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Old 19th January 2012, 04:56 PM   #1601
akraj is offline akraj  Bangladesh
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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!
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Old 19th January 2012, 07:49 PM   #1602
CPX is offline CPX  Romania
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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..
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Old 22nd January 2012, 04:50 AM   #1603
akraj is offline akraj  Bangladesh
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Okay CPX, what do you think about the JBL schematic? I will try to draw a PCB if this is praiseworthy
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Old 22nd January 2012, 07:45 PM   #1604
CPX is offline CPX  Romania
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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.
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Old 31st January 2012, 12:12 PM   #1605
manojtm is offline manojtm  India
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Hi All

Now I will give my working design!!!!!!!!!!!!!!!
Its simple and good.Protection and all other things can added later
Attached Files
File Type: pdf UCD625.pdf (15.4 KB, 813 views)
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Old 31st January 2012, 01:20 PM   #1606
manojtm is offline manojtm  India
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Hi All

In my schematic op-amp shows LM1458 its LM358. If you use LM1458 supply must be +12V & -12V
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Old 31st January 2012, 01:33 PM   #1607
manojtm is offline manojtm  India
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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
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Old 2nd February 2012, 06:18 PM   #1608
stewin is offline stewin  Kenya
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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.
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Old 4th February 2012, 11:00 AM   #1609
manojtm is offline manojtm  India
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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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Old 6th February 2012, 01:43 PM   #1610
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Default 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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