Most ultimate ClassA/B Amplifier in order to economical Operation with Battery

[tiefbassuebertr]

I am looking for a circuit diagram for a high efficiency amplifier with low output power (for high efficiency driver), low idle current but good sound (for a mobile and battery powered loudspeaker).
What amplifier circuit should I get on the short list (except class-D) ?
Both chip amp and discrete solutions are of interest.
Thanks for advices.

 

[banat]

Hi Tiefbass !

I guess that you need amps powered from car or motorcycle 12V battery ,
here is some ancient schematics of low power but very very good sounding a/B class amps , newer generation BJT devices can be implemented with easy .

Best Regards

 

[Elvee]

Here is an example of a 3-transistor, rail-to-rail output amplifier:
http://www.diyaudio.com/forums/soli...-mini-transistor-amplifier-5.html#post2904409

 

[JonSnell Electronic]

A TDA2030 has very low distortion, very low idle current and is cheap to make. On 12v you can get up to 14Watts.
TDA2030 Datasheet(PDF) - STMicroelectronics

 

[abraxalito]

LM4752 is very frugal in Iq so long as you don't need more than 2A output current. There's also its rather measly 2V/uS slew rate to contend with which rather restricts its full-swing bandwidth to under 20kHz.

 

[Mooly]

I was going to say TDA2050 (4 ohm rated). See Jon has similar-ish ideas 🙂

 

[xrk971]

TDA7297, aka "Lunch Money Amp". Despite its humble sub $5 (complete amp) origins - with proper high quality low ESR rail caps and good input film caps, it's capable of excellent (superb actually) sound. Runs very cool at 12v, but when I push it with 18v, can be quite warm.

In stock form, it looks like this (simply change the big elco and small 0.22uF input caps to get a big upgrade in SQ):

More info here:
http://www.diyaudio.com/forums/chip-amps/231988-what-heck-its-less-than-lunch.html


Here it is in full-blown OS Destroyer (Folsom Audio) - modified form with TL431 shunt regulated PSU and running at 18v. You can always use the Folsom Audio board for better sound - just skip the shunt regulator at 12v for max efficiency:

 

[wahab]

A TDA2030 has very low distortion, very low idle current and is cheap to make. On 12v you can get up to 14Watts.
TDA2030 Datasheet(PDF) - STMicroelectronics

It s 14W/4R with +-12V.

FTR TDA 20X0 amps are not equal, the TDA 2030 is the most linear while TDA 2040 allow higher but also lower operating voltage (5V) as well as bigger output current, this is the most adequate for single rail 12V, eventually bridged..

 

[tiefbassuebertr]

Thank you very much for all advices.

A TDA2030 has very low distortion, very low idle current and is cheap to make. On 12v you can get up to 14Watts.
TDA2030 Datasheet(PDF) - STMicroelectronics

Is the sound quality comparable to those from the amplifier concept under
http://www.diyaudio.com/forums/chip-amps/123255-beginners-gainclone-hifi-lm1875-amplifier-board.html ?