lm3886 grounding made easy(?)

[pacoblackxx]

Ok...i am a newby and i am building my first dual channel lm3886 amplifier.

On each pcb i have the signal in ground(sgn-in-gnd),the speaker out ground(spk-out-gnd) and the power ground(pwr-gnd).

other grounds that also exist(not on the pcb!) are the main power ground(main-gnd) and the pot ground(pot-gnd).

1)I connect (main-gnd) on the chassis
2) points (sgn-in-gnd) and (pot-gnd) into a single point,lets say point1
3)point (pwr-gnd) goes on another point,lets say point2.

Then i connect point1 with point2.
Is that correct?

Where should i connect th spk-out-gnd?point1 or point2?

Please answer with the names used above cause im really confused..

Thnks!

[abraxalito]

Originally Posted by pacoblackxx

Ok...i am a newby and i am building my first dual channel lm3886 amplifier.

On each pcb i have the signal in ground(sgn-in-gnd),the speaker out ground(spk-out-gnd) and the power ground(pwr-gnd).

Are the above three grounds already connected to each other on the PCB?

other grounds that also exist(not on the pcb!) are the main power ground(main-gnd) and the pot ground(pot-gnd).

1)I connect (main-gnd) on the chassis

Definitely yes. Some would say this to be connected via a resistor and inverse parallel diodes but a direct connection is good to begin with.

2) points (sgn-in-gnd) and (pot-gnd) into a single point,lets say point1

Assuming the pot comes directly after the input then yes.

3)point (pwr-gnd) goes on another point,lets say point2.

Then i connect point1 with point2.
Is that correct?

Maybe, maybe not, depending on your answer to my first question.

[Cal Weldon]

Duplicate thread. See here:

Lm3886 grounding made easy(?)