White Noise, Protruding woofer

Code · 14th January 2008, 11:08 PM

Charlize (TA2020)

After removing both input caps and redirecting source ground to the biascap, I am now getting white noise and a protruding woofer from the left channel.

Any advice would be appreciated.

Edit: Just noticed a barely audible hissing from the right tweeter

G4ME · 15th January 2008, 08:22 PM

the protruding woofer, would be a DC offset on the output, not sure what would be causing that, are you using a full bridge or half bridge design?

Puffin · 16th January 2008, 07:31 AM

Why have you removed the input caps ? Do you have any pics ?

Lostcause · 16th January 2008, 11:10 AM

Are your power supplies isolated from each other?
You need to have either source or amp on battery only when in use. No ground continuity.
Also, does your source have any DC on it's output? The caps block DC in as well as DC out so anything coming in will mess up the bias.
I've managed to get a Charlize (with PSU) running from an Ipod (on battery) without any issues using the same method.

Code · 16th January 2008, 04:38 PM

Ahh, works fine with my mp3 player!

Quite strange as the amp PSU wasnt connected to ground anyway, not to worry, Ill cancel the replacement Charlize and buy a quality battery setup

Cheers fellas

Lostcause · 16th January 2008, 05:26 PM

Quote:

Originally posted by Code
Ahh, works fine with my mp3 player!

Quite strange as the amp PSU wasnt connected to ground anyway, not to worry, Ill cancel the replacement Charlize and buy a quality battery setup

Cheers fellas

Good to hear it's sorted code

Just to clarify my point a little.... The two units cannot share the same power source; as in the ring main of the house. If so there is continuity of the blue return ground through the plugs. Not the safety earth

Code · 16th January 2008, 06:02 PM

ahhh

thankyou

14th January 2008, 11:08 PM	#1
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	White Noise, Protruding woofer Charlize (TA2020) After removing both input caps and redirecting source ground to the biascap, I am now getting white noise and a protruding woofer from the left channel. Any advice would be appreciated. Edit: Just noticed a barely audible hissing from the right tweeter

15th January 2008, 08:22 PM	#2
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	the protruding woofer, would be a DC offset on the output, not sure what would be causing that, are you using a full bridge or half bridge design? __________________ Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.

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16th January 2008, 07:31 AM	#3
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	Why have you removed the input caps ? Do you have any pics ?

16th January 2008, 11:10 AM	#4
Lostcause diyAudio Member Join Date: Aug 2005 Location: NW UK	Are your power supplies isolated from each other? You need to have either source or amp on battery only when in use. No ground continuity. Also, does your source have any DC on it's output? The caps block DC in as well as DC out so anything coming in will mess up the bias. I've managed to get a Charlize (with PSU) running from an Ipod (on battery) without any issues using the same method.

16th January 2008, 04:38 PM	#5
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	Ahh, works fine with my mp3 player! Quite strange as the amp PSU wasnt connected to ground anyway, not to worry, Ill cancel the replacement Charlize and buy a quality battery setup Cheers fellas

16th January 2008, 06:02 PM	#7
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	ahhh thankyou

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