I'm using a 555 to create a throbbing effect on a LED, like in this project.
Is there a simple way to delay the signal for a second (then third, then forth...) LED to have them fade in and out at different times?
EDIT: I appreciate the workaround suggestions, but I'm really interested in the original question:
Is there a simple way to delay or phase shift the signal?
Even "it's not possible" or "it's very complicated" are good answers.
Ok, so that circuit builds the common 555 square wave oscillator and drives an emitter follower from the capacitor voltage. The emitter follower drives the LED.
To get the multi-stage throbing build first a circuit that produces multiple phase-shifted square waves - for example build a ring counter ans drive the clock input using the 555 - then smooth the edges of the pulses from the ring counter with the resistor-capacitor-transistor combination that the throbbing circuit uses. Use a smaller resistor or capacitor on the 555 as it will need to run faster in this application.
I am not sure if this is what you are trying to do, but take a look at 555 based knight rider circuit or 555 based police lights. I don't know what supplies are available, but to add throbbing to these designs you would need multiple 555s or something smarter I can't think of.
