The NPN BJT emitter follower (common collector) circuit can transfer the voltage of a zener diode (with a 0.6V loss) without stealing hardly any of the current that is needed to build up the voltage across the reverse biased (RB) zener diode.
NPN BJT emitter follower provides the base voltage minus approx. 0.6V to a load.
A RB zener diode in series with a forward biased diode provides the zener voltage plus about 0.6V diode forward voltage.
Affiliate link ad. This kit has lots of 2N3904, zener diodes. It also has many other semiconductors, usually not included in kits, that are the focus of past and future videos.
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