Basic Alarm Circuit

[Dippel43]

I am trying to help a friend build a basic alarm using a diagram he sent me which I believe he found online. It's been awhile since my EE courses in collage but i dusted off the bread board anyway and tried to set it up as shown in the diagram. But something is not correct, it is a simple alarm that is tripped when a ground is broken. Right now, the alarm will go off, but it is supposed to quit after a few moments so as not to drive everyone crazy. I cannot get it to stop unless i reattach the ground. Any ideas? I've attached the schematic to this post.

[pebe]

It appears that T1 stays switched on. I would suspect C1 is connected the wrong way round, or is leaky..

[colin55]

Try 1M between base of first transistor and ground