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Old 10th January 2006, 10:46 AM   #1
Wynand is offline Wynand  South Africa
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Default 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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Old 10th January 2006, 10:58 AM   #2
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Default Re: Volume control acting Up... PLS Help

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

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

Jan Didden
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Old 10th January 2006, 11:16 AM   #3
Wynand is offline Wynand  South Africa
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It sounds like it starts to buzz/hum.

I don't keep it on for long in case something blows.
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Old 10th January 2006, 11:50 AM   #4
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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
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Old 10th January 2006, 11:58 AM   #5
Wynand is offline Wynand  South Africa
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I'll have to listen 2night at home. I'm @ work @ the moment.
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Old 10th January 2006, 12:02 PM   #6
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Quote:
Originally posted by Wynand
I'll have to listen 2night at home. I'm @ work @ the moment.

Me too...

Jan Didden
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Old 10th January 2006, 12:04 PM   #7
Nordic is offline Nordic  South Africa
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Wynand, inverted amp or not?
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Old 10th January 2006, 12:18 PM   #8
Wynand is offline Wynand  South Africa
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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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