I need one help.
IDEA IS: Am having 2 555ic .First ic should work 5 seconds,THEN that output s connected to second ic.That ic is must turn on fan 15 seconds,After 15 seconds fan must be OFF.Suggest me to draw diagram for this concept.

 

http://www.google.co.uk/imgres?q=ne...w=264&start=0&ndsp=20&ved=1t:429,r:8,s:0,i:93


Something like this, alter the resistor capacitor values on pins 6/7 to set the delay