more power.

Please remember that the JFETs you are considering to use
have maximum Vgds of 25V...

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22nd April 2008, 06:40 AM	#232
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Just curious you think there will be a group buy for a balanced version PCB? I'm quite interested. What's the rated output power on this amp? I had heard its rather efficient for a class A amp.

22nd April 2008, 06:45 AM	#233
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	Have a God Blessed recovery, Nelson

22nd April 2008, 09:28 AM	#236
Zayan diyAudio Member Join Date: Jun 2007	Your PCB look nice! I just have one comment. These 2 FETs will run so hot, can you increase the distance of them to around 6 inches. Thanks,

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