GIGA AMP TDA2030 single(or)bridge with tone control & mic

[myanmar]

Hello Friends,

Now I am trying to test my new complete AMP.

But there are many problem.

Power AMP + Tone control + two mice pre amp.

Power AMP single(or)bridge.
Tone control Bass, Treble
Mice Pre amp low, high impedence.

I found very noisy when combine all together in high all volume.

Mice pre amp need output resister.
Some Ground resister must take out & connect direct.
If I do that noise level will decrease.
Why that happen ?
I will post my schematic later.


Here is my picture.

 

[myanmar]

Here are my schmetics.

Two Mice Pre AMP Low & high impedence.

1. Low Impedence Pre AMP
need to ground between MIC & R3.
Why ?
If not that pre amp very noisy.

2. Two Mice Pre AMP need output resister before to the other pre AMP.
If not appear little crack sound ( not clear ) when talk to MIC.

Pls, advice & Explain.

Sorry for my poor english.

 

[myanmar]

Low Impedence

 

[myanmar]

That is my tone control.

non- inverting need to direct ground ( delete 68 K ).
Why ?

If not sound is crack in all high volume.

Pls, Explain me.
Why they put 68k in that circuit ?

Sorry for my poor english.

 

[myanmar]

My tone control is very clear & good.

I compare with DVD output to direct input TDA2030.

I don't know why ?

With my tone control is more clear than DVD direct input.

Anybody can explain to me why that happen ?

I think that may be because of Impedence.
Is that true ?

My TDA2030 circuit is same which is in data sheet.

Pls, Explain to me.

 

[myanmar]

My finished AMP