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Old 24th April 2009, 12:32 PM   #81
mstr is offline mstr  Austria
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Default 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
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Old 24th April 2009, 03:05 PM   #82
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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.
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Old 27th April 2009, 01:12 AM   #83
1MOR is offline 1MOR  United States
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Peter, the boards arrived. Thank you!
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Old 28th April 2009, 03:28 PM   #84
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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?
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Old 28th April 2009, 05:32 PM   #85
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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
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Old 28th April 2009, 05:52 PM   #86
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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.
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Old 28th April 2009, 06:57 PM   #87
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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
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Old 28th April 2009, 07:18 PM   #88
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Hoe is it when you put it into stop?
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Old 28th April 2009, 07:47 PM   #89
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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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Old 28th April 2009, 08:02 PM   #90
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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.
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