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Old 25th May 2004, 10:18 AM   #1
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Default lm4780 omniPCBs soon to be for sale

hopefully.

this is likely a limited run thing, very limited run probably.

in anycase i've been working on an easy to use, extremely versitile lm4780 board.

if you've emailed me before about these, i will email you back tomorrow with the results of the prototypes.

the board is larger though, 2.5"x2.8" (6.35 x 7.112).

the good is that the board supports many different topologies:
noninverting (AC-coupled, RF filter, and fixed volume offset options)
inverting (AC coupled option)
unbalenced differential - aka difference amplifer, often listed as a balenced to unbalenced converter, it will do this, but it doesn't have the same performance of a real balenced amplifier.

there is room for a zobel.

bridged mode is possible.
parallel mode is hopeful -- no room has been alloted on board for 0.1 ohm resistors. i have a hunch they aren't needed if you make the hookup wire long/thin enough...
stereo mode is possible.

each signal ground is seperate from powerground.

the current loop should be pretty well minimized.

there are 2 screw holes and room for connectors, thus making setup and mounting easier.

chip is mounted 1/2 inch (1.25cm) away from the PSU caps, allowing for a clamp-mounting bracket to be used.

any questions, i will try to answer.

as i said, this isn't really a group order, it's just a limited run. i tried to optimize the board for low noise and for fairly easy use. that being said, you must still be able to solder.

as i have seen, there are currently two other 4780 board out, one by brianGT and one by OddOne. if you are looking for a parallel amp with the 4780, i'd probably go with one of those, they seem to garuentee it, and mine is just "it should work".

i should be making pcbs today at 8pm. if all goes well, i will have a finished product on a scope by midnight and a review tomorrow.
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Old 6th July 2004, 09:31 AM   #2
Hughie is offline Hughie  Australia
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Join Date: May 2004
Location: Perth
Here I found and bought 4 boards for the LM4780 chips, double sided as per national board, gold plated, etc excellent quality !!
Here is the page in Korea.http://www.speaker.ne.kr/home/index.php?cmn=1&cma=

The boards can be purchased with parts as req.
My boards were $10 Aust each, plus postage. ordered Thursday, and received the next Tuesday in Perth !!!!
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Old 6th July 2004, 10:37 AM   #3
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Location: New Zealand
Default Anyone need help?

Hey Guys,
I can be the translator if you really want.
I can be your ears and mouthes
I'm a Korean

sendtojamesj@hotmail.com

Cheers,
JayJay
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