National LME49810TB/LME49830TB UltraHighFidelity HighPower Amplifier Reference Design

[KLe]

Has anybody used these yet? ... or know much about them?

[ttan98]

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.

[KLe]

Hi ttan98
Excellent ...
How did you modify it, what have you compared it too and which one have you used ...

[ttan98]

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.

[KLe]

Thanks ttan98

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

[lineup]

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.

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)

http://www.chip-pcb.cn/en/M-9830-A.htm

[KLe]

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?

[AndrewT]

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)?

[KLe]

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?

[AndrewT]

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.