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Old 7th October 2010, 09:36 AM   #551
AndrewT is offline AndrewT  Scotland
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Hi,
when do you hear this low level Hum?

Only when no source is connected, or only when the input is shorted, or only when the input is open circuit, or a combination of these?
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Old 7th October 2010, 01:41 PM   #552
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Andrew, I understood from him that shorting input to ground ceases the noise.

Try to hook up your source and then measure, maybe having the inputs without a ground reference (nothing hooked up, free-air) brings out noise.

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Regi
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Old 7th October 2010, 07:31 PM   #553
shmulik is offline shmulik  Israel
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Default Hum

the hum occurs when the input is in free air. still there is a pull down resistor just for that. I'll try hooking a source (output of opamp) and see what comes.
any ideas regarding the second strange thing - the unequal heating of the bridges?
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Old 8th October 2010, 09:00 AM   #554
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by shmulik View Post
the hum occurs when the input is in free air.
that is a perfect way to reproduce music!
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Old 8th October 2010, 06:41 PM   #555
shmulik is offline shmulik  Israel
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Default catching air

Quote:
Originally Posted by AndrewT View Post
that is a perfect way to reproduce music!
some reviewers use the tarm "air between instruments" when refering to sonic qualities. isn't the best way to catch that air is with no instruments to begin with? the rest follows.
seriously speaking, this hum haunts me. several of my DIY attempts ended humming. I even had a GainClone the was perfectly mute, and after returning from a friend cought up humming I failed to remove. I must be doing something profoundly wrong, but I can not spot it.
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Old 8th October 2010, 06:45 PM   #556
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by shmulik View Post
........seriously speaking, this hum haunts me. several of my DIY attempts ended humming. I even had a GainClone the was perfectly mute, and after returning from a friend cought up humming I failed to remove. I must be doing something profoundly wrong, but I can not spot it.
if you leave the input open circuit you have effectively added a high impedance aerial to the amplifier.
This is never the way you connect an amplifier to reproduce audio.
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Old 12th October 2010, 02:13 PM   #557
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Hi,
is it possible to have one stereo pair pcb?
Or they're finished?

Regards
Matteo
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Old 6th November 2010, 02:16 PM   #558
jwor is offline jwor  United States
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I would like to buy a pair of F5 boards if there are any for sale.
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Old 9th November 2010, 12:56 PM   #559
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Me too, what's the difference with the boards in diyaudio store ?

D.
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Old 10th November 2010, 12:09 AM   #560
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Quote:
Originally Posted by Nikon1975 View Post
Me too, what's the difference with the boards in diyaudio store ?

D.
They are both F-5, just two different board layouts form two different sources.
The Daniels boards are more compact, the Cviller boards are a little larger.
There were originally some boards that later became available from Cviller as well, that had sufficient room for 4 out puts per channel, see his blog, and the group buy threads on both the Daniels and the Cviller boards for pics and building dicussion. They are both shorter than the gigantic F-5 thread, but it is certainly worth working through, take notes along the way.

Russellc
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