4780 3in1 single sided

gmphadte · 7th March 2006, 09:27 AM

Here is my final pcb design for 4780 for all three purposes. Stereo, parallel and bridged. Can anyone EAGLIze it and republish as a picture.

comments are welcome.

Gajanan Phadte

gmphadte · 7th March 2006, 09:45 AM

I am interested in proper spacing as is difficult by Wordart

Sanouske · 7th March 2006, 11:30 AM

gday mate, looking at ur pcb looks to be in order, however im not obverly sure with the set up ur planning on running. would you be able to give me some of ur info or what ever you've got, and ill run some more looks over it

only concern atm would be some of the rail u have, might be a tad to small, but again it might be a low voltage rail, and mightnt have any probs with it at all.

cheers mate, gimme a yell back when you can.
Sanouske

gmphadte · 8th March 2006, 03:11 AM

thanks Sanouske

The PCB as it is is ready for Reference schematic (fig.7)
as on LM4780 datasheet pdf

Blue are resistors, purple are capacitors
Extension on solder points are jumpers

Other configurations...
Mandatory jumpers - 3 near IC and 1 near SPKR.
L is parallel/bridged input
R11, R12 for parallel only. Short SPKR terminals
Install jumper between R1(1) and R2(1) for parallel only
R1, R4=short for bridged
For Bridged, swap jumper near star gnd
For 2 channels(stereo), no modifications required
C11, C12 for reference PCB schematic

Gajanan Phadte

Wombat2 · 9th March 2006, 12:57 AM

Can anyone tell me if the reference board artwork for the LM4780/1 is available full size? When I try to double the size of the drawings in the datasheet it looses definition.

Wombat2 · 9th March 2006, 02:02 AM

I can answer my own question - found them here http://www.national.com/appinfo/audi...19,968,00.html

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7th March 2006, 09:45 AM	#2
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	I am interested in proper spacing as is difficult by Wordart

7th March 2006, 11:30 AM	#3
Sanouske diyAudio Member Join Date: Mar 2006 Location: Brisbane, QLD	gday mate, looking at ur pcb looks to be in order, however im not obverly sure with the set up ur planning on running. would you be able to give me some of ur info or what ever you've got, and ill run some more looks over it only concern atm would be some of the rail u have, might be a tad to small, but again it might be a low voltage rail, and mightnt have any probs with it at all. cheers mate, gimme a yell back when you can. Sanouske

8th March 2006, 03:11 AM	#4
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	thanks Sanouske The PCB as it is is ready for Reference schematic (fig.7) as on LM4780 datasheet pdf Blue are resistors, purple are capacitors Extension on solder points are jumpers Other configurations... Mandatory jumpers - 3 near IC and 1 near SPKR. L is parallel/bridged input R11, R12 for parallel only. Short SPKR terminals Install jumper between R1(1) and R2(1) for parallel only R1, R4=short for bridged For Bridged, swap jumper near star gnd For 2 channels(stereo), no modifications required C11, C12 for reference PCB schematic Gajanan Phadte

9th March 2006, 12:57 AM	#5
Wombat2 diyAudio Member Join Date: Nov 2003 Location: Brisbane	Can anyone tell me if the reference board artwork for the LM4780/1 is available full size? When I try to double the size of the drawings in the datasheet it looses definition.

9th March 2006, 02:02 AM	#6
Wombat2 diyAudio Member Join Date: Nov 2003 Location: Brisbane	I can answer my own question - found them here http://www.national.com/appinfo/audi...19,968,00.html

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