How to lower the voltage on the cooler from (raspberry pi) from 9V to 5V?

Question

Electronics

Good afternoon.
What resistor can be used to lower the voltage. There is a 9V-0.6Am power supply. and a 5V cooler for RaspberryPi?

Answer 1

To do this, you need to know the operating current of the cooler - it is written on it.
To make everything happen automatically, instead of a resistor, you need to use a 7805 chip