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Old 26th August 2004, 03:08 PM   #1
f4bok is offline f4bok  France
diyAudio Member
Join Date: Aug 2004
Location: lyon
Default It Should Not Work !

Hi everybody
I'm french, i'm sorry for my bad english but i hope you'll understand.

I modified my pwrsupply of my amplifier because i had some Bzzzz when i put my hear close to the médium driver. It was not "sinewave" 100Hz (france is 50Hz mains) but
peakwave sound so i thought it came from the peak crt when feeding the rail capacitors.

I separated my rail capacitors in two parts (see schematic) and introduced between ONLY ONE inductor (10mH/15A) in the ground wire because i have only one inductor.
Now i have perfect silence.

IT SHOULD NOT WORK, because there is (normaly) no crt crossing the inductor when feeding the caps, but it does !!??
Any idea ??
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Old 1st September 2004, 10:54 PM   #2
diyAudio Member
Join Date: Jun 2004
Location: Knoxville
What you have done is created a filter and your circuit is referenced to this filtered reference. Good simple way to eliminate noise. And BTW it should work, depending on the amp circuit.
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Old 6th September 2004, 02:31 PM   #3
f4bok is offline f4bok  France
diyAudio Member
Join Date: Aug 2004
Location: lyon
Hi Cunningham & tks for your reply
What i dont understand is that, the current shoud cross the second part of the caps, directly from the +rail to the -rail, (just as if there is only one cap made of 2 in serial) because there are no nomaly the same voltages at the midles of the 2 packs of caps.
Mayby the real values of the caps are different.......

Anyway, now i changed my mind and put 0.27R resistor in each rail and have the same result, it's realy smaler and not the same weight !!!
nb: the amplifier is a "the discret" from elektor first made in 1991 and modified now.
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Old 6th September 2004, 05:33 PM   #4
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Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Congratulations....good idea!

I think you idea is very good (Je pense,qui vous pense très bien!)


Full throotle amplifier manufacturing;, Sample Dx Classic
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