I was recently advised that instead of buying a regulated wall wart I could try to make my own voltage regulator so I figured why not.
I was told I could use the LM317 for this task, I looked up the datasheet and it has a typical use section. It said I could control the output voltage with the use of two resistors. My question is: What is the formula used to know exactly what resistance you need both resistors to get an output voltage?
Also, what is the resistor symbol with an arrow through it?
I was told I could use the LM317 for this task, I looked up the datasheet and it has a typical use section. It said I could control the output voltage with the use of two resistors. My question is: What is the formula used to know exactly what resistance you need both resistors to get an output voltage?
Also, what is the resistor symbol with an arrow through it?