spdt relay useage

[gizmo13]

Hey guys,

I have a circuit that I have built using led's and I have run into a problem.
I have a 555 timer on the circuit which will turn all the led's on a once for
about 5 seconds. After the circuit finishes with this time delay I want it
to switch over to a contoller circuit that will make the led's go through a
chaser sequence.
In "layman's terms" when the power is supplied (12v dc) all the led's will
shine for 5 seconds but after this function is completed I want to use a
spdt relay to "switch" the led's to illuminate in a different fashion.
I know that there are easier ways to do this with pic's but I need to know
how to utilize this with the spdt relay (if that is even necessary).
That's kind of what I need you guys for. I have worked out everything but
this detail. I am a major "ametuer" (sp) hobbyist and know enough to tinker
but I had rememberd someone suggesting using a spdt relay but I forgot
how to wire it in.

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
and THANKS!!!!!!!

 

[kchriste]

There are a couple of ways to do this.
One way involves simply speeding up the sequencer, for 5 seconds, so that all the LEDs appear to be on. It will use fewer parts, but the LEDs will be relatively dim due to the "multiplexing".
Another way involves the use of many diodes. Two diodes per LED. One diode's anode goes to the 5 second timed power and the other diode's anode goes to a + sequencer output. The cathodes are tied together and connected to a LED and it's resistor.