This was a simple power failure alarm circuit and it can be widely used where indication during power failure was required. Most of the power supply failure alarm circuits requires a individual power supply for themselves in order to make…
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This is a ultra sensitive intruder alarm circuit diagram. Here the shadow of the intruder passing through few meters nearby can trigger this circuit to produce an alarm.Here the job is performed by means of a LDR(Light Dependent Resistor).Thus this…
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Police Siren circuit using 555 Timer is the one we are about to see here. This circuit uses two NE 555 ICs and each of them wired as astable multivibrators. And a speaker is used in order to produce the…
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We have seen many alarm circuits but Fire alarm was one of the most important among all. In many buildings,industries and houses fire alarm circuit have been installed in order to alert people them in case of a fire break…
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Burglar alarm circuit or Theft alarm circuits are quite common and different circuits uses different methods to detect intruders. The above circuit uses timer IC 555 to detect and sound alarm upon detecting intruders. The circuit is very easy to…
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