FREQOUT - PWM question

[Etcho]

What's the forward voltage drop of the IR LEDs? If it's less than 2.5v each, yes, you can drive 2 in series. If it's less than 1.6v, you can drive 3 in series. However, total output will probably drop a bit. You might want to drive the gate of a MOSFET which in turn will drive the IR LEDs.

Well here is the data sheet to the LEDs-

http://www.jameco.com/Jameco/Products/ProdDS/106526.pdf

It says the forward voltage drop is usually 1.2V so I should be able to drive two in series along with a 150 or 200 Ohm resistor right?

I just may not get a real far detection range.

Thanks again for the help

[skimask]

Well here is the data sheet to the LEDs-

http://www.jameco.com/Jameco/Products/ProdDS/106526.pdf

It says the forward voltage drop is usually 1.2V so I should be able to drive two in series along with a 150 or 200 Ohm resistor right?

I just may not get a real far detection range.

Thanks again for the help

Sounds like it's easily done, should be able to drive 3 or 4 in series without a problem. I think you're main problem will be ambient light and how to filter that out without killing your detection light.

[Etcho]

Thanks again for all the help, the parts will get to my house next week - I will let you know how it goes.