- #1
ebunnyboy
- 3
- 0
hi , every body here , I really seek a help , I have an Ir led from thorlaps it's wave length 1450 nm , I followed the specs
Forward voltage at 20mA is = 1.2 v typical , 1.5 v Max
Max DC forward current = 100mA
Power dissipation is 120 mW
I tried the following resistance 200 ,220 ,190,180 ,100 ,63 ohms the led doesn't work , i thought it was damaged i replaced it with another one same happens but when replaced it
with 940 nm (have almost same specs ) it works
so what's the problem
here is the data sheet
http://www.thorlabs.com/thorProduct.cfm?partNumber=LED1450E
I noticed strange things when tring connecting 180 , 190 , 200 , 220 ohms the led have same voltage drop = 0.85 i keep lowering the resistance values until reached to 63 ohms then it gives 0.95 v and the led doesn't work under camera focus so what i shall do thanks
Forward voltage at 20mA is = 1.2 v typical , 1.5 v Max
Max DC forward current = 100mA
Power dissipation is 120 mW
I tried the following resistance 200 ,220 ,190,180 ,100 ,63 ohms the led doesn't work , i thought it was damaged i replaced it with another one same happens but when replaced it
with 940 nm (have almost same specs ) it works
so what's the problem
here is the data sheet
http://www.thorlabs.com/thorProduct.cfm?partNumber=LED1450E
I noticed strange things when tring connecting 180 , 190 , 200 , 220 ohms the led have same voltage drop = 0.85 i keep lowering the resistance values until reached to 63 ohms then it gives 0.95 v and the led doesn't work under camera focus so what i shall do thanks