plzzz can anyone helps me in that
i want a circuit that it's o/p goes high after about 15 secs using a 555 timer
plz send me the link where i can find the circiut or send me the a mail to tell the solution pllllz
thx

 

Page 7 of this document: http://cache.national.com/ds/LM/LM555.pdf

If something more basic is needed, try this instead: http://www.uoguelph.ca/~antoon/gadgets/555/555.html

Note: you will need to invert the output by using an NPN transistor switch or a 7404 chip.