F5 pcb group buy... - Page 9

mstr · 24th April 2009, 11:32 AM

Hello Peter,

time for another buy! Are you still on stock with the F5 boards?

Please send me 3x F5 boards (6 channels).

I've just made the PayPal transfer for the boards, if there are any problems, please let me know.

Thanks for your effort,

Michael

Peter Daniel · 24th April 2009, 02:05 PM

Thanks for the order, it will ship today.

At the moment, I have approx 15 stereo sets left; when they gone, it may be a while before I reorder.

1MOR · 27th April 2009, 12:12 AM

Peter, the boards arrived. Thank you!

Peter Daniel · 28th April 2009, 02:28 PM

Quote:

Originally posted by samoloko
at first I had connected both yellow wires to the gnd of last filter cap
http://www.diyaudio.com/forums/showt...10#post1807410
but after Andrew T recommendation - one post ubove I did extension with gray wire
one last thing - I don't have safety network - I only experiment at that point

That grey wire extention is not a good idea. Both ground wires should be connected directly to the caps.

Are you using a single supply to power both amp channels?

samoloko · 28th April 2009, 04:32 PM

Hi Peter

at the moment I am trying to find the reason why I get buzz so I use only one F5 amp pcb which Is connected like on the picture
0V from the PSU filter caps - gnd of F5 amp pcb - yellow wire
0V from the PSU filter caps - speaker return - yellow wire
the Input of F5 amp Is open circuit

Peter Daniel · 28th April 2009, 04:52 PM

The input shouldn't be left open if you are checking for buzz.; you shoulkd have a properly operating source connected.

There is not much that can go wrong here, I've built many amps wired this way and all worked fine.

See pics of my latest one: http://www.diyaudio.com/forums/showt...24#post1740824

Just make sure that both ground wires are connected DIRECTLY to the commonn point on caps, without the extender. Ground from RCA connect directly to SG point on amp board and nowhere else. RCA should be isolated form a chassis.

samoloko · 28th April 2009, 05:57 PM

thx Peter

I connected to cd player
yes there were no ground loop buzz what I got when open loop, but instead of I got too much hiss when pause

Peter Daniel · 28th April 2009, 06:18 PM

Hoe is it when you put it into stop?

samoloko · 28th April 2009, 06:47 PM

no difference
but I have connected directly to dvd output without pot (not cd as I post) with 5 m long cable
I don't understand why I got buzz when Input Is not connected
sure my commercial amp don't do that

Peter Daniel · 28th April 2009, 07:02 PM

How is it when you switch the power off from the DVD?

All your wires are pretty long and not arranged optimally, that might be a reason for a buzz.

24th April 2009, 11:32 AM	#81
mstr diyAudio Member Join Date: Feb 2007 Location: Austria, Villach	F5 boards Hello Peter, time for another buy! Are you still on stock with the F5 boards? Please send me 3x F5 boards (6 channels). I've just made the PayPal transfer for the boards, if there are any problems, please let me know. Thanks for your effort, Michael

24th April 2009, 02:05 PM	#82
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Thanks for the order, it will ship today. At the moment, I have approx 15 stereo sets left; when they gone, it may be a while before I reorder. __________________ 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

28th April 2009, 04:52 PM	#86
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	The input shouldn't be left open if you are checking for buzz.; you shoulkd have a properly operating source connected. There is not much that can go wrong here, I've built many amps wired this way and all worked fine. See pics of my latest one: http://www.diyaudio.com/forums/showt...24#post1740824 Just make sure that both ground wires are connected DIRECTLY to the commonn point on caps, without the extender. Ground from RCA connect directly to SG point on amp board and nowhere else. RCA should be isolated form a chassis. __________________ 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

28th April 2009, 06:18 PM	#88
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Hoe is it when you put it into stop? __________________ 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

28th April 2009, 07:02 PM	#90
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	How is it when you switch the power off from the DVD? All your wires are pretty long and not arranged optimally, that might be a reason for a buzz. __________________ 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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27th April 2009, 12:12 AM	#83
1MOR diyAudio Member Join Date: Jul 2008	Peter, the boards arrived. Thank you!

28th April 2009, 04:32 PM	#85
samoloko diyAudio Member Join Date: Jun 2006	Hi Peter at the moment I am trying to find the reason why I get buzz so I use only one F5 amp pcb which Is connected like on the picture 0V from the PSU filter caps - gnd of F5 amp pcb - yellow wire 0V from the PSU filter caps - speaker return - yellow wire the Input of F5 amp Is open circuit

28th April 2009, 05:57 PM	#87
samoloko diyAudio Member Join Date: Jun 2006	thx Peter I connected to cd player yes there were no ground loop buzz what I got when open loop, but instead of I got too much hiss when pause

28th April 2009, 06:47 PM	#89
samoloko diyAudio Member Join Date: Jun 2006	no difference but I have connected directly to dvd output without pot (not cd as I post) with 5 m long cable I don't understand why I got buzz when Input Is not connected sure my commercial amp don't do that

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