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Old 26th May 2012, 04:08 PM   #11
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With those kinda powers in mind, i suggest you buy a PA amplifier from somewhere like behringer, labgruppen, qsc, crown, etc.
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Old 30th May 2012, 03:42 PM   #12
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hi hi , thanks you so much for good idea . But i wanna try , i wanna DIY , because i love DIY , so so much
I 've was DIY some project , Naim clone , Leach All in One , some MOSFET , some Transistor ... and more , and i wanna try this project , Nmos power amp , because i'm not yet know it .
And now , first i 'll try this schematic , to get more experience with Nmos Power , i 've was Layout this circuit , and i 'll test it soon .
(sorry for my English)

Thanks Tekko so much
Thanks All

___________
regards
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File Type: jpg Nnmos350-500schematic.jpg (121.7 KB, 186 views)
File Type: jpg Nmos 350W PCB TOP.JPG (827.5 KB, 186 views)
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Old 30th May 2012, 03:47 PM   #13
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with that PCB , the T8 will connect to the main heatsink with 3 wires .
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Old 31st May 2012, 03:50 AM   #14
masood is offline masood  India
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Quote:
Originally Posted by thienchay View Post
thanks dungdochi1987 and Ian Finch
i'm have a Quasi 's design power amp , about 600W .
Please help me , this circuit is reliable and safe ? , if i used 12 x IRFP450 , and +/- 90VDC , i would have how much Watt Output ?
And help me a protect circuit in output stage , first is protect power amp , and if my amp damaged , protect the speaker .
Thanks so much .

thienchay

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dear sir,
would you share its pcb?
thanks masood
my e mail is khan.shahid251@gmail.com

Last edited by masood; 31st May 2012 at 03:58 AM.
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Old 31st May 2012, 04:06 AM   #15
CBS240 is offline CBS240  United States
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VR2 has the wiper connected to the base. Unlike in a simulation, what would happen if the wiper point contact became dirty or loose, turning off completely T8? (hint=> )

Vbe multiplier bias should be re-configured. Also the temperature co-efficient of a B-E junction is not nearly the same as the temp-co of G-S in the mosfets. A Vgs multiplier with a mosfet as thermal compensation would be more appropriate.
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Old 31st May 2012, 12:03 PM   #16
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Quote:
Originally Posted by masood View Post
dear sir,
would you share its pcb?
thanks masood
my e mail is khan.shahid251@gmail.com
yeah , thanks for interest .
I'm do it by Sprint - Layout 5.0 , so i just have file " .mdi"
I don't know how to export to PDF file .
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File Type: zip Quasi Nmos Power Amp.zip (60.5 KB, 89 views)
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Old 31st May 2012, 12:09 PM   #17
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Quote:
Originally Posted by CBS240 View Post
VR2 has the wiper connected to the base. Unlike in a simulation, what would happen if the wiper point contact became dirty or loose, turning off completely T8? (hint=> )

Vbe multiplier bias should be re-configured. Also the temperature co-efficient of a B-E junction is not nearly the same as the temp-co of G-S in the mosfets. A Vgs multiplier with a mosfet as thermal compensation would be more appropriate.
Thanks you so much .
So can you help me modify it to safety more .
Thanks you
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Old 31st May 2012, 01:07 PM   #18
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Hello .
I 've modified it into like this , please see help me it OK or Bad ? can i do like this ? . I need the safety for my Amp
Thanks
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File Type: jpg Nnmos350-500schematic.jpg (125.7 KB, 139 views)
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Old 31st May 2012, 07:05 PM   #19
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dear!
almost of amp is working in oder because they've already build it up.
you should read all details of amp which is explained ( search The Leach amp 200W amplifier, read all amps in audio denmark ) .and then you can MOD by yourself.
you want high power, no need more voltage ~90V dangergous -shock but you can try with BTL circuit .it will enought for you .Neighbour will complain to you ( I've already hear with my neighbour-seem no good,..then. i sold it ).
all circuit protection will working before speaker burn and if you want more safety better never turn it on.
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