555 timer monostable mode stays on for 4 seconds then off

[Shahil]

Hi!

I need to programme a 555 timer pulse with intervals of 4 secs. I've already tried connecting a monostable circuit I found on the net with values of a 36K resistor and 100uF capacitor but what's happening is it's going on for 4 seconds then off for the rest!

Here's the circuit that I tried working - anybody got anything better?? please :shy:

http://www.doctronics.co.uk/555.htm#monostable

 

[Cliff_J]

You're looking for multiple pulses like a clock? If so, look further up the page at the astable circuit. A monostable is just that - mono for 1 pulse!

 

[Shahil]

You're looking for multiple pulses like a clock? If so, look further up the page at the astable circuit. A monostable is just that - mono for 1 pulse!

Hmm...I always thought I was dumb...now u've just proved it! Thanks dude - will get back to you later and I'll tell you if it works!

 

[floped perfect]

Hey, If you go onto
"www.crocadile-clips.com" there's pretty good demo's on programming a 555 timer programme in monostable operation. But you have to download the free trial.

 

[Averagesupernova]

I'm pretty sure there is enough talent on this board to tell you everything you want to know about the 555. Just ask.