i tried to simulate a 555 timer circuit in monostable mode and it didn't seam to work right. the astable version worked very fine but with monostable didn't ever go off it just stayed on. sorry i couldn't get the circuit to post but i went over it again and again the only thing i noticed was that i didn't use a touch switch but a on/off switch which was all i could get using Multisim. so once the switch closed, it stayed down and the output continues constantly past the time and once the switch was opened, the went back to zero. what could the problem be?