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Old 6th November 2013, 07:33 AM   #1
lcd950 is offline lcd950  Sri Lanka
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Default reduce noisy of amp

I have made a STK4192II audio amp and a LM1036N preamp.

So when I connect this with my speakers it get little bit of noisy, When I reduce volume from preamp that noise also get reduce, but when I listen to the music that noise also comes.

So what kind of thing should I do for remove this noise. for make sound clear?
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Old 6th November 2013, 08:15 AM   #2
Enzo is offline Enzo  United States
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Sounds like your preamp is noisy then. Noise takes many forms, and it comnes from many sources. You need to know what kind oif noise you have begore we know what to do about it. Is it hiss or hum or crackling or just what?
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Old 6th November 2013, 08:25 AM   #3
lcd950 is offline lcd950  Sri Lanka
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Quote:
Originally Posted by Enzo View Post
Sounds like your preamp is noisy then. Noise takes many forms, and it comnes from many sources. You need to know what kind oif noise you have begore we know what to do about it. Is it hiss or hum or crackling or just what?
It is a hiss noise
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Old 7th November 2013, 11:48 AM   #4
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a schematic and a picture of your project might help
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Old 7th November 2013, 01:29 PM   #5
lcd950 is offline lcd950  Sri Lanka
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Here is both schematic amp and preamp
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Old 7th November 2013, 03:47 PM   #6
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The schematic's didn't load.

For a test try a different music source (maybe a battery powered one).
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Old 7th November 2013, 04:02 PM   #7
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Can you disconnect pre from power amp ?
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Old 8th November 2013, 05:44 AM   #8
lcd950 is offline lcd950  Sri Lanka
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Quote:
Originally Posted by lcd950 View Post
Here is both schematic amp and preamp
Attached Images
File Type: jpg STK4192II.jpg (242.0 KB, 125 views)
File Type: jpg LM1036N.jpg (171.9 KB, 122 views)
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Old 8th November 2013, 10:35 AM   #9
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Quote:
Originally Posted by lcd950 View Post
It is a hiss noise
The data sheet for the 1036 claims 80dB sn relative to 0.3 Volt which to me is a bit noisy but livable. However, your power amp gain is 101 which seems WAY too high which would aggravate your problem. You might try reducing the 56K resistors in the power amp feedback down to 15k which will push the gain and noise floor down about 12dB. If you have sufficient volume control range you can leave it there.

G
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Old 8th November 2013, 01:12 PM   #10
lcd950 is offline lcd950  Sri Lanka
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Quote:
Originally Posted by stratus46 View Post
The data sheet for the 1036 claims 80dB sn relative to 0.3 Volt which to me is a bit noisy but livable. However, your power amp gain is 101 which seems WAY too high which would aggravate your problem. You might try reducing the 56K resistors in the power amp feedback down to 15k which will push the gain and noise floor down about 12dB. If you have sufficient volume control range you can leave it there.

G
For LM1036N preamp I've used 100k volume controls.

I checked disconnecting preamp but noise still same.

But I didn't check with battery powered one, I'll check it.

Also I will post my project photos later, certainly.
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