So you are saying if you have a crap constant current circuit you will get crap results. Doh!That is no reasion to abandon the concept.
A simple MOSFET and resistor provides much better solution than using CC driver in this application.
Quote from: mjkzz on Mar 26, 2013, 10:56 amA simple MOSFET and resistor provides much better solution than using CC driver in this application. No, a mosfet, transistor and a couple of resistors configured as a linear constant current regulator provides a better solution (although if you are running the IR LED from a regulated supply, then a mosfet and series resistor is adequate). But you are correct in that the usual switching regulators are not designed to be modulated at 38kHz.
I was able to set up the circuit with a 2N3904 transistor. I'm using external power. The circuit works, I can see the LED flashing with a digital camera, but the flash is very weak, less than using it directly on Arduino PIN.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16