Opto-Coupler Resistor Value


Author Message
Tinine
Guru

Joined: 30/03/2016
Location: United Kingdom
Posts: 1646
Posted: 08:42am 10 May 2022      

What is really required?

I am only driving a Pico's input from an external 24v. CTR is not an issue so I guess that the DS-stated LED If of 10mA is unimportant, correct? Really want to keep the resistor's power-rating to the minimum.  


Craig