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Old 9th September 2008, 05:38 PM   #1
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Default 10-20 Watts Super Single Ended Class A

hi..i built some single ended designs.i made this circuit and i can say its the best i have heard.and i have some questions...

1-)how we decide the max or best voltage supply value of single ended symmetrical class a amps?(for this amp with irfp240 transistors)

2-)i replaced irfp240 instead of irfp 150 in this circuit.mids and trebles increased and bass reduced..but i always see positive offset of 150mv..i can reduce it to 100mv only by playing trimpots..i can not reduce it anymore..which values of resistors should i change?

3-)what is the technical criterias of sound quality for transistors?
is it low input capacitance?or low Qg?
thanks

best regards
umit
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Old 9th September 2008, 08:52 PM   #2
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is there anybody here?thanks
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Old 9th September 2008, 09:14 PM   #3
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Quote:
Originally posted by umut1001
is there anybody here?thanks
You don't want me to comment a diffpair...
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Old 9th September 2008, 09:27 PM   #4
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i didnt understand..everyone can comment..here is another one..its 32watts rms..has lower distortion..someone says its one of the best
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Old 9th September 2008, 09:39 PM   #5
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Default Adjusting R4 value you may reduce your off set to zero


try a combination... a fixed resistance plus a trimpot...then adjust and measure your offset.

regards,

Carlos
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Old 9th September 2008, 10:03 PM   #6
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thanks i will try..i should change some resistors..there is sth wrong at this amp..
what about the 1. and 3 questions?
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Old 10th September 2008, 10:10 AM   #7
AndrewT is offline AndrewT  Scotland
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for irfp240 the maximum supply voltage is 240Vdc.
The ideal voltage will probably be less than this maximum.
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Old 10th September 2008, 10:16 AM   #8
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hi andrew...there is not a single ended transistor amp works at 200v dc.i meant what is the max voltage value for se class a amps for only one pair of irfp240.whatever.and what about the question 3 ? thanks
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Old 10th September 2008, 11:02 AM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by umut1001
...there is not a single ended transistor amp works at 200v dc.i meant what is the max voltage value for se class a amps for only one pair of irfp240....
I bet there is more than one.
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Old 10th September 2008, 11:06 AM   #10
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i dont understand
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