Single sided PCb for lm4780

rs1026 · 22nd August 2004, 10:53 AM

Hi,

Does anyone have a single sided PCB design pictures for LM4780?
I wanted to try out this amp but as a starting point i would like to experiment with a single sided PCB instead of two sided.

Thanks in advance.

Upupa Epops · 22nd August 2004, 11:22 AM

With one sided PCB you can't to get with this circuit optimal configuration - forget on it.

soundNERD · 22nd August 2004, 12:33 PM

I know there was one, but I can't remember where. Try a google search.

rs1026 · 22nd August 2004, 01:58 PM

thanks Upupa, so two sided is better is it? What about the pcb design given on national's website/datasheet. Is it good enough?
If thats better then I will build a two sided one. So far I havent tried my hands on two sided pcbs.Will have to give it a shot to see how it goes..

carlmart · 22nd August 2004, 02:07 PM

Quote:

Originally posted by Upupa Epops
With one sided PCB you can't to get with this circuit optimal configuration - forget on it.

Which would be optimal configuration? Using a ground plane?

Carlos

carlmart · 22nd August 2004, 02:10 PM

Quote:

Originally posted by soundNERD
I know there was one, but I can't remember where. Try a google search.

Here it is:

http://hepso.dna.fi/misc/lm4780/lm4780-pcb.pdf

Carlos

soundNERD · 22nd August 2004, 04:24 PM

yep, thats it.

Thanks

Upupa Epops · 22nd August 2004, 04:37 PM

To rs1026 : PCB on datasheet is " electricaly " optimal, but not nice

- " optimal and nice " is my version

. How you will see, design of both sided PCB is much more easy than one sided.
To carlmart : This showed PCB is typical example of " nonoptimal " solution : too long thin traces with too high current density on rails and output. Problems with resoldering of LM.

meta · 22nd August 2004, 07:29 PM

Hey...

I just built my 1st gc amp and have since whiped up a single sided layout for a dual 3886 brd:

Dunno if the design is 'optimal' (i was aiming for that * gnd method)...neways, there's no hum or hiss and it's workin just great

Upupa Epops · 22nd August 2004, 07:59 PM

With 3886 is it easy, 'cos distance of pins is great, but question was about 4780

.

22nd August 2004, 10:53 AM	#1
rs1026 diyAudio Member Join Date: Jul 2004 Location: Bangalore	Single sided PCb for lm4780 Hi, Does anyone have a single sided PCB design pictures for LM4780? I wanted to try out this amp but as a starting point i would like to experiment with a single sided PCB instead of two sided. Thanks in advance.

22nd August 2004, 01:58 PM	#4
rs1026 diyAudio Member Join Date: Jul 2004 Location: Bangalore	Then two sided is beeter is it? thanks Upupa, so two sided is better is it? What about the pcb design given on national's website/datasheet. Is it good enough? If thats better then I will build a two sided one. So far I havent tried my hands on two sided pcbs.Will have to give it a shot to see how it goes..

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22nd August 2004, 11:22 AM	#2
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	With one sided PCB you can't to get with this circuit optimal configuration - forget on it.

22nd August 2004, 12:33 PM	#3
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	I know there was one, but I can't remember where. Try a google search.

22nd August 2004, 04:24 PM	#7
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	yep, thats it. Thanks

22nd August 2004, 04:37 PM	#8
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	To rs1026 : PCB on datasheet is " electricaly " optimal, but not nice - " optimal and nice " is my version . How you will see, design of both sided PCB is much more easy than one sided. To carlmart : This showed PCB is typical example of " nonoptimal " solution : too long thin traces with too high current density on rails and output. Problems with resoldering of LM.

22nd August 2004, 07:29 PM	#9
meta diyAudio Member Join Date: Nov 2002 Location: London	Hey... I just built my 1st gc amp and have since whiped up a single sided layout for a dual 3886 brd: Dunno if the design is 'optimal' (i was aiming for that * gnd method)...neways, there's no hum or hiss and it's workin just great

22nd August 2004, 07:59 PM	#10
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	With 3886 is it easy, 'cos distance of pins is great, but question was about 4780 .

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