i havnt tried making it yet, ive just simulated it on crocodile technology
i will try this ckt on monday and see if it works
until then i have another problem, i want the alarm to go off when the monostable timer goes off, i could use a NOT gate, but then before the switch is pressed, the o/p from pin 3 is low, therefore the alarm will go off
so in effect, i want the alarm to go off after pin 3 has gone high then low
.....
pin 3 high>pin 3 low>alarm goes off