I have been working on a simple LED blinker circuit for some DIY directional signals for my bike. I am no electrical engineer, so it was a fun exercise in basic electronics. I figure I would post my final circuit here for anyone else who might be inclined to try it.
I finally settled on a basic flip flop circuit that is supposed to light two LEDs alternately. It is a simple circuit that requires less than 10 bucks worth of parts from radio shack. The basic circuit is posted below. What I discovered is that if you replace one of the LEDs with a resistor you can control the flash rate. SO make the circuit and swap a resitor for one of the LEDs then you can find a flash rate by simple trial and error with out having to rebuild the circuit, or crazy math. I run mine off of a 6v battery, and the only difference is I used a 10u capacitor instead of 100u and I took out the resistor in front of the single LED so I could make a brighter cluster it all seems to work fine.