Sounds good, whatever you think looks closest to a police light bar.

Im not excactly sure what the timing is behind them blinking, but whatever you think is close is fine.

The only part i remember is there is a longer pulse before a couple or few short pulses.

 

Here is an outline of your description for your consideration.A = 555, B-E = 1/4 558 each. If one of our good friends can tell us how to make a toggle in FF from a 556 much appreciated. All timers can be individually set. All suggestion welcomed.

 

Oh man, we are so close! that is even better than what i came up with...i was going to use a flip flop to control the reset pins on 2 timers, but i would get red blinking fast and then blue blinking fast.

This is a lot better, but i dont understand what the toggle thing is about?


I am unfamiliar with a 558, ill look it up...

 

I see, it's like a bunch of 555 one-shots tied in series, with adjustable timing cycles.

1 triggers 2, 2 stays on for (whatever RC you set up) then triggers 3, and so on.

nifty!


hmmmm, im still not seeing the toggle thing...lol

 

The 558 is a little different than 555 in that it uses a negative edge trigger, threshold and discharge are internal, whole package has common reset. The toggle flip-flop alternates the timing chain between red and blue. Are you willing to use 2 IC's?

 

My explanation of "toggle " not so good. " I was going to use a flip-flop " same thing as a toggle input FF, for each clock input FF changes state.

 

Here is the outline with pin numbers. All C's are μF ; C 1= .5 ; C 2, 4, 6 = .1 ; C 3, 5 = .2 ; C 7 = .01 ; D 1,2,3 = 1N914 or equiv. ; A= 555 ; B,C,D,E = 558 ; F = 74C107 ; G= 4081 ; unused pins on F 8,9,10,11 to +V. R 1,3,7 = 1M ; R 5,9,= 470k ; R 12= 47k ;R 4,6,8,10, 11= 4.7k.