Mesure DC in AC outlets Cant find what is making noise in my AC 30CCX Help!!! !!! - Page 2 - diyAudio
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Old 22nd November 2010, 10:19 PM   #11
godfrey is offline godfrey  South Africa
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Location: Cape Town
Is this a guitar amp?
With valves or transistors?
Does it only hum with a guitar plugged in, or even when it's not connected to anything else?
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Old 23rd November 2010, 01:05 AM   #12
Ulisez is offline Ulisez  Mexico
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Location: Right now, Mexico
Hi, Its a Valve amp AC30CC2X
It hums with and without the guitar connected.
http://rapidshare.com/files/432520919/Buzzsoundsamp.zip
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Old 23rd November 2010, 04:14 AM   #13
Ulisez is offline Ulisez  Mexico
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Location: Right now, Mexico
Quote:
Originally Posted by Ulisez View Post
I've isolated the fault, the sound is mostly produced in the speakers.
I connected the external speaker out to another speaker and found out that the noise went to the speaker that I connected.
However there is a little noise going inside the amp. I don't know if this is normal
so I have uploaded 3 files one is with the amp off, one is with the amp on in standby
and the other to listen the sound of the speakers.
note that the one in stand by counts like if the speakers were disconnected.
When I connected the amp to another speaker I got near to the amp to see if it sounded like when it was in stand by mode. This was the only way I could record the sound with out the hum of the speakers.

Here the link to download the audio

http://rapidshare.com/files/432520919/Buzzsoundsamp.zip

Thanks I still haven't been able to measure and current using a CRO.
So now whats next?

There is another file... forgot to tell from the sound of a voltage regulator a Pc 500 if you search in the internet youll find it
Again it only makes that nasty noise here in my house, Ive tried it where my mom works and it dosn't make that much noise.
I found out the hum or buzz sound is 60hz/120hz/240hz
on the amp, on the speakers and on the voltage regulator
can this help to find a solution?
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Old 23rd November 2010, 06:42 AM   #14
Ulisez is offline Ulisez  Mexico
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Join Date: Oct 2010
Location: Right now, Mexico
Quote:
Originally Posted by AndrewT View Post
.
Can you post a schematic and pic of the contraption you added that did not work?
CIAUDIO : XDC•2 - AC Enhancing Filter
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