Need scheme for 400w mosfet amplifier

DANIEL SPASOVSKI · 16th December 2010, 02:57 PM

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

...

DANIEL SPASOVSKI · 2nd January 2011, 08:13 AM

Quote:

Originally Posted by DANIEL SPASOVSKI

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 ?

meanman1964 · 08:41 AM

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

meanman1964 · 2nd January 2011, 08:44 AM

Here is the layout

radu8982 · 2nd January 2011, 09:29 AM

Here is a popular schematic with complementary power transistors

.

meanman1964 · 2nd January 2011, 09:53 AM

Also very nice

DANIEL SPASOVSKI · 03:17 PM

Quote:

Originally Posted by meanman1964

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) ?

jaycee · 10th January 2011, 03:28 PM

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

AndrewT · 10th January 2011, 03:29 PM

Quote:

Originally Posted by DANIEL SPASOVSKI

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.

jaycee · 10th January 2011, 03:42 PM

Quote:

Originally Posted by AndrewT

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.

16th December 2010, 02:57 PM	#1
DANIEL SPASOVSKI diyAudio Member Join Date: Jun 2010	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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2nd January 2011, 09:53 AM	#6
meanman1964 diyAudio Member Join Date: Oct 2006 Location: Belgium the land of chocolate	Also very nice

10th January 2011, 03:28 PM	#8
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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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