What ready made timing circuit can I use to power some strobes for say 4 secs then

[DaveyWelshWoo]

a random interval then 4sec? It is for a display so i need power for just a few seconds then off for a random interval max 5 mins then on for another few seconds constantly. I have looked everywhere

 

[flubster666]

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