|
Class : Apprenti
Posts : 1
Registered on : 29/08/2008
Off line
|
Hi,
I got 3 of them and 4.5V 500mA power supply.
Do I still need any resistors?
Cheers,
Jakub
|
|
Class : Electronicien en chef
Posts : 651
Registered on : 10/07/2007
Off line
|
Hello Jakub and welcome.
Since it's your First message , i presume you didn't look in the different thread of this forum, so 'ill repeat.
Leds are no light bulbs but diodes, so don't treat them as light bulbs but as diodes.
Thats :
1) Leds are current driven, not voltage driven.
2) NEVER use leds without a resistor
Have a look at the led wizard on the website frontpage, it'll calculate the whole thing for you.
I presume your power supply is a little power adapter, from a phone or misc electronic device. If that's the case : use 'unregulated power supply' as PSU type in the wizard.
cya
|