National LME49810TB/LME49830TB UltraHighFidelity HighPower Amplifier Reference Design - diyAudio
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Old 16th July 2008, 02:33 AM   #1
KLe is offline KLe  Australia
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Default National LME49810TB/LME49830TB UltraHighFidelity HighPower Amplifier Reference Design

Has anybody used these yet? ... or know much about them?
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Old 16th July 2008, 02:38 AM   #2
ttan98 is offline ttan98  Australia
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I have one, playing now, ie LME49810,you csan buy it from monkey, website here:

http://www.chip-pcb.cn/

cheap too, DHL postage IS expensive.

I modified it it sounded even better.
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Old 16th July 2008, 02:44 AM   #3
KLe is offline KLe  Australia
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Hi ttan98
Excellent ...
How did you modify it, what have you compared it too and which one have you used ...

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Old 16th July 2008, 04:21 AM   #4
ttan98 is offline ttan98  Australia
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Quote:
Originally posted by KLe
Hi ttan98
Excellent ...
How did you modify it, what have you compared it too and which one have you used ...


Takes too long to explain, once I have completed the write up l will post it here.

BTW the sound of LME49810 kit is quite good for the price you pay. A worthwhile project better than normal LM3886.
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Old 16th July 2008, 09:17 AM   #5
KLe is offline KLe  Australia
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Thanks ttan98

Look forward to your writeup ... sounds like its pretty good

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Old 16th July 2008, 10:57 AM   #6
lineup is offline lineup  Sweden
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Quote:
Originally posted by ttan98

http://www.chip-pcb.cn/
cheap too, DHL postage IS expensive.
Yesterday I has problem to get that website. Timed out ....
Today it works better for me, here in Europe.
They should get some Website ( MIRROR Site ) in Europe/USA,
that would work faster for western customers.

They say now, until 31 october 2008, they have to send by DHL
( Olympic Games Security does not allow electronics by postage )

Very Good Stuff My favourite Module is this one.
Based on LME49830 + IRF240 / IRF9240.
I attach an Image of The PCB. See bottom.

Quote:
LME49830TB as the core
Mono-operation
Output stages: IRF240/9240
Output Power: 100W/8Ω Voltage=±45V
Recommended operating voltage: DC±(45~56)V
Class: AB
PCB Size: 110 x 66 mm (2mm/65um)
Click the image to open in full size.

http://www.chip-pcb.cn/en/M-9830-A.htm
Attached Images
File Type: png lme49830_chip-pcb.cn_e4.png (25.5 KB, 3762 views)
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Old 16th July 2008, 11:16 AM   #7
KLe is offline KLe  Australia
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Hi Lineup, it looks nice and simple.

Why do you prefer the LME49830TB to the LME49810TB?
and how would you rate the LME49830TB compared to a good discrete?

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Old 16th July 2008, 11:25 AM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by KLe
Hi Lineup, it looks nice and simple .

Why do you prefer the LME49830TB to the LME49810TB?

could it be because National use the 240/9240 as their example devices for the 830 chip (MosFET driver)?
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Old 16th July 2008, 11:42 AM   #9
KLe is offline KLe  Australia
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Hi Andrew

LME49830TB ... US$** ea c/w heatsink, PCB, and parts ... and 100 watts RMS ...


LME49810TB ... US$135 ea c/w heatsink, PCB, and parts ... and 100 watts RMS. Unique to the LME49810 is an internal Baker Clamp. This clamp insures that the amplifier output does not saturate when over driven.

I think that's what it says ... bit hard to workout the prices?

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Old 16th July 2008, 12:02 PM   #10
AndrewT is offline AndrewT  Scotland
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Hi Kle,
one will not get 100W into 8r0 from +-45Vdc supplies with a FET follower output stage.

I wonder if that post6 circuit is a driver+common emitter output stage?
If it's not then it's telling fibs.
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