Newb Question

[shotgunlebowski]

So I am working on lighting the 1/72 y-wing cockpit. I bought some LED's that rotate between Red, Green, and Blue color every 4 seconds. What I want to do is delay one of them from startings say 2 seconds.

What's the best way to go about it. If it makes any difference to your help. I am also using

1 9V battery
2 Red Led's in Parralel with a 470 OHM Resistor each


Hope to keep it all on one circuit.


Thanks

John [/list]

[Umi_Ryuzuki]

Put a small capacitor in the second circuit, it will take a
moment for the capacitor to charge, and that should delay
your second LED start up.

Can't tell you what size capacitor though...

[en'til Zog]

You might try putting a 'large' value cap in PARALLEL with one of the color change LEDs and see if that delays it's start-up. Like 3300 uF at 35 Volts or so. Generally, the bigger the cap, the longer it takes to charge ( stealing voltage from the LED ) so the longer it takes the LED to start blinking.

This is where an experimenter's block (bread board) comes in handy for easily building circuits and seeing what actually happens.