D AMP is back !!!

alexclaire · 22nd March 2007, 08:28 PM

Hi everyone,

D amp Proto is running fine !

Dead time adjustments made...sound is great !

here are some pics of the proto:

post filter output voltage ripple 4Vpp@ 250kHz

no shoot through anymore ;-)

thanks Fredos

alexclaire · 22nd March 2007, 08:32 PM

another one of the proto :

alexclaire · 22nd March 2007, 08:33 PM

and i forgot
output DC offset : 18mV

mgm2000ro · 22nd March 2007, 09:50 PM

WOW!!
Super!

fredos · 23rd March 2007, 06:37 PM

Nice!

Fredos

alexclaire · 23rd March 2007, 08:06 PM

Hi everyone

just a little question for Fredos

with no load, the amp has sometimes trouble to start...
maybe because of the feedback loop : loudspeaker is part of the output filter ;-)

I think it's normal (amp with no load isn't a usual way to do !!)

zilog · 23rd March 2007, 08:15 PM

How do you take care of the gate voltage supply for the high side FET? Maybe your schematic requires grounding through the load in order to transfer charge to this supply.

alexclaire · 23rd March 2007, 11:33 PM

Hi Zilog,

Supply of the upper fet is made by bootstrap diode and capacitor through the load you're right !

luka · 24th March 2007, 06:01 AM

Hi

Isn't 4Vpp at 250kHz a bit too much? Is this because of series resistance of filter cap in output filter?

luka · 24th March 2007, 08:53 AM

Hi

And what is your supply DC voltage when the amp is idle on what when at full power?

24th March 2007, 06:01 AM	#9
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi Isn't 4Vpp at 250kHz a bit too much? Is this because of series resistance of filter cap in output filter? __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

24th March 2007, 08:53 AM	#10
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi And what is your supply DC voltage when the amp is idle on what when at full power? __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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22nd March 2007, 08:33 PM	#3
alexclaire diyAudio Member Join Date: May 2005 Location: Avesnes/Helpe	and i forgot output DC offset : 18mV

22nd March 2007, 09:50 PM	#4
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	WOW!! Super!

23rd March 2007, 06:37 PM	#5
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	Nice! Fredos

23rd March 2007, 08:06 PM	#6
alexclaire diyAudio Member Join Date: May 2005 Location: Avesnes/Helpe	Hi everyone just a little question for Fredos with no load, the amp has sometimes trouble to start... maybe because of the feedback loop : loudspeaker is part of the output filter ;-) I think it's normal (amp with no load isn't a usual way to do !!)

23rd March 2007, 08:15 PM	#7
zilog diyAudio Member Join Date: Oct 2005	How do you take care of the gate voltage supply for the high side FET? Maybe your schematic requires grounding through the load in order to transfer charge to this supply.

23rd March 2007, 11:33 PM	#8
alexclaire diyAudio Member Join Date: May 2005 Location: Avesnes/Helpe	Hi Zilog, Supply of the upper fet is made by bootstrap diode and capacitor through the load you're right !

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