A dual tandem flashing light circuit powered by a 9 volt battery,
This circuit is powered by a 9 volt battery, suitable for warning lights
on a tall structure. (Personally, I can't recommend you buy anything but
the Rollins Railroad Designs kit; for $4.00 you can't go wrong. The
555 IC is about $1.50 by itself at Radio Shack). If you choose to
buy all the parts yourself, realize you need ONLY two LEDs, not two of each;
you should be able to mix and match colors.
