Quick zener diode improved by NPN BJT emitter follower circuit – 2N3904 bipolar junction transistor

Table of Contents

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.

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Diagram

Simple zener diode power amplified by NPN bipolar junction transistor BJT emitter follower circuit schematic diagram by electronzap electronzapdotcom
Simple zener diode power amplified by NPN bipolar junction transistor BJT emitter follower circuit schematic diagram by electronzap electronzapdotcom

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.

Video

Quick zener diode improved with NPN BJT emitter follower circuit using 2N3904 by electronzap



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