This circuit is a type of alarm system in which different values of resistors are used to adjust the triggering time of its buzzer. The design has fewer components than a conventional timing circuit.

The circuit was designed to produce a circuit that will alarm a sleeping person to prevent snoring by using a vibrator instead of an audio alert so as not to affect the whole household. It contains a ...

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 ...

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 ...