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Old 20th February 2011, 05:47 PM   #1081
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Old 20th February 2011, 06:01 PM   #1082
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To go farther than evidence.

Last edited by bobodioulasso; 20th February 2011 at 06:09 PM.
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Old 20th February 2011, 07:29 PM   #1083
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Quote:
Originally Posted by qusp View Post
i guess the language is confusing me, because to me power is an absolute measurement, you can have 4 times the drive, but only because the load is halved, there is not magically 4 times te available power when you have only doubled it. at least if there is there is something i'm missing.
Sorry if someone has already answered this.

P=V^2/r, Therefore if you double the voltage you quadruple the power. I am not sure if that has answered your question.

Also you get less class A current. That is you get half the class A current compared to a regular F5 biased in the same manner.
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Old 20th February 2011, 07:33 PM   #1084
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Quote:
Originally Posted by tinitus View Post
if you want 100% pure classA, it seems to me that both low impedance speakers and balanced design is a bit of a 'pain'
I agree with that, but I would also argue that you don't need 100% pure class A.
If you can bias for 20W to 30W in Class A and the rest coming from class B, then I think most people will be more than satsfied with that.
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Old 20th February 2011, 08:41 PM   #1085
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Originally Posted by bobodioulasso View Post
In order to (try to) be forgiven, i produce this drawing.

When the current in AD branch reaches 2xIbias ( or total bias)
The current into BC branch has decreased to 0A.
This agrees with my simulated results.
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Old 20th February 2011, 09:01 PM   #1086
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You did a nice job.
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Old 20th February 2011, 09:52 PM   #1087
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Quote:
Originally Posted by Melon Head View Post
I agree with that, but I would also argue that you don't need 100% pure class A.
If you can bias for 20W to 30W in Class A and the rest coming from class B, then I think most people will be more than satsfied with that.
ahh, yes
and that we do

but why do I get a reminder of old days when some amps were 'marketed' with their 'music wattage'
hey, Im not trying to be sarchastic, not at all, and I know it may not be quite the same thing
but I still get this..hmmm

but hey, Im doing it too
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Old 20th February 2011, 10:28 PM   #1088
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Just for clarification. If you think you need 100W then use the appropriate rail voltage, but only bias 20W for your known load (eg 5Ohms).
So you have the voltage to drive 100W max and the current to deliver 20W class A.
I am sure everyone can do the maths on that one now.
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Old 20th February 2011, 10:37 PM   #1089
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Old 20th February 2011, 11:54 PM   #1090
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