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Old 19th August 2005, 12:10 AM   #11
forr is offline forr  France
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Hi Jorge,


S. Chekcheyev (from Tirapsol in Moldavia) in his circuit idea of Electronics World, July 2003, p 33, gives the following results with a load of four BC547A connected as diodes :
input 1 mV 0.00062%
input 10 mV 0.0056%
He says the circuit is insensible to variations of supply or temperature.
I've never heard any of the lovers of negative-feedback-less circuits saying he has tried it.


An other very linear and very simple circuit published in EDN Ideas by the same author :
http://www.edn.com/contents/images/91604di.pdf


An third circuit idea from Checkcheyev was pubished in Electronics World in decembre 2004. It's a zero resistance analogue of a zener.
Very simple, too.


~~~~~~~ Forr


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Old 19th August 2005, 02:14 AM   #12
Jorge is offline Jorge  Brazil
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Quote:
Originally posted by forr

An other very linear and very simple circuit published in EDN Ideas by the same author :
http://www.edn.com/contents/images/91604di.pdf

~~~~~~~ Forr



That's a most unusual idea - the two caps 'invert' the diode for AC currents!

And I'm glad to know the distortion of a real life circuit compares quite well with the simulations above!

Merci,

Jorge
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