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fire alarm circuit | fire alarm » Freak Engineer
![Circuit diagram of the sound alarm unit [1] | Download Scientific Diagram](https://i2.wp.com/www.researchgate.net/publication/338658395/figure/fig5/AS:848381547122690@1579281331288/Circuit-diagram-of-the-sound-alarm-unit-1.jpg)
Circuit diagram of the sound alarm unit [1] | Download Scientific Diagram

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