how do you convert 9V to 3.6V

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
LED Equation

The LED equation is here.

Just use 1 resistor in series, use the formula.

For a typical amber LED Vf is about 2V, and If is about 20mA. So for 9V I get 350 ohms. To be safe, I'd use 500 or 1K. They get pretty bright even without using them to their max specs.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.