Im trying to design a circuit that will delay the turning on of a light.
I have three bulbs, one should turn on as soon as power is applied, the next should turn on in X amount of time after the first, and the final light should turn on in X amount of time after the second.
Basically like this
[on][off][off]
[on][on][off]
[on][on][on]

I believe ther center circuit in the picture im attaching is what i need to use and i picked one up from radio shack but i dont have some of the other parts i would need (all i have are some various resistors and capacitors and other odds and ends from my circuits class)

So what would you guys reommend doing? I cant seem to find a formula to calculate the proper values of the resistors and capacitors so that the time X will be the value i need it to be.


Here is what im trying to accomplish


This post was edited by AXIS on Feb 19 2011 06:48pm

Holy. Shit.

Birthday: Dec 27 1995

.....
ISO someone who knows something about EE, not kids in high school for the most part

Well, I know the time constant Tau = R * C, and that the time constant is the amount of time a capacitor takes to get to ~2/3 of its maximum charge (and therefore 2/3 of its max V), so if you choose RC such that 2 * R * C = the delay time you need, that'll probably be enough to trigger the relay at the appropriate times.

Though I will say, I've never liked or been very good with analog circuitry

I dont know much about it either. I have a 3 hour circuits lab each week were we put together analog circuits and do various calculations with formulas but they are all predesigned and were just assembling them on a bread board.

damn

can you try to explain a little better how you want the delay to work? etc light going from weak to stronger in x time when u press "on" or it goes on after x time after u press "on"?

both of them are kinda easy though, but i dont bother spending to much time, if i miss understood the question.