I am trying to use an LED array to indicate a voltage level. For example, if the voltage is 3V, then 1 LED is lightened up. If 4V, 2 are lightened up. If 5V, 3 are lightened up, etc.. My previous design is to use many simple analog comparators to achieve this.
I now somewhat feel that it is possible to achieve the same effect with some Zener diodes. It would greatly simplify my circuit. How may I do it with Zener diodes?