pass-d : zen using a switched constant current source

chriscam · 10:42 AM

hi there,

While enjoying The Zen Variations - Part 2 I stumbled into the paragraph where Papa says :

The current source can be made as simple as a resistor (or a light bulb), but it is generally advantageous to make it out of something more complex, since using a resistor results in about 8% efficiency or so, and this being power circuit, wasting this much power gets costly and is socially incorrect.

Since about half the output power gets dissipated in the constant current source I wonder if it makes sense to replace it with a - preferably resonant - bucket switcher ?

Searching this forum for switched current source gave no joy which makes me wonder, could this work or does it just sound so horrible no one even bothered to give it a try ?

StevenOH · 14th June 2010, 01:25 PM

Switching current source for Class A?

chriscam · 14th June 2010, 01:46 PM

ahhh, got it, thanks for pointing !

14th June 2010, 10:32 AM	#1
chriscam diyAudio Member Join Date: Jul 2003 Location: Amsterdam	pass-d : zen using a switched constant current source hi there, While enjoying The Zen Variations - Part 2 I stumbled into the paragraph where Papa says : The current source can be made as simple as a resistor (or a light bulb), but it is generally advantageous to make it out of something more complex, since using a resistor results in about 8% efficiency or so, and this being power circuit, wasting this much power gets costly and is socially incorrect. Since about half the output power gets dissipated in the constant current source I wonder if it makes sense to replace it with a - preferably resonant - bucket switcher ? Searching this forum for switched current source gave no joy which makes me wonder, could this work or does it just sound so horrible no one even bothered to give it a try ? __________________ We should no more let numbers define audio quality than we would let chemical analysis be the arbiter of fine wines. Last edited by chriscam; 14th June 2010 at 10:42 AM.

14th June 2010, 01:25 PM	#2
StevenOH diyAudio Member Join Date: Jun 2004 Location: USA	Switching current source for Class A? __________________ The truth is out there. Who can handle the truth?

14th June 2010, 01:46 PM	#3
chriscam diyAudio Member Join Date: Jul 2003 Location: Amsterdam	ahhh, got it, thanks for pointing ! __________________ We should no more let numbers define audio quality than we would let chemical analysis be the arbiter of fine wines.

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