Tiny LED Jack-O'-Lantern

Step 4 Circuit Diagram

For those of you who are interested, this is the circuit I designed. It is very simple. Basically, I am providing 3V by using the two AA batteries. The LED is rated at 2.4V and 20mA, so in order to provide the proper current, this is the calculation I did:

• V/I = R
• (3.0 - 2.4) / (0.020) = R
• 30 = R

The closest resistor I had was a 33 ohms, so that's what I used.