Instead of these exotic current limiting diodes, he could have used a current source or current sink consisting of an PNP or NPN transistor respectively, a (zener) diodes, and 2 resistors.

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Zener Diode Tutorial. 22 Comments . by: Al Williams. August 15, 2018. Title: Copy. Short Link: Copy. We always enjoy [w2aew’s] videos, and his latest on zener diodes is no exception.