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Old 17th October 2003, 05:38 PM   #1
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Default Pls Check PCB for OPA541...

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
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File Type: jpg opa541 power amp pcb.jpg (27.9 KB, 428 views)
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Old 17th October 2003, 08:37 PM   #2
svokke is offline svokke  Belgium
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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?
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Old 18th October 2003, 02:35 AM   #3
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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
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Old 18th October 2003, 08:55 AM   #4
Raka is offline Raka  Europe
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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.
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Old 18th October 2003, 11:00 AM   #5
Mad_K is offline Mad_K  Norway
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Looks OK, but you need a 22K to gnd from pin 1
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Old 18th October 2003, 11:12 AM   #6
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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
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Old 18th October 2003, 12:53 PM   #7
Raka is offline Raka  Europe
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Besides, I would take the output gnd closer to the GND input, that is, not after the power GND
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Old 18th October 2003, 02:29 PM   #8
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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
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Old 18th October 2003, 04:29 PM   #9
Raka is offline Raka  Europe
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Congrats!
Don't forget that you HAVE to show here some pics!
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Old 18th October 2003, 07:29 PM   #10
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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


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