Lets get right to it:
Each of the steps do the same thing. Step 1 is the simplest and we go downhill from there.
No mater what way you choose you must first know these three things:
- Supply voltage This is how much power you're putting into the circuit. Batteries and wall warts will have the output voltage printed on them somewhere. If you're using multiple batteries*, add the voltage together.
- LED Voltage Sometimes "Forward Voltage" but usually just abbreviated "V".
- LED Current Sometimes "Forward Current". This is listed in milliamps or "mA".
Red LED: 2V 15mA
Green LED: 2.1V 20mA
Blue LED: 3.2V 25mA
While LED: 3.2V 25mA
Okay, lets get started!
* Batteries in series.
Introduction photo credits:
LED photo by Luisanto.
Resistor photo by oskay.