I just want to apologize in advance because this might be an incredibly dumb question.

I've gone through the PWM circuit designs which I want to use for 2 blue LEDs (3v voltage drop and 100 mA current rating) in series using a 12 volt wall wart. I figured out that I'll need a 62 ohm 1 watt resistor.

I can't figure out the wattage of the other resistors. Is it 1/8 watts? Should I use 1/4 or 1/2? I want to use the PWM circuit for a few other LED projects, so I'd like to know if changing the source voltage and LED parameters will change the wattage required for the other resistors.

 

my bad, I neglected to mention that this is for the PWM circuit using the 555.

 

Where is the circuit or a link to the circuit?

 

oops.

http://www.reuk.co.uk/LED-Dimmer-Circuit.htm

I'm assuming that it's fairly typical because it's similar to the pwm circuits drawn up on this forum.

 

I suggest 1/4W resistors. 12V * 12V / 1KΩ = more than 1/8 Watt.