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Old 11th July 2003, 09:45 AM   #1
Bricolo is offline Bricolo  France
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Default For those who have hum with theyr gainclone (loud or not)

Hi all,

I noticed a strange thing with my gainclone.
Both channels have a slight hum, use the same PS (with a velleman 18V 225VA toriod, dual bridge, and 2000F per rail)

Whith no input, I can hear the hum.
The strange thing (tell me if you have noticed the same thing) is that when I manually move (push on) one channel's woofer, the other side's hum is "modulated" by the 1st channel's woofer motion.

Is this normal?


thanks
Alex
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Old 11th July 2003, 11:18 AM   #2
UrSv is offline UrSv  Sweden
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A GC should be dead quiet so no that is not normal.
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Old 11th July 2003, 11:37 AM   #3
Bricolo is offline Bricolo  France
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My gainclone has no case, so this can explain the hum (I'm working on the case since yesterday. I started assembling all the aluminium plates)

But I know I'm not the only one with hum, so my question was dedicated to the other people with hum
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Old 11th July 2003, 12:13 PM   #4
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floating ground..... check ground connections between supply area and chip.

Maybe wrong placed resistor on ground connection...
Check zobel

my 2 cents.
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Old 11th July 2003, 02:43 PM   #5
Bricolo is offline Bricolo  France
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I do'nt want to talk about my hum problem, it'll be certainly fixed when I'll put the amp in it's metal case


I wanted to know if the other people that have hum ( even if it's very low) have the same thing as I have, when they manually move a woofer
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Old 16th July 2003, 09:11 AM   #6
Paulr is offline Paulr  United Kingdom
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Default The joys of electromagnetics

Hi Bricolo,

By moving your woofer you are inadvertantly causing a voltage to flow backwards towards the amp/ground. A speaker is a magnet & a coil of wire, move the coil back & forth over the magnet & you cause electron flow just like in the science experiments in school.

This is where I come unstuck: does the backward voltage go via the earth & change the relative voltage on the (-) pole on the other speaker? or does it affect the chip itself to cause the modulation?

Heres hoping I've helped more than I've opened new lines of questions.

Cheers

Paul
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Old 16th July 2003, 07:57 PM   #7
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i tried pushing my woofers on one channel and the other channel isn't affected by it.

my hum/hiss actually become less as i turn up the volume

either way the hum/hiss can be heard only when you stick your ears right next to the cones. i can't hear a thing from my listening position.
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