"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets

[dymoneum]

the IC is a very nice circuit, unfortunately the LME is obsolete since not so long time seems that TI wanted to sell more of their own class D solutions instead of the old school class AB circuit... i designed an amplifier with the LME which is going 6 times in a dsp based 6 channel active speaker system but with my own pcb layout. good that i have saved some spare parts when i designed them 3 years ago...

 

[Fariz]

Hi...I know this is old thred
I have planning to build this Lme49830 with a pair K1058 J162, I use toroid talema 2x25volt 225va, how the output will be? Thanks for answer..

 

[UrSv]

Anybody interested in 2x PCBs, 2x2 ALFETs and 2x LME49830 ICs? I will never finish them...

 

[Fariz]

Anybody interested in 2x PCBs, 2x2 ALFETs and 2x LME49830 ICs? I will never finish them...

Hi...UrSv
I need 2x Lme49830 ICs and mosfet also

 

[UrSv]

Hi...UrSv
I need 2x Lme49830 ICs and mosfet also

OK, I'd prefer to sell all of it.

 

[Fariz]

OK, I'd prefer to sell all of it.

Dear UrSv,

Pls give me a link on ebay for 2xLME49830 and 2xPcb ?

 

[jacques antoine]

Anybody interested in 2x PCBs, 2x2 ALFETs and 2x LME49830 ICs? I will never finish them...

Hi UrSv,

Which schematics did you use ?
Cheers,

Jacques

 

[UrSv]

Hi UrSv,

Which schematics did you use ?
Cheers,

Jacques

The one from the GB.

 

[cesarev]

LM49830 --- how much current needs

hi,

how much Ampere the power supply needs to make this integrated (LM49830) work well ?
Thank you very much for your help...


Cesare

 

[cesarev]

hi,

how much Ampere the power supply needs to make this integrated (LM49830) work well ?
Thank you very much for your help...
Cesare

or the "transformer".......
thanks.......

 

[multisync]

The power requirements for the transformer is dependent on your final design. 25 watt output 100 watt output 150 watt output, mono, stereo, 5 channel? 4 ohm 8ohm?

I used a transformer from an old Kenwood stereo amplifier.

 

[cesarev]

HI, thank you for your kind reply

The power requirements for the transformer is dependent on your final design. 25 watt output 100 watt output 150 watt output, mono, stereo, 5 channel? 4 ohm 8ohm?
I used a transformer from an old Kenwood stereo amplifier.

yes ok
but I'm interested know how much current (LM49830) use the integrated for work???
something like ( drive current, 56mA ) for work +/- at 62Vdc
…
Thankks....... Cesare..........by Venice

 

[multisync]

from the data sheet Idle current is around 19 ma typical max is 24 ma with no load.
from the data sheet max output current is 54 ma
so worst case 24 + 54 ma

here is the data sheet

 

[cesarev]

from the data sheet Idle current is around 19 ma typical max is 24 ma with no load.
from the data sheet max output current is 54 ma
so worst case 24 + 54 ma
here is the data sheet

so with a 30VA(ma650X2) transformer I'm more than safe.
Many thanks "multisync".....


have a good day.......... Cesare from Venice

 

[Fariz]

Dear All,
How to setting bias LME49830 based on this schematic, I use a pair mosfet 2SK1058/2SJ162.

An externally hosted image should be here but it was not working when we last tested it.

 

[giaspyr]

3U and 4 channels can work perfectly:
http://www.diyaudio.com/forums/soli...84.html?highlight=sa2012+lme49830#post4643484
and
http://www.diyaudio.com/forums/soli...65.html?highlight=sa2012+lme49830#post3753565

4 x 190W@8R, about 250 - 300 mA bias total per channel. 3 Pair IRFP240/9240 per channel.

2 of 4 channel can deliver the 190W continuous without heat problems.
Maybe you need 5U cooling if you plan to deliver all 4 channels full power continuous.

BR, Toni

Hi Toni, I have finished your SA2012 power amp using your pcb boards and I have a question please.
I am using +- 74Vdc lines, if biasing the fets using a 1.0 ohm resistor in series to the rails what is the desirable voltage drop across it?

 

[astx]

Dear giaspyr,

1R, 250mV drop is 250mA.

 

[giaspyr]

I've seen that you're mentioning biasing at 250-300mA but it seemed a lot to me that is why I asked.
If I bias the fets at 100-120mA shall I get higher crossover distortion or what?

 

[astx]

Total bias for the three pairs is 250-300mA. To get the first watt in class A. lower bias works too but with higher distortions.

 

[giaspyr]

Thanks for the info, I was just curious.