@Robotz012248 this is what you said

I'm sorry. I should have given you all the info. I attached 3 pics of the basic set up of Gizmo's head. A project box from Radio Shack; and two flashlights from Harbor Freight. You can see the reflector from one of the flashlights with the alum. tube, which will house the 10 mm blue LED. The 12; 3 mm LEDs will be placed in a circle around the tube; placed in holes drilled in the reflector. The 10 mm LED has a forward voltage of 3.2 to 3.6 volts. The 5mm LED's have a forward voltage of 3.2 to 3.4 volts. All of them are typical 2mA current draw. Using our friend, Ohm's law, is how I determined a resistor value of 15 ohm. The six upper LED's will be on the "on-off " circuit and the lower six on a separate circuit. Does that sound right to you? What I need help with is the make-up of the circuit that will turn the six upper LED's off and on, ( ie...the blink!) I think it would look more human like if the "blinks" happened somewhat ramdomly, say based on every 3 to 10 seconds. Any ideas or suggestions?

you say you want the first 10mm leds to go on -off ,very easy then second circuit you said you need 6 leds blink on-off at 3 to 10 sec very easy all you need is a 555 timer and a mosfet and to strat the time first led come on then off then triggers the 555 timer for 3 -10 seconds orr do you also need the first set of leds to go off-on at a time like 3-10 seconds too still can be done with only one 555 timer now if you need them at different times on-off ,like example one at 3 sec and one at 10 sec vcan use 2 555 times or use one 555 with a timer switch mostly a 555 timer with a extra transistor on the timing circuit and you only need one I/O digital pin

@ Niek : You can contact me at : [email protected] Thanks.