Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

noisy capacitor?

0 views
Skip to first unread message

Terry Ackland

unread,
May 13, 2002, 11:16:37 PM5/13/02
to
Hi,
before dumping my faithful workshop stereo reciever, I took the back
off to try to discover why one speaker was being bounced around with
loud cracking noises before the cut out kicks in and out.
Having no electronics knowledge or test equipment I just gave it a
look and a prod. I guessed it was a leaky cap. and when I turned the
volume right down I am sure I could hear a capacitor/s making a
noise similar to the amplified noise. I then stuck a piece of plastic
tube to my ear like a stethescope and the other on the noisy cap
Can bad capacitors make an audible noise or is it just my imagination?
Thanks, Terry

Jerry G.

unread,
May 14, 2002, 8:03:44 AM5/14/02
to
You must have heard some vibration from somewhere. If you like the set,
give it out to a service centre for an estimate. It may be a small
problem that can be fixed at a low cost.

Without the proper training and test equipment, it will be difficult or
impossible to fix yourself.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
==============================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
Instruments http://www.zoom-one.com/glgtech.htm
==============================================
"Terry Ackland" <hex...@odyssee.net> wrote in message
news:3ce07bea...@news.microtec.net...

fidik

unread,
May 14, 2002, 8:35:22 AM5/14/02
to
The first thing that comes in mind in situations like this is to do some
diagnostics using common sense, without expensive setups or procedures. So why
does not one swap the speakers and determine if the problem is in the speaker or
in the amplifier?

Pedro English

unread,
May 14, 2002, 7:39:38 PM5/14/02
to
If in doubt...replace it! No harm in trying.
I could understand a cap making a noise if loose inside, variation in
current causing magnetostriction creating audible effects.
Not what you'd expect of a "noisy" cap!
I have heard electros boiling...before they exploded!
....usually the giveaway is they're getting pretty hot...

--
Pedro English
*****************
pls delete "nospam " to reply

Terry Ackland <hex...@odyssee.net> wrote in message
news:3ce07bea...@news.microtec.net...

Heath Young

unread,
May 14, 2002, 10:01:11 PM5/14/02
to
Yes, capacitors can reproduce music - it means they are dead. Had this
happen to an amplifier I got in to fix - apparently, the owner had been
putting car speakers in parallel - he had quite a collection - 12 in all -
this caused the capacitors to fail, and they were oddly enough reproducing
the music... very weird, but not unheard of.

Cheers
Heath Young

George R. Gonzalez

unread,
May 15, 2002, 11:31:28 AM5/15/02
to

.net...
> > Hi,
> > before dumping my faithful workshop stereo reciever, I took the back
> > off to try to discover why one speaker was being bounced around with
> > loud cracking noises before the cut out kicks in and out.
> > Having no electronics knowledge or test equipment I just gave it a
> > look and a prod. I guessed it was a leaky cap. and when I turned the
> > volume right down I am sure I could hear a capacitor/s making a
> > noise similar to the amplified noise.


Ceramic capacitors can make noises if they're hit with a strong pulse.
This is "normal" although not good. I usually replace any buzzing caps
(usually the compact ceramic Z5U kind), with a less-compact but
quieter NPO kind or other.


0 new messages