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How could I go about building a circuit that can do this?
All right, so I plan to build an LED lightsaber made from just bout 6 strings of 10 LEDs in parallel, stacked one on top of the other. When I hit a push-button latching switch, I'd like each of these strings to light up from the bottom to the top, then turn off from top to bottom when the switch is turned off. I've been told that this can be done with a bunch of transistors and capacitors.
The strings will light up and power down in equal, regularly spaced intervals, giving the impression that the blade's beam is springing or retracting into the hilt. A "scrolling effect", if you will.
the transistor and capacitor sting is the best solution. there is a configuration that is a little simpler but it would take the same nuber of components and alot more math. this is just an LED in parellel with an RC timer. doing it this way asures that one led must come on before tne next. the time between lights will be aprox R*C. leave the transitor off on the last LED. the resistor in series with the LED must be present. use about a 3.3k ohm resitor to start with. adust up or down for briteness. you will want one that barely dims the LED. too bright and you will damage the transitor and the LED. too dim and it would not be fun. this will alow you to use the cheapest smallest transitor.
see if this link works:
EDIT: darn! that will only work for turning it on... let me think
i cant come up with a dicrest circuit to power up and poer down the LEDs. it can be done, but it gets complicated fast. you will probably need to use digital to simplify it. it would require a minium of a 1-6 demux with input forming logic (state machine). let me think some more.
Elderly Fanfare/Latch Switch
