Wanco vertical mast arrow board

[frizzen]

I'm using a 555 timer chip in mine. Due to the chip being used to teach electronic theory, there's not a lot of help in figuring timing other than "well here's the formula."

http://houseofjeff.com/555-timer-osc...cy-calculator/

Plug in how you want it to flash, and it suggest components that will get you there.

[Nikaem]

I have 5 of these on trailers made by fisher price go them for about a dollar each at the thrift store