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-   -   new LM4780 layout, any comments? (http://www.diyaudio.com/forums/chip-amps/137131-new-lm4780-layout-any-comments.html)

BrianGT 23rd January 2009 05:45 AM

new LM4780 layout, any comments?
 
2 Attachment(s)
I haven't built up a LM4780 amp for a while, so I decided to make a new layout.

Goals for layout:
- single LM4780 + PSU on a single board
- able to be used in stereo or parallel
- reasonably compact: 3" x 5.5"
- decently robust power supply
- attempt at decent separation of grounds, allowing for a star ground for the inputs, going back to the main ground, a separate ground return for the output zobel networks and also the output grounds tied back close to the main ground.

What do you guys think?

BrianGT 23rd January 2009 05:46 AM

2 Attachment(s)
schematic

BrianGT 23rd January 2009 05:53 AM

2 Attachment(s)
Here is the bottom layer shown on top of the top layer, with the bottom silk screen (OGND is shown in the wrong place currently)

Green = bottom layer
Red = top layer

ratza 23rd January 2009 05:20 PM

Excellent. I don't think you can shorten tracks more than they are.

BrianGT 23rd January 2009 09:24 PM

My only major concern is leaving enough clearance to attach the chip to the heatsink. I believe that with the large caps pushed back, an angled screwdriver should be able to screw the board into the heatsink.

--
Brian

toolsresearch 23rd January 2009 09:29 PM

Re: new LM4780 layout, any comments?
 
Quote:

Originally posted by BrianGT
attempt at decent separation of grounds


Great!

Any interest in going back and doing the same for other chips? 3886?

Also, why not make it so that the board could be cut if someone wished to do so?

BrianGT 23rd January 2009 10:51 PM

Re: Re: new LM4780 layout, any comments?
 
2 Attachment(s)
Quote:

Originally posted by toolsresearch



Great!

Any interest in going back and doing the same for other chips? 3886?

Also, why not make it so that the board could be cut if someone wished to do so?

Here is a similar layout that I made for the LM3886, which I haven't finished fully yet.

The idea here is to have a narrow board, so that you can easily pop 2 aside each other for a dual mono amp and avoid having to wire up the power supply board to the amp board. (or to the same effect a 5 channel amp).

-Brian

ratza 24th January 2009 10:20 AM

Quote:

Originally posted by BrianGT
My only major concern is leaving enough clearance to attach the chip to the heatsink. I believe that with the large caps pushed back, an angled screwdriver should be able to screw the board into the heatsink.

--
Brian


On my amplifiers I placed the screws behind the heatsink and the nut + washer on the chip or transistors, so this might be an option.

raypalmer 24th January 2009 06:58 PM

I love them! I hope it's ready by the time I start my monoblok project.

Ted205 24th January 2009 07:44 PM

would be a shame to have the psu connected as the only option. :)


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