Soundigital 16kd

[megael9]

This unit had 4 bad audio output MOSFET,
They were all replaced together with the IR2113 driver IC,
But know the amp have a noise like if it was missing a ground,
There is audio, but it sound like when an amp have the ground
Shield connector broken.

 

[ultra]

Please, post some pics of the amp

 

[megael9]

here are some pictures

 

[ultra]

Do you have +/- 15V on pins 4 and 11 of TL074 ?

 

[megael9]

There is +/- 12 volts at pins

 

[ultra]

Looking at your other post, regarding noise, are you sure your signal source is grounded along with your power supply ?

 

[megael9]

I traced the RCA ground connector and it does not connected straight to the power supply ground, it goes to a couple of resistor and then goes to one of the two tl074 ICs.

 

[ultra]

what if you connect a cable between the RCA shields of the amp and the ground of your power supply?

Does the noise go away?

 

[megael9]

Can that cause damage to the amp?
If not I can try it.

 

[ultra]

No, it will not.
If an amplifier is installed in a car, the RCAs ground is the chassis, so is the power ground of the amp.

How do you feed signal to the amp in your bench?

 

[megael9]

Yes

 

[ultra]

Yes

What do you mean by "yes" ????

 

[megael9]

Works fine when the RCA ground is connected to power ground,
Can it stay the way?

 

[ultra]

Great !

Yes, that is how it is connected in a car installation.

 

[megael9]

Thank you very much.

 

[ultra]

You are welcomed !

 

[megael9]

I install the amp in the vehicle, but now
when the windows is put up or down
There's a poping noise at the speaker.
Any suggestio? It does the same in two
different cars.