Pls Check PCB for OPA541...

[JojoD818]

Hi everyone,

I made a non-inverting setup of the OPA541 with a 0.1R/5W Rcl for sensing current. Could you please comment if I have made any mistake or if you have any suggestions please do so.

Thanks in advance!
JojoD

 

[svokke]

I've got two remarks:
- Shouldn't there be a resistor of 47K/100K from pin 1 to ground to set the input impedance?
-Is the current sense resistor attached to the trace above 'out'? I think it is and that's ok, I just wasn't shure
The rest looks really nice, what program did you use to draw it?

 

[JojoD818]

Hi,

I think you're right about the input impedance resistor, I did not include that. About the current sense, it is connected above the "out".

I only used CorelDraw in drawing the PCB.

JojoD

 

[Raka]

I'm not an expert, but maybe you should think about joining both gnd pins of the big caps before they hit the star ground.

 

[Mad_K]

Looks OK, but you need a 22K to gnd from pin 1

 

[JojoD818]

Hi everyone,

Just made the pcbs using pentel pen . I hope it works. 22K to ground from pin 1 will be soldered at the foilside of the pcb. The ground of the supply caps have been joined together before going to the star ground. Thanks.

I'll start soldering as soon as I finish drilling, I hope the pcb works!

JojoD

 

[Raka]

Besides, I would take the output gnd closer to the GND input, that is, not after the power GND

 

[JojoD818]

Hi guys!

The pcb works! The 22k was connected at the bottom of the pcb and the grounding was changed to your suggestions.

The 2 amps are powering a 12 inch Targa sub with dual 4 ohms coils (one for each amp) in a vented box. Things around the room are shaking/falling, my wife complains saying the bass is too loud and the windows are rattling .

The sound is very good but if you have other suggestions, please do so.

Thanks,
JojoD

 

[Raka]

Congrats!
Don't forget that you HAVE to show here some pics!

 

[JojoD818]

Raka,

Thanks, I will post some pics as soon as I can so that you and the guys can have a look.

BTW, the amps are still playing


JojoD