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Old 20th August 2004, 09:11 AM   #1
djdamix is offline djdamix  France
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Default toroidal transformer rating

which VA and VAC ratings do you advice me to do 300W @ 8 ohm audio amp ? The first i've made (thanks to this forum) need 2 x 35V to give about 90w @ 4 ohm. What's the formula to get these parameters ???

I think almost all the loss are in the output state (MOS) ??

Thanks
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Old 20th August 2004, 09:15 AM   #2
UrSv is offline UrSv  Sweden
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Too little info. Type of amp (Class A Single-ended, Class A PP, Class AB, Class D etc...). Preferably type/schematic...
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Old 20th August 2004, 09:57 AM   #3
djdamix is offline djdamix  France
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sorry ... it's class AB output stage, IRFP240 (MOS). I have not the schema yiet ...

David
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Old 20th August 2004, 09:59 AM   #4
djdamix is offline djdamix  France
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(and of course IRFP9240 also )....
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Old 20th August 2004, 11:40 AM   #5
sss is offline sss  Israel
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for 300W amp u need about 500VA transformer
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Old 20th August 2004, 12:22 PM   #6
djQUAN is offline djQUAN  Philippines
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Quote:
Originally posted by UrSv
Too little info. Type of amp (Class A Single-ended, Class A PP, Class AB, Class D etc...). Preferably type/schematic...


well, I just thought that class A would be out of the choice. 300W RMS with 20% efficiency?
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Old 20th August 2004, 12:25 PM   #7
djk is offline djk
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60-0-60AC will give 85V no load, 500VA is good for me.
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Old 20th August 2004, 12:32 PM   #8
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by djQUAN


well, I just thought that class A would be out of the choice. 300W RMS with 20% efficiency?
Hey, asuming too much here. He might be using this in his winter cottage in Greenland where he has his own power plant. Besides, the question is hard to answer if no information is at hand....
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Old 20th August 2004, 12:33 PM   #9
MikeW is offline MikeW  United States
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Check out Rod's subwoofer amp.
http://sound.westhost.com/project68.htm
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