Now you can build your own simple door alarm security system using a tiny microcontroller chip PIC12F635! The circuit is nothing but an aural alert unit, which raises a warning tone when the concerned ...

Learn how to make a simple door alarm to enhance your home security with our step-by-step guide. This DIY theft alert alarm ...

The receiver is equally simple and also based on a CMOS 555. ... the oscillator built around the 555 is enabled and starts to produce a warning tone. Finally, the test values indicated in the infrared ...

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