|
![](/i/fill.gif) |
>> Yes, that's the other fun thing. Depending on which type of gates
>> you're using, they supply about 20 mA. But some of the LEDs I'm
>> looking it draw 40 mA...
>
> What you mean is, they draw *up to* 40 mA? How much they actually draw
> depends on what value series resistor you put in there. Using Ohm's law
> and the V-I curve of the LED from the datasheet you can work out exactly
> what resistor size you need for a given current.
See for yourself:
http://www.maplin.co.uk/Module.aspx?ModuleNo=35702
"Forward current: 25 mA"
If you can figure out what the hell that means, be my guest...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
Post a reply to this message
|
![](/i/fill.gif) |