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.
http://www.chip-pcb.cn/
cheap too, DHL postage IS expensive.
I modified it it sounded even better.
KLe said: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.
ttan98 said:
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.
An externally hosted image should be here but it was not working when we last tested it.
http://www.chip-pcb.cn/en/M-9830-A.htm
Attachments
Hi Andrew
LME49830TB ... US$** ea c/w heatsink, PCB, and parts ... and 100 watts RMS ...
LME49810TB ... US$135 ea c/w heatsink, PCB, and parts ... and 100 watts RMS. Unique to the LME49810 is an internal Baker Clamp. This clamp insures that the amplifier output does not saturate when over driven.
I think that's what it says ... bit hard to workout the prices?
LME49830TB ... US$** 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?
KLe said:
AndrewT said:
LME49810 is perhaps the best peforming chip.
At least when used with BIPOLAR Power transistors.
And AndrewT is right. Because LME49830 are to drive MOSFET.
For example IRFxxx/IRF9xxx.
But I know LME49830 has been tested with LATERAL MOSFET, as well
Like 2SK1058 / 2SJ162
See some testdata in this National application PDF, for LME49830
AN-1850: LME49830TB Ultra-High Fidelity High Power Amplifier Reference Design
http://www.national.com/an/AN/AN-1850.pdf
Lineup regars
We can make a quick compare in this page:
http://www.chip-pcb.cn/en/LME49810.htm
LM4702 and LME49811 are the older chips.
They were to drive darlington power devices.
The output current was not good enough to drive normal BJT or MOSFET.
5.5 and 9 mA is not enough.
Comparing new chips LME49810 and LME49830,
we see they have good DRIVE output current:
60 / 56 mA
LME49810 has higher Slewrate (=faster) and a bit better PSRR.
LME49830, for MOSFET, has a bit lower Output noise,
and the Slewrate 39V/uS is still very good.
I would not say 49810 is superior, but it is overall a little bit better data.
How good ampifier you get, in the end, using LME49830/LME49810,
is probably MORE dependent on your used circuit
+ how good your pratical amplifier build and PCB is done.
That is how small the difference is ....
Regars Lineup
http://www.chip-pcb.cn/en/LME49810.htm
LM4702 and LME49811 are the older chips.
They were to drive darlington power devices.
The output current was not good enough to drive normal BJT or MOSFET.
5.5 and 9 mA is not enough.
Comparing new chips LME49810 and LME49830,
we see they have good DRIVE output current:
60 / 56 mA
LME49810 has higher Slewrate (=faster) and a bit better PSRR.
LME49830, for MOSFET, has a bit lower Output noise,
and the Slewrate 39V/uS is still very good.
I would not say 49810 is superior, but it is overall a little bit better data.
How good ampifier you get, in the end, using LME49830/LME49810,
is probably MORE dependent on your used circuit
+ how good your pratical amplifier build and PCB is done.
That is how small the difference is ....
Regars Lineup
With LME49830,
and using 50 mA drive current,
I would say you will easily drive 2 parallel pairs of powerful TO-247 MOSFET.
Maybe even 3 pairs of IRFP240/IRFP9240.
If anyone wants to go for high powers using HEXFET
I can recommend some of the best commonly available power types:
http://www.irf.com/product-info/datasheets/data/irfp264n.pdf
http://www.irf.com/product-info/datasheets/data/irfp260n.pdf
IRFP264N, 380 Watt, 44 Ampere
IRFP260N, 300 Watt, 50 Ampere
The 'N' is important
Because the 'N' versions have higher (+175C) max junction temp = can take more power.
The hook to those N-MOS is of course to find suitable P-MOS to complements ....
But for N-Channel amplifiers, like Quasi does it, IRFP260N or IRFP264N should be my choice.
They are so powerful you will not need to parallel, unless you are trying to get Too Much power
Otherwise a good complementary N+P pair that Nelson Pass uses frequently is:
IRFP240 & IRFP9240
I do not know if those comes in 'N' versions?
and using 50 mA drive current,
I would say you will easily drive 2 parallel pairs of powerful TO-247 MOSFET.
Maybe even 3 pairs of IRFP240/IRFP9240.
If anyone wants to go for high powers using HEXFET
I can recommend some of the best commonly available power types:
http://www.irf.com/product-info/datasheets/data/irfp264n.pdf
http://www.irf.com/product-info/datasheets/data/irfp260n.pdf
IRFP264N, 380 Watt, 44 Ampere
IRFP260N, 300 Watt, 50 Ampere
The 'N' is important
Because the 'N' versions have higher (+175C) max junction temp = can take more power.
The hook to those N-MOS is of course to find suitable P-MOS to complements ....
But for N-Channel amplifiers, like Quasi does it, IRFP260N or IRFP264N should be my choice.
They are so powerful you will not need to parallel, unless you are trying to get Too Much power
Otherwise a good complementary N+P pair that Nelson Pass uses frequently is:
IRFP240 & IRFP9240
I do not know if those comes in 'N' versions?
Re: Charges
You will find the seller does not response quickly I suspect he holds another job.
China is busy preparing for the Games, so all parcels sent overseas must go through DHL(for security I think) which is very expensive, like my last purchase, parts bought, $60 and postage $60 as well. If you can wait, until Games is over then normal airmail via China Post(much cheaper) resumes, I think, confirm it with the seller.
enzedone said:
You will find the seller does not response quickly I suspect he holds another job.
China is busy preparing for the Games, so all parcels sent overseas must go through DHL(for security I think) which is very expensive, like my last purchase, parts bought, $60 and postage $60 as well. If you can wait, until Games is over then normal airmail via China Post(much cheaper) resumes, I think, confirm it with the seller.
Anyone can give me advice as below:
1) In using LM4702, LME49810 or LME49830 as driver, what is the difference in sound for using BJT or MOSFET as output stage? Which one, BJT or MOSFET will be better sound?
2) In module M-49810-A from http://www.chip-pcb.cn , 3 pairs of BJT are used per channel. The specification states as 100W/8ohm at +/- 45Vdc supply. If I increase the DC supply voltage to +/- 60Vdc and +/- 75Vdc, then the output will be 200W/8ohm and 300W/ohm respectively. Is it feasible and what problem will encounter here if I am doing so?
1) In using LM4702, LME49810 or LME49830 as driver, what is the difference in sound for using BJT or MOSFET as output stage? Which one, BJT or MOSFET will be better sound?
2) In module M-49810-A from http://www.chip-pcb.cn , 3 pairs of BJT are used per channel. The specification states as 100W/8ohm at +/- 45Vdc supply. If I increase the DC supply voltage to +/- 60Vdc and +/- 75Vdc, then the output will be 200W/8ohm and 300W/ohm respectively. Is it feasible and what problem will encounter here if I am doing so?
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