Noise when signal is turned off

mholst · 7th February 2012, 10:55 AM

Hi all

First of all, I am quite new to diy builds, so I started with a diy kit from chipamp.com.
2 x Dual mono (LM3886) for driving my System Audio Ranger Master speakers in bi-amp.
The amps sound great, and I am very pleased with the result.

My problem is, that I hear a small scratch whenever i skip or pause a track. I have tried with several sources, and the noise occurres whenever the signal is cut.

Do you have any suggestions?

I have tried to search the forum, and haven't been able to find a thread solving my problem. Please direct me to a thread if you have better search words than me.

Best regards
Morten Attermann Holst

AndrewT · 7th February 2012, 12:28 PM

The Source is probably sending a pulse when the Play and Mute conditions are swapped.

mholst · 7th February 2012, 12:32 PM

Thanks for the reply.

I have had a Rotel amplifier connected previously, and that did not make the noise. So I don't think the source is at fault.

/Morten

pinkmouse · 7th February 2012, 01:34 PM

I don't think the chipamp pcb has DC blocking on the input, your old Rotel will have.

lanchile · 8th February 2012, 03:41 PM

Add a NP capacitor in the RCA inputs like 3.9uf or 4.7uf and listen if the noise goes away.

7th February 2012, 10:55 AM	#1
mholst diyAudio Member Join Date: Sep 2011	Noise when signal is turned off Hi all First of all, I am quite new to diy builds, so I started with a diy kit from chipamp.com. 2 x Dual mono (LM3886) for driving my System Audio Ranger Master speakers in bi-amp. The amps sound great, and I am very pleased with the result. My problem is, that I hear a small scratch whenever i skip or pause a track. I have tried with several sources, and the noise occurres whenever the signal is cut. Do you have any suggestions? I have tried to search the forum, and haven't been able to find a thread solving my problem. Please direct me to a thread if you have better search words than me. Best regards Morten Attermann Holst

7th February 2012, 12:28 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	The Source is probably sending a pulse when the Play and Mute conditions are swapped. __________________ regards Andrew T.

7th February 2012, 01:34 PM	#4
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I don't think the chipamp pcb has DC blocking on the input, your old Rotel will have. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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7th February 2012, 12:32 PM	#3
mholst diyAudio Member Join Date: Sep 2011	Thanks for the reply. I have had a Rotel amplifier connected previously, and that did not make the noise. So I don't think the source is at fault. /Morten

8th February 2012, 03:41 PM	#5
lanchile diyAudio Member Join Date: Sep 2008	Add a NP capacitor in the RCA inputs like 3.9uf or 4.7uf and listen if the noise goes away.

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