| an old bag of leds |
by thetree |
2006-06-17 14:12:07 |
...
I am holding one in my hand
probably about 50 LEDs
so I plug a yellow one into the breadboard
1.5v battery, 470 ohm reistor
connect, nothing happens..
I thin: maybe the thing is dead, it is about 30 years old, after all.
I take a red one, plug it in
voila
it shines
I take a green one...
conenct it...
it doesnt work..
I try others in the bag
only the red ones work!
AHHH!!!!!!
do yellow and green ones need a different amount of power, and since when? |
|
[ Reply ] |
|
They're all chocolate inside. | by rorajoey | 2006-06-17 14:13:36 |
|
oops, one melted! (n/t) | by thetree | 2006-06-17 14:14:22 |
|
Did you put it in your mouth by mistake? :) (n/t) | by NDwight | 2006-06-17 14:19:22 |
|
it looked so tasty... | by thetree | 2006-06-17 14:30:34 |
|
Maybe. They're only getting around 3 mA | by kahuana | 2006-06-17 14:20:43 |
|
50 ohm reistor- red: lights up green and yellow: | by thetree | 2006-06-17 14:29:47 |
|
Tried both ways? (yah yah, but I have to ask :-) (n/t) | by kahuana | 2006-06-17 14:30:56 |
|
Why do you care? | by RetiQlum2 | 2006-06-17 14:33:00 |
|
Aside from the geek quotient of course. (n/t) | by RetiQlum2 | 2006-06-17 14:33:21 |
|
I hear the old LEDs give off harmful Q radiation | by kahuana | 2006-06-17 14:35:28 |
|
Better than giving of Zeta rays. (n/t) | by RetiQlum2 | 2006-06-17 14:36:38 |
|
Yellow LEDs need about 2V | by Tomo | 2006-11-19 12:55:59 |
|
thanks! :) | by thetree | 2006-06-17 14:45:54 |
|
And if you apply 9VDC. . . | by hieraco | 2006-06-17 14:49:59 |
|
What, no Crackle? (n/t) | by Tomo | 2006-06-17 14:54:09 |
|
It's Electronics, not breakfast! | by hieraco | 2006-06-17 14:56:58 |
|
Only if you don't have a resistor in there... (n/t) | by bwkaz | 2006-06-17 14:56:51 |
|
I can quite happily run many on 12VDC | by fudje | 2006-06-17 17:32:42 |
|
What did you expect with 1.5V? | by Sharku | 2006-06-17 14:40:12 |
|
Green takes around 2 volts | by jayfarm | 2006-06-17 14:46:15 |
