I AM JUST DESIGNING A TIMER CIRUIT...
ON TIME=10μs
OFF TIME=1ms

ToN=0.69(R1+R2)*C
ToFF=0.69(R2)*C

PLZ HELP TO DECIDE TO PROPER VALUE OF R1,R2,C

I am waiting for your response..

Thanks
Mohammad Fahim Raja

 

try a10nF cap and a 145K resistor for the 1mSec, then use a 1.5K resistor for the 10uSec, if you use the hysterical osc circuit configuration, that uses pin 3 as the capacitor supply, you will need to put in two diodes in series with your resistors, one in each direction.

http://www.allaboutcircuits.com/vol_6/chpt_8/3.html

 

well..dear....u said right...thanx alot....