For those who have hum with theyr gainclone (loud or not)

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Bricolo

Bricolo

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Joined 2002
#1
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 2000µF 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
 
#3
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 😉
 
#5
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
 
#6
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
 
#7
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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