Best and most powerful DIY Chip

[livenicely]

lm3875 contain 11 pin packages. 6 pins are not in use NC . Then y these 6 pins are in package?

[ratza]

They ensure chip's stability. Otherwise it will be something like an elephant without a leg.

[livenicely]

Originally Posted by ratza

They ensure chip's stability. Otherwise it will be something like an elephant without a leg.

Ya very nice answer. Is there any need to ground them becoz they are not in use Or leave them floating

[livenicely]

lm3886 is the upgrade of lm3875 than how it possible it is possible that the lm3886 is inferior in sound quality than lm3875??????????

[ratza]

It's an upgrade regarding output power. The extra pins are not connected to anything.

[livenicely]

Than y lm3886 inferior in sound quality than lm3875

[ratza]

Yes but not by much. Depending on your sound source and speakers you might not hear the difference.

[star882]

Originally Posted by livenicely

Please if u dont mind clear it u wana say

FDP61N20 Fairchild Semiconductor MOSFETs
Only $2 each in small quantities and rated for 200v, 61A. Use 4 of them in a H bridge with a supply voltage of 150v and it can supply over 2000w into a 4 ohm load. Power semiconductors work best with a different process optimization than high speed signal circuits. Therefore, putting both on the same piece of silicon would involve compromises.

For even more power, use IGBTs, although they are generally slower than MOSFETs.

[Eva]

Class D can be quite simple once you understand how to do high power amplifiers with just a modulator/gate driver IC (like IRS2092), a pair of MOSFET, LC output filter and suitable supply capacitors. There are similar class AB driver ICs, considered chip amps, requiring just external output devices and Vbe multiplier (like LME49810).

Unfortunately, the passionate scientific point of view about electronics required to do class D is missing in most people here (build, measure, figure out the formulas, use them to improve what you don't like and repeat, forever )

It's possible to do >1000W/4 ohm amplifiers with readily available components that can do full music output without any heatsink (I have one playing on my bench). But I had to build some chip amps in the past to learn that

[GK]

Originally Posted by redrabbit

GK, see ebay item# 320448537988 (USA)

PA-03

=RR=

Oh that's OK, I don't have any need for a low bandwidth PA-03 monster. I was using PA19's as power opamps at 4MHz in a scientific instrumentation application.