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 ??
Rgds
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 ??
Rgds
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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. 😀
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.
rgds
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.
rgds
Congratulations....good idea!
I think you idea is very good (Je pense,qui vous pense très bien!)
regards,
Carlos
I think you idea is very good (Je pense,qui vous pense très bien!)
regards,
Carlos
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