Group order of LM4780 PCB boards

[digi01]

Hi gays,I have designed two LM4780 pcb projects.One is standard two channel stereo amps,one is in parallel.The boards size is 127mm x 72.5mm,double-sided pcb,single chip.
the prices of small batchs is $20 USD/1PCB,30 pieces boards.If more, prices can also be reduced.
this is parallel layout projects,the standard stereo projects with the size of the parallel similar,same boards.you can use it make a stereo amplifier.

anyone interested?

this is my WIKI page.

-digi

 

[arthur]

its too expensive for a such a small pcb
worth less than RMB 20(US 3) each

 

[li_gangyi]

I'll take a few if the shipping to Singapore doesn't kill me...

 

[digi01]

for li_gangyi,
shipping to Singapore,no problems Do you like the standard or parallel? I can make to order 0.1% resistors for the parallel boards use.Who has better suggestion?

 

[arthur]

the fallowing link offer a lm3886 pcb at a price of US 5

http://www.my3c.net/product/detail.asp?ky=&pid=501&sgid=98&gid=7&gid2=&Sort=&Price=

 

[garbage]

hi li_gangyi

are you able to get hold of the LM4780s in Singapore?
do let me know where i can get them.

digi01, for $20/pcb, does it come with any components?

 

[li_gangyi]

well national is offering some as samples...and Farnell carries them...
www.national.com

 

[garbage]

i just checked farnell's site. they do not have LM4780. :|

 

[li_gangyi]

hmm...then I guess you'll need to get them straight from national...

 

[digi01]

digi01, for $20/pcb, does it come with any components?

the boards including Input-output interface socket, and the regular screws.
NS 4780 price is $3.25 Qty 1K+,straight from national.I find some distributors of beijing china:
http://www.national.com/contacts/Details/0,1596,China,00.html
the price is good
I like discussing more technological details even more, making this project more perfect. I have designed a 4780 of bridge mode again.

-digi

 

[jhead]

DO you have photos of finished boards 0r of the unfinished boards

 

[digi01]

jhead,It is still only a project file now, there is not real thing.

this is my standard stereo layout projects

 

[digi01]

bridge mode layout projects

 

[RFScheer]

Looonnnggg tracks

Digi,

All of the paths in your layout are kinda long and so it'll be interesting to see how well this works. I'm worried about mains buzz (ground loops) and poor response due to inductances. Also, what are the component values and types?

Is the board really 3 x 5 inches??? Why so big??

What are the goals of this project?

-Robert

 

[digi01]

I use top-down layout technology,and star type ground wire(no ground loops).it's can effective driving away buzz.The shortcoming of this technology is a long track, there are boards to be kept and offer some space for the stars ground but it have really good performance and looks beautiful.


-digi

 

[digi01]

What are the goals of this project?

I am not clear. . . But I want to make into the real thing, I like pcb layout and design, it is one art in my view.
Hope that there are more responses.