I am currently diving in in embedded development using ATMega Microprocessesors. I have now a question regarding Z-Diodes. My circuit is powered by a 9V battery that gets through an IC7805, thus getting a constant 5V power supply. Now I have a part that requires to be used at 3V. I made my thoughts how to achieve that and two things came across my mind: 1. Use an LM1086, which I felt is a but overpowered for just one part needing 3V or use a Z-Diode.
I build a little prototype on my breadboard using the IC7805 as supply and using a 3V Zener Diode to go down to 3V and power a LED with that. It so far works fine, but when I measure the power at the LED, I always only get 2,3V and if i measure the diode, i get 2,7V.
Here is the circuit plan I use:
(I just saw I forgot to add a value to R1, which is 100 Ohms)
Am I really getting just 3V at the diode? If yes, why cant i measure it with my multimeter.
Thanks in advance!