Source Follower Enlightenment

SteveS · 20th June 2002, 01:58 PM

All,

Would it be OK to use a incandecent light bulb (as in the Zenlightenment amplifier) as a CCS in a source follower configuration? Would it negatively impact the sound? I'm thinking this would be a good way to get around some of the large heatsinking requirements of a Class-A setup.

Thanks,
zagnar

nar · 20th June 2002, 02:44 PM

Should be no problem as long as the voltage drop across the bulb is high enough to simulate a real CCS.

Some people here in the forum say that a resistor load always sound better than a real constant current source...

...but in all Alephs the current sources are there,so ...

I'm perplex.What does Nelson state for this crucial point?...

Nelson Pass · 20th June 2002, 07:35 PM

The bulbs work just great. Their impedances are fairly
high compared to speakers, and so they don't really
load down the output much at all. See the article for
the appropriate kinds of values and voltages.

SteveS · 20th June 2002, 10:58 PM

Will do!

Thanks nar and Mr. Pass.

zagnar

20th June 2002, 01:58 PM	#1
SteveS diyAudio Member Join Date: Feb 2002 Location: Bedford, TX	Source Follower Enlightenment All, Would it be OK to use a incandecent light bulb (as in the Zenlightenment amplifier) as a CCS in a source follower configuration? Would it negatively impact the sound? I'm thinking this would be a good way to get around some of the large heatsinking requirements of a Class-A setup. Thanks, zagnar

20th June 2002, 02:44 PM	#2
nar diyAudio Member Join Date: Apr 2002 Location: near the sea	Should be no problem as long as the voltage drop across the bulb is high enough to simulate a real CCS. Some people here in the forum say that a resistor load always sound better than a real constant current source... ...but in all Alephs the current sources are there,so ... I'm perplex.What does Nelson state for this crucial point?... __________________ "... Audio needs the thinnest wire ..." Rowan McCombe "Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright

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20th June 2002, 07:35 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	The bulbs work just great. Their impedances are fairly high compared to speakers, and so they don't really load down the output much at all. See the article for the appropriate kinds of values and voltages.

20th June 2002, 10:58 PM	#4
SteveS diyAudio Member Join Date: Feb 2002 Location: Bedford, TX	Will do! Thanks nar and Mr. Pass. zagnar

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