jrz126
Active Member
I just want to make sure that I'm correct. When I bought my blue leds, I wasnt given a forward voltage or anything. So I did a few tests to try to figure it out.
I used 3 different leds, with a 1k series resistor. I adjusted the supply voltage until I got the desired currents. Then I measured the voltage drop across the LED. So I'm assuming my Vd is 3.4V~3.5V? also, is it possible that these leds are rated for more than 20mA?
LED 1 5mA- 3.164 10mA- 3.331 15mA- 3.412 20mA- 3.462
LED 2 5mA- 3.221 10mA- 3.364 15mA- 3.444 20mA- 3.488
LED 3 5mA- 3.178 10mA- 3.327 15mA- 3.412 20mA- 3.478
I used 3 different leds, with a 1k series resistor. I adjusted the supply voltage until I got the desired currents. Then I measured the voltage drop across the LED. So I'm assuming my Vd is 3.4V~3.5V? also, is it possible that these leds are rated for more than 20mA?
LED 1 5mA- 3.164 10mA- 3.331 15mA- 3.412 20mA- 3.462
LED 2 5mA- 3.221 10mA- 3.364 15mA- 3.444 20mA- 3.488
LED 3 5mA- 3.178 10mA- 3.327 15mA- 3.412 20mA- 3.478