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Old 4th October 2008, 03:47 PM   #1
pebo is offline pebo  Germany
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Default Looking for a PCB or layout for an LME49830 amp

Hi,

are there PCB or layout files for an LME49830 amplifier? Beside the boards offered by CP Design, which has no price information on its web site at the moment ("under construction").



Peter
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Old 4th October 2008, 04:20 PM   #2
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Did you look on the data-sheet? Just take their layout for the demo board.
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Old 4th October 2008, 05:17 PM   #3
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I hope this is help

"http://www.chip-pcb.cn/en/M-9830-A.htm"
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Old 14th October 2008, 06:29 PM   #4
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If you want what is shown in the application note (AN-1850) then just go to National's site and download the Gerber files. Here is the link:

http://www.national.com/analog/audio...luation_boards

-SL
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Old 14th October 2008, 06:40 PM   #5
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Aren't the diagrams of the board shot at 100% ? -- if so you can print the adobe file on overhead transparency material, and, using some photosensitive board -- burn your own PCB's in a bout an hour. this is what I do.

Even if the diagrams are not shot at 100% you can use the scale feature in adobe acrobat to print to your desired magnification.
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Old 20th October 2008, 08:25 PM   #6
pebo is offline pebo  Germany
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Hi


thanks a lot for your replies. I think I will give the gerber files a try first.

Peter

BTW: CP Design's PayPal Chart will be operational until end of the week they informed me.
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Old 14th January 2009, 12:39 PM   #7
tnargs is offline tnargs  Australia
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If there was to be a GB for the PCB in AN-1850, I would join up.

It's a pretty darned exciting and highly flexible circuit, should suit many DIY people.

I can't figure out if the chip-pcb offering is the full schematic from AN-1850, or "similar". The layout is definitely different.
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Old 26th January 2017, 04:46 PM   #8
floeper is offline floeper  Netherlands
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Hi All,

i just bought 2x amp kit second hand, the board is from cp design. it has 1 lme49830 and 4xirfp9240 and 1x c5171. I have 2x PSU for these amps as well.

I'm looking for more info regarding supply voltages. PSU has caps rated at 71V, according to ti info +-65VDC is recomanded. can anybody help me? I cannot find any info with google. only other lme49830 designs pop up.

Thanks,

Coen
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Old 28th January 2017, 10:37 AM   #9
AndrewT is offline AndrewT  Scotland
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I don't know of any electrolytic capacitors rated @ 71V ("PSU has caps rated at 71V,")

They are generally available in 63V, 75V, 80V and 100V ratings for long term use.
Each manufacturer has ratings for slight overload for the short term and again overload rating for very short term transients.

You choose the transformer you need to meet your power output requirements.
From there you can calculate or measure the worst case voltages out of the PSU.
You buy capacitors that are rated higher than the worst case highest output voltage.
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Old 3rd February 2017, 12:21 PM   #10
floeper is offline floeper  Netherlands
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i checked, 71V is noted on the caps themselfs.

But what kind of transformer do I need for this amp?
2x46VAC 500VA per amp module (gives me 2x 65VDC), but I also need secondary voltage supply, how many would that be?
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