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Old 23rd March 2012, 05:02 PM   #321
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2.5
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Old 23rd March 2012, 05:44 PM   #322
AndrewT is offline AndrewT  Scotland
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read the balanced/bridged rule again.
Read what you wrote.

BTW,
your 50w peak?? is into what impedance?

I'll guess you used P= Ipk^2 * Rload / 2 to get that. But forgot the / by 2 factor.
Ibias = 3.6Adc
Imax ClassA ~<7.2Apk
P ClassA = 7.1^2 ^ 2 / 2 = 50W into 2r0.

Double (for balanced/bridged) that to get the maximum ClassA into 4r0, i.e. 50W of ClassA into 4r0 from the balanced amplifier.

I do not know what 2.5 means in Jacco's post. Does anyone else besides Jacco?
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Old 23rd March 2012, 05:50 PM   #323
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I do not know what 2.5 means in Jacco's post. Does anyone else besides Jacco?
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Old 23rd March 2012, 06:28 PM   #324
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I am shooting for 50W into 4 ohms per post #315.

Your math is just not making sense to me Andrew. You stated that you want to shoot for 25W into 2r0 per half of a bridged/balanced amp so:

Ibias = 2.5A
Imax Class A ~< 5 Apk
P ClassA = 5.0^2 x 2/2 = 25W into 2r0 (for one side of the balanced amp)

Doubling that gives you 50W Class A into 4r0 for a balanced/bridged amp (double the power into double the impedance). I think an Ibias = 2.5A is the "2.5" Jacco was referring to.

Last edited by Horio; 23rd March 2012 at 06:37 PM.
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Old 23rd March 2012, 07:21 PM   #325
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What to say, i'm having a two and a half day.
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Old 23rd March 2012, 11:05 PM   #326
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For those folks who might have been following earlier discourse about effects of diode in parallel with Rs, should look at internal diagrams Mosfet that come on many datasheets. Picturing internal diagram with diode on source leg gives a nice visual picture of Jacco's comments. Just for the noobs, of course.
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Old 23rd March 2012, 11:09 PM   #327
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.......
nope
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Old 23rd March 2012, 11:36 PM   #328
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Probably wrong, of course, but i was taking about that diagram with the addition of an external diode representing added diode in F5. Is this not what Jacco was trying to illustrate.
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Old 23rd March 2012, 11:40 PM   #329
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either post link to exact pdf or post page/screenshot here
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Old 24th March 2012, 12:13 AM   #330
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Nevermind. I am officially banning myself from posting on anything other than my own projects. Doing a disservice to anyone trying to learn. Thinking about it more, still don't understand. not completely that is.
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