Hi I want to build a Zener voltage regulator circuit to convert 12V to 5V for my sensor. The sensor is rated for 5V 20mA. I am trying the below circuit, but I dont know how to calculate the Zener resistance value
Here Vin is 12V and Z1 is a 5.1V Zener Diode. Can someone please explain the reason why we need Rs and RL. Becasue I powered the circuit without them and even then I got 5.1V across zener. So why I need them and how to calculate the value this two resistors?
Thanks in advance