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Old 16th December 2010, 03:57 PM   #1
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Default Need scheme for 400w mosfet amplifier

Hi buddies Im from macedonia and im new on this forum If i do something wrong please tell me on time And of course i need scheme for 400w mosfet amplifier ...
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Old 2nd January 2011, 09:13 AM   #2
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Originally Posted by DANIEL SPASOVSKI View Post
Hi buddies Im from macedonia and im new on this forum If i do something wrong please tell me on time And of course i need scheme for 400w mosfet amplifier ...
Does Somebody have it ?? With pcb ?
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Old 2nd January 2011, 09:37 AM   #3
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Take a look here :::Borina Amaterska Svastara::: the Legend stage master is a good one.
I also have one but send me private mail for that
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Last edited by meanman1964; 2nd January 2011 at 09:41 AM.
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Old 2nd January 2011, 09:44 AM   #4
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Here is the layout
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Old 2nd January 2011, 10:29 AM   #5
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Here is a popular schematic with complementary power transistors.
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Old 2nd January 2011, 10:53 AM   #6
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Also very nice
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Old 10th January 2011, 04:07 PM   #7
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Also very nice
Thanks to two colleagues but i realise that scheme from meanman1964 is better and much easier ... But can somebody tell me 3 things ???
1. Does this scheme surely works ?
2. What transformer i need to get the full power from this amplifier ?
3. How much maximum real power can i get from this amplifier (RMS) ?

Last edited by DANIEL SPASOVSKI; 10th January 2011 at 04:17 PM.
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Old 10th January 2011, 04:28 PM   #8
jaycee is offline jaycee  United Kingdom
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It will provide your 400W RMS into 8 ohms but you will need a lot of FETs and a LARGE heatsink - it will get HOT.

For 95V supplies you would need a transformer with 70V AC secondaries.. it would have to be large, 1000VA at least. You would need a lot of power supply capacitance also.

These amps are not simple, cheap or safe to DIY - you really must know what you are doing - the power supply voltages alone can kill you
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Old 10th January 2011, 04:29 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by DANIEL SPASOVSKI View Post
2. What transformer i need to get the full power from this amplifier ?
3. How much maximum real power can i get from this amplifier (RMS) ?
If you don't know how to arrive at these answers then I suggest this is not a project for you at your current level of expertise.
__________________
regards Andrew T.
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Old 10th January 2011, 04:42 PM   #10
jaycee is offline jaycee  United Kingdom
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If you don't know how to arrive at these answers then I suggest this is not a project for you at your current level of expertise.
Agreed. Class AB is not really suitable for these power levels anyway. Class G/H is not simple to build either. If you really require this sort of power level, you are far better buying a commercially made amplifier. If you buy a second hand one in good working order, it will be cheaper than anything you can DIY.
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