Class i and siblings - Page 21

Edmond Stuart · 16th March 2012, 11:49 AM

Hi Keantoken,

I appreciate you have figured this out.
I also share your concern about the quasi-saturation and how well that is modeled.
Vce of Q5 & Q6, for example, is very low. Happily, these trannies have little work to do, as they only provide the bias voltage for the other trannies (Q3, Q4, Q7 & Q8).

BTW, how well matched are those NXP duals? They are not monolithic, is it?

Cheers,
E.

keantoken · 16th March 2012, 07:24 PM

I have not tried the duals, they are not advertised as matched so I can only assume they are like transistors from the same batch. I heard that Phillips BC560C had very good matching straight from the factory, but they no longer make those and Phillips has become NXP.

jan.didden · 3rd October 2012, 10:00 PM

For those (still) interested in class i, Kendall's original Linear Audio article is being published by EDN in their 'analog zone'.

Part I appears here:

Designing a low-distortion audio output stage - Part 1: Introduction, the problem with push-pull outputs | EDN

Enjoy!

jan didden

16th March 2012, 11:49 AM	#201
Edmond Stuart diyAudio Member Join Date: Nov 2003 Location: Amsterdam	Hi Keantoken, I appreciate you have figured this out. I also share your concern about the quasi-saturation and how well that is modeled. Vce of Q5 & Q6, for example, is very low. Happily, these trannies have little work to do, as they only provide the bias voltage for the other trannies (Q3, Q4, Q7 & Q8). BTW, how well matched are those NXP duals? They are not monolithic, is it? Cheers, E. __________________ Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk)

16th March 2012, 07:24 PM	#202
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas Blog Entries: 1	I have not tried the duals, they are not advertised as matched so I can only assume they are like transistors from the same batch. I heard that Phillips BC560C had very good matching straight from the factory, but they no longer make those and Phillips has become NXP. __________________ The Kmultiplier rail filter! LTSpice wiki with special attention to new users' troubles

3rd October 2012, 10:00 PM	#203
jan.didden diyAudio Member Join Date: May 2002 Location: Great City of Turnhout, Belgium Blog Entries: 6	For those (still) interested in class i, Kendall's original Linear Audio article is being published by EDN in their 'analog zone'. Part I appears here: Designing a low-distortion audio output stage - Part 1: Introduction, the problem with push-pull outputs \| EDN Enjoy! jan didden __________________ /Yes! Its out: Linear Audio Vol 5! I'm not an "accademic", just a plodder who loves a challenge - Ian Hegglun

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