by Dippel43 » Mon Jan 27, 2014 10:36 pm
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.
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- circuit diagram
- caralarm.jpg (87.92 KiB) Viewed 5255 times