led switch

[jrplane]

I need a switch or relay , Something to automatical switch two led circuts from one to the other. I have tow different color on the plane and I would like to see it switch back and forth, maybe every second or so

[rick.benjamin]

How about a blinkie?
http://www.doctronics.co.uk/blinkie.htm

[Miami Mike]

Here's another idea. This "timer tester" is supposed to work with as little as 4.5 volts:

http://www.uoguelph.ca/~antoon/gadgets/555/555.html

http://www.uoguelph.ca/~antoon/circ/555test.gif

For more of these 555 timer circuits, try this Google search (http://www.google.com/search?source=ig&hl=en&rlz=&=&q=555+timer&btnG=Google+Search).