tv b gone transistor help

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exapod
 
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Joined: Tue Jul 12, 2011 1:58 pm

tv b gone transistor help

Post by exapod »

i wanna make a tv-b-gone with 4 of this ir leds : http://docs-europe.electrocomponents.co ... df46d4.pdf
http://docs-europe.electrocomponents.co ... e1b0e6.pdf .
i was thinking of drive them with the same transistor configuration of the ladyada's one at 200 ma but i don't know if it is too much or i can drive them with higher current, also what voltage do you reccomend? the datasheet says from 1.35 to 1.6 when I=100 ma and from 2.6 to 3 when I=1A.
My power supply is a one cell lipo battery of 1000 mAh.

P.S.:Why in the adafruit tv-b-gone the leds doesnt have a current limiting resistor?

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