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Old 12th January 2005, 05:46 AM   #11
thanh is offline thanh  Viet Nam
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Is output impedance of the 2-transistor version more precise than the 15 zener diode version?
how is noise if i put a 100n cap across by zener diode?
i can't access your site ! Jet!
bye!
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Old 12th January 2005, 08:27 AM   #12
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Quote:
Originally posted by thanh
Is output impedance of the 2-transistor version more precise than the 15 zener diode version?
Good question, can't answer it myself, should take a closer look. I suppose it's larger. I think of an ideal current source if current stays constant no matter what the voltage over it is. I've read, not yet completely figured out why, that the current will be less constant with diodes so I suppose output impedance will be smaller.

Though, not completely sure of this, some smarter guy, or girl, should answer this!
Quote:
Originally posted by thanh

how is noise if i put a 100n cap across by zener diode?
i can't access your site ! Jet!
bye!
This all depends on how large the supply voltage is, the ripple on it and the variation in current. In my case I think it's better to use something in the uF.

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Originally posted by thanh

i can't access your site ! Jet!
I know there are some problems, google left me because of something my provider did, I'm trying to fix that now.
You should be able to acces the site on the following urls:
http://users.telenet.be/jef_patat/ (please use this url if you reference to it)
http://users.pandora.be/jef_patat/
http://jefpatat.freefronthost.com


kind regards, Jef
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Old 18th January 2005, 03:30 PM   #13
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OK,

after a little reseach, simulating and reading some books and websites I got the answer to my question, I'll change it on my site shortly.

The only question that remains is the function of R5. The only reason I can think of is the that it is there for fault detection as I explain on my site.

btw, the site has moved to http://jefpatat.freefronthost.com/au...t%20source.htm
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