Let's Make Robots!

IR LED's. blowing out

The 2 diagrams are cicuits for driving led at 38khz. I implemented both circuits. Firstly i take the second cicuit from the link and just add on the transistor part as seen in the first circuit. I did not add the 4.7kohm resistor nor did i add the 47ohm. Is that the reason why six of my leds are blowing out?



the circuit over here http://marwww.in2p3.fr/~levansuu/projets_es2i/Parallax/stamps%20in%20class%20website/downloads/rob4.pdf 

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
By the way, does anyone know how to measure frequency?

Your mulitmeter might have a setting for it. Or you could get/make a simple logic analyzer or frequency counter with a micro.

Just program a micro to count highs on a pin for a certain time period and maybe serial print it or display it on an LCD.

My multimeter doesn't and I don noe how to do it with a micro. D; U noe how to do it with a bs2?