ucd 25 watts to 1200 watts using 2 mosfets - Page 161

akraj · 19th January 2012, 04:56 PM

hmmm.....I know it is comparatively complex but it includes end to end design; surely this is tested and will be stable. I was searching for sub amp so it will serve my purpose. HOwever, CPX do you have any working amp design? would be greatful if you can share that!

CPX · 19th January 2012, 07:49 PM

There are a several working designs on this thread..if you want you can choose one..my amplifier also works and i have made lots of tests but i am still working on improuvements so i have no final schematic yet..

akraj · 22nd January 2012, 04:50 AM

Okay CPX, what do you think about the JBL schematic? I will try to draw a PCB if this is praiseworthy

CPX · 07:49 PM

That schematic is for low frequencies only..there are so many others you can use..

,what is your experience level..have you worked with switching mode power supplies before ?if so there you will be capable to use any schematic not just blindy copy one.

manojtm · 31st January 2012, 12:12 PM

Hi All

Now I will give my working design!!!!!!!!!!!!!!!
Its simple and good.Protection and all other things can added later

manojtm · 31st January 2012, 01:20 PM

Hi All

In my schematic op-amp shows LM1458 its LM358. If you use LM1458 supply must be +12V & -12V

manojtm · 31st January 2012, 01:33 PM

Everybody says that quality of the Class D amp is depending on freq.
Class D amp will work 60KHz to 500KHz but you should use proper supporting components.
The advantage of increasing freq. reducing the size of filter coil and capacitor

stewin · 2nd February 2012, 06:18 PM

hi manojtm did you use 500khz with irfp250 at +/-75vlts? did it work and what load did you use 8ohms 4ohms or was it stable at 2ohms ? thanks for sharing.

manojtm · 4th February 2012, 11:00 AM

Hi stewin IRFP250 will not support 500KHz . 250KHz is Max. It will hot.125KHz is normal and stable @2ohm load

If you want to set 500KHz ,use IRFB4227

andrewlebon · 6th February 2012, 01:43 PM

Hello
greetings can any one advice me which is most suitable mosfet for this amp
i am using IRF250 on50 volt dc rails
1 IRFB4103Pbf
2 IRFB 4227BPbf
data sheet of IRFB4103 shows Rds on@10 volts 139Mohm
data sheet of IRFB4227 shows Rds on@10 volts 19.7Mohm
can anyone advice me most suitable mosfet
warm regards
andrew lebon

22nd January 2012, 07:45 PM	#1604
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	That schematic is for low frequencies only..there are so many others you can use..,what is your experience level..have you worked with switching mode power supplies before ?if so there you will be capable to use any schematic not just blindy copy one. Last edited by CPX; 22nd January 2012 at 07:49 PM.

6th February 2012, 01:43 PM	#1610
andrewlebon diyAudio Member Join Date: Feb 2008	MOSFET RECOMENDATIONS Hello greetings can any one advice me which is most suitable mosfet for this amp i am using IRF250 on50 volt dc rails 1 IRFB4103Pbf 2 IRFB 4227BPbf data sheet of IRFB4103 shows Rds on@10 volts 139Mohm data sheet of IRFB4227 shows Rds on@10 volts 19.7Mohm can anyone advice me most suitable mosfet warm regards andrew lebon

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19th January 2012, 04:56 PM	#1601
akraj diyAudio Member Join Date: Nov 2010	hmmm.....I know it is comparatively complex but it includes end to end design; surely this is tested and will be stable. I was searching for sub amp so it will serve my purpose. HOwever, CPX do you have any working amp design? would be greatful if you can share that!

19th January 2012, 07:49 PM	#1602
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	There are a several working designs on this thread..if you want you can choose one..my amplifier also works and i have made lots of tests but i am still working on improuvements so i have no final schematic yet..

22nd January 2012, 04:50 AM	#1603
akraj diyAudio Member Join Date: Nov 2010	Okay CPX, what do you think about the JBL schematic? I will try to draw a PCB if this is praiseworthy

31st January 2012, 01:20 PM	#1606
manojtm diyAudio Member Join Date: Aug 2008	Hi All In my schematic op-amp shows LM1458 its LM358. If you use LM1458 supply must be +12V & -12V

31st January 2012, 01:33 PM	#1607
manojtm diyAudio Member Join Date: Aug 2008	Everybody says that quality of the Class D amp is depending on freq. Class D amp will work 60KHz to 500KHz but you should use proper supporting components. The advantage of increasing freq. reducing the size of filter coil and capacitor

2nd February 2012, 06:18 PM	#1608
stewin diyAudio Member Join Date: Jul 2007	hi manojtm did you use 500khz with irfp250 at +/-75vlts? did it work and what load did you use 8ohms 4ohms or was it stable at 2ohms ? thanks for sharing.

4th February 2012, 11:00 AM	#1609
manojtm diyAudio Member Join Date: Aug 2008	Hi stewin IRFP250 will not support 500KHz . 250KHz is Max. It will hot.125KHz is normal and stable @2ohm load If you want to set 500KHz ,use IRFB4227

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