Volume control acting Up... PLS Help

Wynand · 10th January 2006, 10:46 AM

I've been having a problem.

I built a mono amplifier using the LM3876 chip, just to check the sound quality.

When I play it from my CD-roms headphone out or DVD's headphone out its fine.

When I use a pot at full volume its fine but as soon as I bring the volume down it starts
acting up.

Is this a common problem?
Does anybody have any ideas for me.

Do I need to use a buffer with the input? If so where can I get an approved schematic for it.

P.s. I've used the pot circuit with TDA2050 amps.. no problem

Any help is appreciated

janneman · 10th January 2006, 10:58 AM

Quote:

Originally posted by Wynand
[snip]it starts acting up.[snip]

Could you maybe be a little bit more clear???

Jan Didden

Wynand · 10th January 2006, 11:16 AM

It sounds like it starts to buzz/hum.

I don't keep it on for long in case something blows.

janneman · 10th January 2006, 11:50 AM

Quote:

Originally posted by Wynand
It sounds like it starts to buzz/hum.

I don't keep it on for long in case something blows.

If you turn it down, does the sound go down as well in addition to the start of the hum, or does the sound level stay (almost) the same?

Jan Didden

Wynand · 10th January 2006, 11:58 AM

I'll have to listen 2night at home. I'm @ work @ the moment.

janneman · 10th January 2006, 12:02 PM

Quote:

Originally posted by Wynand
I'll have to listen 2night at home. I'm @ work @ the moment.

Me too...

Jan Didden

Nordic · 10th January 2006, 12:04 PM

Wynand, inverted amp or not?

Wynand · 10th January 2006, 12:18 PM

I'm using the datasheet schematic.

Whats the recomended volume pot value and whats the pros and cons of using higher value pots?

10th January 2006, 10:46 AM	#1
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Volume control acting Up... PLS Help I've been having a problem. I built a mono amplifier using the LM3876 chip, just to check the sound quality. When I play it from my CD-roms headphone out or DVD's headphone out its fine. When I use a pot at full volume its fine but as soon as I bring the volume down it starts acting up. Is this a common problem? Does anybody have any ideas for me. Do I need to use a buffer with the input? If so where can I get an approved schematic for it. P.s. I've used the pot circuit with TDA2050 amps.. no problem Any help is appreciated

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10th January 2006, 11:16 AM	#3
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	It sounds like it starts to buzz/hum. I don't keep it on for long in case something blows.

10th January 2006, 11:58 AM	#5
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	I'll have to listen 2night at home. I'm @ work @ the moment.

10th January 2006, 12:04 PM	#7
Nordic diyAudio Member Join Date: Sep 2005	Wynand, inverted amp or not?

10th January 2006, 12:18 PM	#8
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	I'm using the datasheet schematic. Whats the recomended volume pot value and whats the pros and cons of using higher value pots?

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