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Old 12th February 2005, 03:06 PM   #1
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Lightbulb LM4780 Bridged PCB Design

Here is my design for a bridged LM4780. The circut follows the data sheet with the exception that the two GND pins go to the signal ground via a resistor (1-3ohm). I also opted not to put the caps on the input, I may yet add them to the board.
Also I'm sure you will notice that the supply caps are quite small, I could change the orientation and add larger ones, but I was intending on using a regulated supply. My main question is regarding the 2 caps CSN1 and CSN2, these go from the resistors on the output to ground, the recomended value is 0.1uF...what type of cap should I be using here, and have I allowed enough space for them.

The boards are about 2/3 the size of the BrianGT LM3875.

If anyone is interested I can post the Eagle PCB file.

Thanks for your help
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File Type: jpg lm4780 bridged.jpg (89.3 KB, 697 views)
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Old 12th February 2005, 05:57 PM   #2
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Lightbulb Eagle File

Here is the eagle file for this design. I made the supply traces a bit wider to accomodate a wider variety of capacitors, other than that it is pretty much the same.
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File Type: zip lm4780 bridged.zip (4.0 KB, 198 views)
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Old 13th February 2005, 02:47 PM   #3
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Default LM4780 ChipAmp

Could you post a PDF file of your board with dimensions? I don't have a way to view the eagle PCB file.

I'm interested in building multi-channel amps using these.

Thanks,

SonicBooMan
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Old 14th February 2005, 01:50 AM   #4
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Default Re: LM4780 ChipAmp

Quote:
Originally posted by SonicBooMan
Could you post a PDF file of your board with dimensions? I don't have a way to view the eagle PCB file.

I'm interested in building multi-channel amps using these.

Thanks,

SonicBooMan
Glad to see somone is showing some interest. You would be better off downloading a copy of Eagle from cadsoft.de it is free software. This will allow you to print and modify this design however you see fit. I have yet to etch any boards with this design, and am currently looking for suggestions as to the layout, grounding etc. I will post any progress here. My plan is also to use these for a multichannel amp, perhaps 6 channels with a 750 VA transformer for 3 channels Obviously this will be for an HT setup. I realize that BrianGT has some very nice parallel boards but I am looking for something with a bit more output, impedence is not a problem as all my speakers are well behaved 8ohm.

G.
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