Alarm Circuit Designs
I need a circuit design for a timer that runs on 110vac for 15 minutes and alarms when finished.?
This timer should start when switched on and alarm horn should stop when turned off. I will be hooking up it up to a PA speaker.
Here are a few suggestions
http://images.google.ca/images?hl=en&source=hp&q=timer+circuit+diagram&gbv=2&aq=1&oq=timer+circui
Anita
alarm circuits schematic tutorial الكترونيات
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