Im wonding if anyone has a curcuit atored away that might help me. Im looking for a basic circuit that will flash a set of 6 LED’s. I have 4 sets of 6 LED’s and i need 2 of the sets to flash twice and then the other set to flash twice., and alternate back and forth. I would like the flash and switch to be very quick. Let me know what i can do. I have a bunch of 555 times laying around and would love to be able to use those. Thanks!!
I think something like this could work, at least it should set you in the right direction.
Set up the 555 so that its in astable mode (it keeps oscillating), and hook up the output of the 555 to the clock input of a counter. From there your led sets are controlled by the state of the counter and the transistors. D0 controls the flashing and D1 with the help of the inverter (center transistor on the bottom) controls which set of LED’s are active. Note the misconnection by the inverter. Thats what you get for drawing with pen before you think things through…
Ideally you’d have a current limiting resistor for every led, but you can usually get away with one resistor for the whole set.
EDIT: I think it should be D0 for the blinking and D2 for the set select to make it blink twice per set.
EDIT: The only other thing i can think of, is you probably need another inverter between D0 and B1, B2, because you’d need PNP transistors at the top (Q1, Q2, even though the drawing is wrong) which are active low. but other than that, it should work… mebbie. 
