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

Table of Contents

Zener diodes build up a voltage across them pretty nicely, but a parallel load can easily throw off the voltage for a number of reasons, plus there’s other complications. An NPN emitter follower circuit can simply look at that voltage, and provide the power needed to hold that voltage (minus 0.6V) across a widely varying load.

Brief circuit schematics with short video – List of pages
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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

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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