How to design and build an LED constant current source using a Zener Diode

in this video we look at a Classic Circuit You Should Know - The Zener biased LED driver. Here is a link to the calculator: In this circuit, the base current is fixed by the Zener diode. If the base current is fixed, the emitter current is also fixed. So small changes in supply voltage will have very little effect on the LED. Get 5 boards in about a week for $22! Learnelectronics Merchandise: Yes!! I now have merch: Electronics themed T-Shirts! ---------------------------------------------------------------------------------------------------------------- HEY YOU ABOUT TO POST SOMETHING STUPID: Yes, I know my hands are large/fat. It’s because of a heart condition I suffer from called Congestive Heart Failure. Here’s a link to some information about CHF: One of the symptoms is that it causes fluid retention, mostly in