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555 monostable Operation problem


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Hi guys!

well! im using 555 IC as a monostable multivibrator. What im using values are

R=690kohms
C=10uf

and i have connected trigger pin i.e. pin2 to the ground. Now i think when the circuit will be on, the pin3 should give me a pulse of width around 5-7 sec and then the output on pin3 should become low. BUt here is what im getting:

I get a constant output of around 5V as my Vcc is 5V. and when i connect my trigger pin to Vcc, the output becomes 0, when i connect it to GND, the output becomes 5V. But the thing is that output on pin3 doesnot get low after even a minute. WHat is this problem??

PLease help me as soon as possible!

i shall be thankful to u for this act of kindness!

Good Bye!

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