General purpose circuit of the simple pressure sensor alarm is built around a couple of readily available cheap components. Working of this circuit is straight forward and self-explanatory. When the ...

Cooking is the leading trigger for home fire alarms, yet the device you rely on to protect your family can become so annoying near the kitchen that you are tempted to silence it or take it down. The ...

The Fist Alert SA3210 Dual Sensor Ten Year Alarm makes use of both ionization and photoelectric sensors to offer the earliest possible warning--regardless of the type of fire. While all smoke alarms ...

The idea behind this compact and economical Vibration Sensor Alarm is very simple. It uses a cheap and cheerful vibration sensor to drive a piezo-sounder. As can be seen in the circuit diagram, it is ...

The sound of car alarms going off at the touch are common enough. How do these car protection systems detect intrusion? In a car alarm system, a siren is connected to a few sensors to ensure that as ...