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Old 28th April 2013, 06:25 PM   #21
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Zero DC and canceling of rail hum at 50% duty cycle...
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Old 28th April 2013, 11:49 PM   #22
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U r right.....Practicaly this is easy and works.....and it is killing high frequency from audio spectrum too.I tested this many times......And decided to kill hum on input side.....Now i have perfect high frequencies from audio,with very small bypass caps.....We agreed about one thing,hum is very high frequency.
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Old 30th April 2013, 01:00 AM   #23
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I found one more thing too.guy deleted ground on output stages .... he did everything to show something and to prevent everything.This schematic works fantastic.
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Old 30th April 2013, 01:02 AM   #24
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Are you going to build it ?
It will be interesting to see how good it sounds.
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Old 30th April 2013, 09:07 AM   #25
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I already made it , triangle wave is perfect.I made everything in modules to test it and it works perfect(very messy setup ).Probably i will make proper layout in Protel and assemble it as one design.I am to bussy now but in next few weeks probably i will make it.
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Old 3rd May 2013, 09:17 PM   #26
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Well,some more fixes

I defined few things here.Max modulation and highest efficiency is possible on frequencies at am of 65KHz couse comparator is slow.Also few caps r making performances to be lower than they can be good.
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Old 3rd May 2013, 09:32 PM   #27
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Quote:
Originally Posted by Mikelandjelo View Post
Well,some more fixes

I defined few things here.Max modulation and highest efficiency is possible on frequencies at am of 65KHz couse comparator is slow.Also few caps r making performances to be lower than they can be good.
I think those capacitors were to slow down switch on of mosfets.

Another method is to discharge mosfet gate through a diode but charge it up through say 10 ohms.
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Old 5th May 2013, 08:18 PM   #28
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C5,C6,C11,C12 are for dead time adjustment.
The required values will depend on the chosen MosFets, chosen gate drive impedances and the desired trade off regarding idle losses vs dead time distortion.
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Old 6th May 2013, 12:43 AM   #29
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Also diodes for fast turn off r needed on gates.
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