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 23rd March 2012, 04:02 PM #321 jacco vermeulen   diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao 2.5 __________________ Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
 23rd March 2012, 04:44 PM #322 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders 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? __________________ regards Andrew T. Last edited by AndrewT; 23rd March 2012 at 04:46 PM.
UKToecutter
diyAudio Member

Join Date: Jan 2010
Location: Harrow, UK
Quote:
 Originally Posted by AndrewT I do not know what 2.5 means in Jacco's post. Does anyone else besides Jacco?
:-)

 23rd March 2012, 05:28 PM #324 Horio   diyAudio Member     Join Date: Mar 2010 Location: Seattle 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 05:37 PM.
 23rd March 2012, 06:21 PM #325 jacco vermeulen   diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao What to say, i'm having a two and a half day. __________________ Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
 23rd March 2012, 10:05 PM #326 buzzforb   diyAudio Member     Join Date: Oct 2010 Location: Burlington, NC 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. __________________ ...Shape the sound , Man!
Zen Mod
Official Court Jester
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Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
 Originally Posted by buzzforb .......
nope
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 23rd March 2012, 10:36 PM #328 buzzforb   diyAudio Member     Join Date: Oct 2010 Location: Burlington, NC 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. __________________ ...Shape the sound , Man!
 23rd March 2012, 10:40 PM #329 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain either post link to exact pdf or post page/screenshot here __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 23rd March 2012, 11:13 PM #330 buzzforb   diyAudio Member     Join Date: Oct 2010 Location: Burlington, NC 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. __________________ ...Shape the sound , Man!

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