How does my board look?

punchpeanut · 11th June 2004, 05:52 PM

Please take into account this is my first real stab at a board. I made it with expresspcb, but all traces will be on the bottom, I put them on the top here for easier viewing. If it looks good, I will try to make my some by myself.

The 2 will be seperated and mounted individually.

Devil_H@ck · 11th June 2004, 06:06 PM

The out+ trace looks a bit small, maybe you could try to make it thicker?
The rest looks ok, as far as I can see. Nice job.

carlosfm · 11th June 2004, 07:09 PM

I would put the PSU caps joined toguether at the middle of the PCB, and the input on one side, output on the other side.

Peter Daniel · 11th June 2004, 08:07 PM

I'm not that familiar with pin out on OPA541, but it seems like feedback loop path is unneccessarily long.

trigon · 11th June 2004, 08:44 PM

Quote:

Originally posted by Peter Daniel
I'm not that familiar with pin out on OPA541, but it seems like feedback loop path is unneccessarily long.

I've noticed that too.

Trigon.

soundNERD · 12th June 2004, 02:36 AM

Would you mind uploading the B&W copper pattern without text? I would really like to play around with the 541, but haven't got around to designing PCBs.

thanks.

punchpeanut · 12th June 2004, 05:47 AM

OK, over the next few days I will implement some of your suggestions. I'll post it when I get it done.

Thanks.

mAJORD · 12th June 2004, 01:08 PM

looks great for a first board, congrats for making the effort.
so yea if u can just fix up that overlly long feedback , which i assume is going from the bottom of the 22k round the back to the output then to 2nd pn from left?? , then it should be closer to the mark, unfortunatly thats one of the very crucial factors of a good gainclone.

would u consider P2Ping the feedback resistor.. like in my mock up here.

(the 1 running horizontal along the top)

i know its not as neat as a pcb but its the shortest path possible isnt it

carlmart · 12th June 2004, 02:01 PM

Quote:

Originally posted by mAJORD
i know its not as neat as a pcb but its the shortest path possible isnt it

Beware of those naked wires!!!

Use some teflon spaguetti to protect from shortcircuits and oxidation.

The former is quite likely to happen in the assembly, and Murphy's law is dominant in p2p.

Carlos

zagisrule! · 12th June 2004, 02:34 PM

FYI: When you print Express PCB stuff, it leaves a dark board area to make it very difficult to create home-brew PCB's. They want you to order them...

Here is the solution: before you print your final artwork, double click all the board corners and put in the coordinates "0,0" for all spots. The board outline will disappear and you will be able to print the layout and do any sort of transfer to PCB. It does still leave a .1" grid, but the dark fill color of the normal style printing disappears.

-Matt

11th June 2004, 06:06 PM	#2
Devil_H@ck diyAudio Member Join Date: Dec 2003 Location: Belgium	The out+ trace looks a bit small, maybe you could try to make it thicker? The rest looks ok, as far as I can see. Nice job. __________________ Website: http://members.lycos.nl/anthonyvh

11th June 2004, 08:07 PM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I'm not that familiar with pin out on OPA541, but it seems like feedback loop path is unneccessarily long. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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11th June 2004, 07:09 PM	#3
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	I would put the PSU caps joined toguether at the middle of the PCB, and the input on one side, output on the other side.

12th June 2004, 02:36 AM	#6
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	Would you mind uploading the B&W copper pattern without text? I would really like to play around with the 541, but haven't got around to designing PCBs. thanks.

12th June 2004, 05:47 AM	#7
punchpeanut diyAudio Member Join Date: Jul 2003 Location: twin cities	OK, over the next few days I will implement some of your suggestions. I'll post it when I get it done. Thanks.

12th June 2004, 01:08 PM	#8
mAJORD diyAudio Member Join Date: Apr 2004 Location: Brisbane Australia	looks great for a first board, congrats for making the effort. so yea if u can just fix up that overlly long feedback , which i assume is going from the bottom of the 22k round the back to the output then to 2nd pn from left?? , then it should be closer to the mark, unfortunatly thats one of the very crucial factors of a good gainclone. would u consider P2Ping the feedback resistor.. like in my mock up here. (the 1 running horizontal along the top) i know its not as neat as a pcb but its the shortest path possible isnt it

12th June 2004, 02:34 PM	#10
zagisrule! diyAudio Member Join Date: Apr 2004 Location: Edgewood, NM	FYI: When you print Express PCB stuff, it leaves a dark board area to make it very difficult to create home-brew PCB's. They want you to order them... Here is the solution: before you print your final artwork, double click all the board corners and put in the coordinates "0,0" for all spots. The board outline will disappear and you will be able to print the layout and do any sort of transfer to PCB. It does still leave a .1" grid, but the dark fill color of the normal style printing disappears. -Matt

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