reduce noisy of amp

[lcd950]

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?

 

[Enzo]

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?

 

[lcd950]

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

 

[turk 182]

a schematic and a picture of your project might help

 

[lcd950]

Here is both schematic amp and preamp

 

[Speedskater]

The schematic's didn't load.

For a test try a different music source (maybe a battery powered one).

 

[KatieandDad]

Can you disconnect pre from power amp ?

 

[lcd950]

Here is both schematic amp and preamp

 

[stratus46]

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.

G²

 

[lcd950]

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.

G²

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.

 

[stratus46]

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.

The range of the volume control isn't the value of the pot 47K or 100K. My suggestion is to reduce the gain of the power amps by 12 dB. If the gain of the power amp is too low you'll have to turn up the volume control higher which might be a problem. Reducing the power amp gain will reduce its' noise independent of the preamp.

G²

 

[turk 182]

i could be wrong but it sounds like the original poster is trying to reduce the residual background noise that every amplifier makes this could a difficult chore as the source of noise could be the stk itself.

 

[stratus46]

i could be wrong but it sounds like the original poster is trying to reduce the residual background noise that every amplifier makes this could a difficult chore as the source of noise could be the stk itself.

Dropping the power amp gain from 101 to 26 may quiet it enough to take it from annoying to OK.

G²

 

[lcd950]

here is one image of my amp

 

[turk 182]

well a picture is worth a thousand words.worrying about noise when your circuit has no shielding. and your heatsink is that grounded?
it also appears that there's no shielding on the input wiring?

 

[lcd950]

MY NEW AMPLIIER

 

[lcd950]