F5 pcb group buy... - Page 5

gil-garcia · 8th April 2009, 10:13 PM

Thanks korben,

As j do not kwow what is dead or not, j have ordered new pcb and will change all componants.

Now j check the bom.

It was the first time j did not sucess

samoloko · 9th April 2009, 05:47 PM

Peter

on your F5 pcbs there is 2 holes for the gnd which can be used for say In and out gnd
but where to connect gnd from rails

Peter Daniel · 9th April 2009, 07:38 PM

There are 2 gnd pads: one for RCA input, the other to connect with main filter caps. The output gnd is not taken from amp board (as it wouldn't make much sense) but from a common point on main filter caps.

samoloko · 10th April 2009, 05:48 AM

thx

when you do Initial set up - Is It Important to short Input to gnd

are you happy with sound of your F5
what bias you set 1.3 or high

Peter Daniel · 10th April 2009, 03:06 PM

It is recommended to short the input, however, I did all my testing with input open and it worked equally fine. I used 1.3 amp bias, the heatsinks allow for more, but I'm not really crazy about pushing it.

Yes, I'm happy with a sound of F5 and that's the amp I'm presently using in a basement system.

Please see attached pic for my current setup. As mentioned earlier, the amps are behind the separating wall, in which Fertin drivers are installed. You will see battery driven (charger permanently in parallel) field coil supply.

There is no power switch directly on the amp, I installed it in a special housing on near cabinet wall.

Peter Daniel · 10th April 2009, 03:10 PM

The other channel looks very similar:

JoshK · 10th April 2009, 08:13 PM

Quote:

Originally posted by Peter Daniel

... but since the shipping is already included in the price of the boards, you may as well order them online.

Maybe I am blind, but I looked on your website and I don't see a place to order F5 boards. I would like a pair of the boards if you got 'em. However you'd like me to order them, I'm game.

Peter Daniel · 10th April 2009, 08:19 PM

This is not my design, so I'm not selling them from my website, you can get the boards only through this Forum.

The instructions to purchase were explained in a first post of this thread: http://www.diyaudio.com/forums/showt...89#post1771389

markdonnaharris · 10th April 2009, 11:13 PM

Peter...

Just found this site a few days ago.... The mother load!

I started the Pavel today... Transformers arrive Mon.

Are there any of the F4 boards available? F5? PS?

What, in your openion, are the sonic differences?

MDH

Peter Daniel · 11th April 2009, 12:52 AM

Yes, both F5 and F4 boards are available. No PS pcbs though, but it's so simple that p2p or veroboard method could be actually better than universal board.

As to comparison, I never built F4, so can't comment; regarding other amps, I expressed my views here: http://www.diyaudio.com/forums/showt...t=#post1741265

9th April 2009, 07:38 PM	#43
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	There are 2 gnd pads: one for RCA input, the other to connect with main filter caps. The output gnd is not taken from amp board (as it wouldn't make much sense) but from a common point on main filter caps. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

10th April 2009, 08:19 PM	#48
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	This is not my design, so I'm not selling them from my website, you can get the boards only through this Forum. The instructions to purchase were explained in a first post of this thread: http://www.diyaudio.com/forums/showt...89#post1771389 __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

10th April 2009, 11:13 PM	#49
markdonnaharris diyAudio Member Join Date: Apr 2009	F4 & F5 Board Availability Peter... Just found this site a few days ago.... The mother load! I started the Pavel today... Transformers arrive Mon. Are there any of the F4 boards available? F5? PS? What, in your openion, are the sonic differences? MDH

11th April 2009, 12:52 AM	#50
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Yes, both F5 and F4 boards are available. No PS pcbs though, but it's so simple that p2p or veroboard method could be actually better than universal board. As to comparison, I never built F4, so can't comment; regarding other amps, I expressed my views here: http://www.diyaudio.com/forums/showt...t=#post1741265 __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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8th April 2009, 10:13 PM	#41
gil-garcia diyAudio Member Join Date: Oct 2006	Thanks korben, As j do not kwow what is dead or not, j have ordered new pcb and will change all componants. Now j check the bom. It was the first time j did not sucess

9th April 2009, 05:47 PM	#42
samoloko diyAudio Member Join Date: Jun 2006	Peter on your F5 pcbs there is 2 holes for the gnd which can be used for say In and out gnd but where to connect gnd from rails

10th April 2009, 05:48 AM	#44
samoloko diyAudio Member Join Date: Jun 2006	thx when you do Initial set up - Is It Important to short Input to gnd are you happy with sound of your F5 what bias you set 1.3 or high

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