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Old 27th February 2005, 09:30 PM   #1
D_GR8_1 is offline D_GR8_1  Australia
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Default Brian GT's LM4780 PCB layout

Ok, so here's the story:

over the weekend I spent many hours trying to implement Brian's schematic for the LM4780 onto a PCB.

It is a very tedious & frustrating process.

BrianGT, is it possible to make this PCB available in a pdf as you have done so many times in the past.

I know PD said that he had it somewhere in his files, and it wasn't in a pdf format, but I would really appreciate it if you guys could make this available.

Thanks!
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Old 28th February 2005, 05:00 AM   #2
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... you haven't thought of buying a pcb, then you will get a 100% correct pcb with plated through holes. Brian isn't charging particulary much for it.
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Old 1st March 2005, 02:25 AM   #3
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I spent a few hours myself converting the PDF version into an Eagle file, I'd share it but I really dont feel that would be ethical, or fair to Brian and the rest of the group responsible for it's design. As Peranders suggested, if you do them yourself you won't have plated through holes...unless your PCB making skills are better than mine, anyway that problem can be solved by placing a few vias next to a few pins, and soldering a pice of wire between them. I have also seen small gromets that are available to make plated vias, but have not tried them myself. I was also wondering if one could use a conductive pen to fill the through holes

Anyway if you search through the original thread you will find the PCB files in PDF format, as well as several good screenshots than can be used to make your own.

Good Luck!
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Old 1st March 2005, 03:27 AM   #4
D_GR8_1 is offline D_GR8_1  Australia
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Why would I need plated through holes?

If you solder the component from both sides of the board isn't it the same?

Also, Gcollier, I think you are referring to the schematic pdf which has the initial design without the MUTE & Zobel.

I already have that one.

I mean, no big deal, I just thought that since the design of the PCB was discussed and created in these forums, we would have at least have access to a pdf, i'm not asking for the gerbers now, am I?
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Old 1st March 2005, 05:18 AM   #5
BrianGT is offline BrianGT  United States
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Here is a pdf of the layout. Red = top layer

(had to split it up into a file for the top layer and a file for the bottom layer due to file size)

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File Type: pdf lm4780t.pdf (98.1 KB, 536 views)
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Old 1st March 2005, 05:19 AM   #6
BrianGT is offline BrianGT  United States
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Green = bottom layer

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File Type: pdf lm4780b.pdf (32.2 KB, 377 views)
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Old 1st March 2005, 06:42 AM   #7
D_GR8_1 is offline D_GR8_1  Australia
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Thanks Brian.

You're a LEGEND!
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Old 1st March 2005, 07:00 PM   #8
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Quote:
Originally posted by D_GR8_1
Why would I need plated through holes?

If you solder the component from both sides of the board isn't it the same?

Hmmm...have you looked at the pin spacing on the LM4780...how do you intend to solder the pins on the topside of the PCB that are below the chip (the back row). If you find a way let me know and I can do away with a few vias.


Good luck with the project!
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Old 3rd March 2005, 01:43 AM   #9
D_GR8_1 is offline D_GR8_1  Australia
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I'm a bit confused here.

Which side do I print as it is & which one do I flip horizontally?!?
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Old 3rd March 2005, 02:36 AM   #10
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You flip the second image
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