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4 i n 1 burglar alarm circuit diagram under Repository-circuits -41201- : Next.gr
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![Circuit diagram of the sound alarm unit [1] | Download Scientific Diagram](https://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")
Circuit diagram of the sound alarm unit [1] | Download Scientific Diagram
Fire Alarm Circuit Using IC 555 Timer & Thermistor
Simple Light Detector Alarm with solar sensor | Elec Circuit.com
Timer with Alarm Circuit
