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Old 6th April 2010, 08:20 AM   #71
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by Elvee View Post
I think you dismiss this circuit a bit too quickly: it is very smart and clever indeed (what else would you expect from Eva?..).
It looks like a variation on the Xquad, but without some of its problems.
The accuracy and linearity, compared to a plain differential, are outstanding: practically one order of magnitude improvement.
Sorry, I don't know about Eva, there are many amp marked EVA and don't know them. I've seen Eva's class-D thread, but not all of it.
I'm really can't placing this good stuff in my follower amp. This Amp is class-H multi step with MOSFET as final, driven by fast 5A peak driver to eliminate crossover and switch distortion. Unlike BJT, big MOSFET has big drain-source capacitance that makes difficult for class-H. 10-15MHz small oscillation always happened in crossover and rail switching recovery, and this Xquad can't handle this condition. Currently I'm using 4x2sc3355 for my input stage.
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Old 6th April 2010, 05:14 PM   #72
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hi eva
I cant open image
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Old 7th April 2010, 07:05 AM   #73
ontoaba is offline ontoaba  Indonesia
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hi umut, you ask the same.

Hi elvee, this is H6660L(older) driver stage faillure, 1A peak driver. PNP input stage. Btw, do you know when this project continued? might I'll help.

I've moved from class-D because the component limit make me stack in no improvement. Then I'm trying to create digital power source, and this become component limited too.
There also EEEngine from yamaha starting beating class-D amps, and other like tripath no news (may be stacked too). I've heard that crown class-D driving motors at industries, this is bad.
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