My New amp's - Page 2

X.G. · 28th February 2005, 04:49 AM

Making the VAS current larger by lower the load resistor value would lower the open gain...another method to lift the drive current of ciss is adding drive bjt for upper mosfet.

the reason?...

except for the pole of VAS,the output stage supply another pole.I think,higher the non-main-pole freq is,more stable the amp is....and larger the Ciss drive current can reduce the hi-freq distoration.

BTW: your PSU sch miss the correct draw of IRFP9240

cheers

X.G.

Leolabs · 28th February 2005, 07:25 AM

Just wondering why use boostrap instead of current sink at the Class A driver???Is it because this circuitry was taken from IR's application notes ???

jleaman · 28th February 2005, 07:28 AM

Yes.. it was taken from ir's application notes 3 years ago and fiddled with and played with in different spot. I still cant find there Schematic that they had out a while back : O )

edl · 28th February 2005, 02:47 PM

IR's design

jleaman · 2nd March 2005, 09:42 PM

Thanks for the link : O )do yohave the aplication's nots or the parts list ? Please...

Also i have recieved my original amps back in my hands ill be playing with them again this weekend.

Jason

jleaman · 10th March 2005, 08:09 PM

Board layout. Any comment's..

edl · 10th March 2005, 08:46 PM

Quote:

Originally posted by jleaman
Thanks for the link : O )do yohave the aplication's nots or the parts list ? Please...

Also i have recieved my original amps back in my hands ill be playing with them again this weekend.

Jason

sorry, I only have the shema.

jleaman · 10th March 2005, 09:43 PM

Quote:

Originally posted by edl

sorry, I only have the shema.

That's Ok. I was just wondering so i can add it to the papers that i have..

lineup · 21st December 2006, 02:00 PM

Quote:

Originally posted by jleaman
And the Board Right after i blew a output. I have added 2 x IRFP240's to each channel now much stronger and more stable : O )

jleaman

your nice board in this picture:
http://www.diyaudio.com/forums/attac...amp=1109495903

What kind of material is that?
Looks like a some brick of stone or ceramic.
I have never seen anything like it.

At least it do not look as PCB Plastic Circuit Board.
Maybe you have painted a normal board with silver colour ...

Regards and Thanks
lineup

edl · 21st December 2006, 04:02 PM

For me that's a simple PCB on that picture...
Nothing special...

28th February 2005, 07:28 AM	#13
jleaman diyAudio Member Join Date: Apr 2002 Location: Nanaimo	Yes.. it was taken from ir's application notes 3 years ago and fiddled with and played with in different spot. I still cant find there Schematic that they had out a while back : O ) __________________ Baby Danika, Born January 20th 1:54am.. http://itsparks.dyndns.orgMix a LittleUntangle&Opendns.org Perfect..

2nd March 2005, 09:42 PM	#15
jleaman diyAudio Member Join Date: Apr 2002 Location: Nanaimo	Thanks for the link : O )do yohave the aplication's nots or the parts list ? Please... Also i have recieved my original amps back in my hands ill be playing with them again this weekend. Jason __________________ Baby Danika, Born January 20th 1:54am.. http://itsparks.dyndns.orgMix a LittleUntangle&Opendns.org Perfect..

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th February 2005, 04:49 AM	#11
X.G. diyAudio Member Join Date: Sep 2003 Location: GuangDong China	Making the VAS current larger by lower the load resistor value would lower the open gain...another method to lift the drive current of ciss is adding drive bjt for upper mosfet. the reason?... except for the pole of VAS,the output stage supply another pole.I think,higher the non-main-pole freq is,more stable the amp is....and larger the Ciss drive current can reduce the hi-freq distoration. BTW: your PSU sch miss the correct draw of IRFP9240 cheers X.G.

28th February 2005, 07:25 AM	#12
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Just wondering why use boostrap instead of current sink at the Class A driver???Is it because this circuitry was taken from IR's application notes ???

28th February 2005, 02:47 PM	#14
edl diyAudio Member Join Date: Oct 2004	IR's design

21st December 2006, 04:02 PM	#20
edl diyAudio Member Join Date: Oct 2004	For me that's a simple PCB on that picture... Nothing special...

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)