The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special devices and can be built using components that you will no ...

Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This little and flexible circuit consists of a touch ...

We may earn a commission from links on this page. Whether it's paranoia or past experience, protecting your bag from potential thieves isn't a bad idea. It's also a fun DIY project! The folks over at ...

If you could spend a couple of bucks on a simple project that might prevent a $2000 repair bill on your vehicle, you’d probably build it, right? That’s the idea behind this simple low-pressure alarm ...

A few simple components are all it takes to create an over-temperature alarm. The circuit in Figure 1 requires only an ordinary negative-temperature-coefficient (NTC) thermistor, two common ICs, and a ...

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Interest in emergency systems rose sharply after 9/11 and remains high. Building owners no longer install fire alarm signaling systems just to satisfy their insurance company. Today, their motivation ...