Burglar Alarm Circuit Using Lm358

In this laser security alarm circuit we have used lm358 dual comparator ic for comparing voltages coming from ldr. For the indication we have included both buzzer led. First connect the 10 kω potentiometer to the inverting terminal of the lm358 op amp.

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Now if we connect it to the alarm circuit is noisy.

Burglar alarm circuit using lm358. The voltage at c4 is connected to pin 10 of ic 1 3 lower than pin 9 makes pin 8 no voltage out. The design of the fire alarm circuit with siren sound is very simple. A burglar alarm system is designed to detect an unauthorized entry into a house or area. This circuit produces a visible light signal using led when the temperature will raise beyond the thermistor s threshold limit and this threshold limit can be varied by using variable resistance.

But this tutorial will explain to you about a simple fire alarm circuit using lm358. The c4 will be out of the r9 discharge for about 1 minute. The q1 is pull the voltage at pin 9 through d5 r13 so cause pin 9 of ic1 3 has a lower voltage. There are many typical and complex fire alarm circuits available in the form of standalone devices.

One end of the pot is connected to 5v other end is connected to gnd and the wiper terminal is connected to pin 2 of op amp. Fire alarm circuit is one of the simple and cool projects in electronics it detects the fire using a thermistor and activates the alarming sound with buzzer. In this project i will show you how to make a ir security alarm and a ir detector with the same circuit just with little modification. Comparator is configured as non inverting mode and one 10k potentiometer is connected at its non inverting terminal.

The fire alarm circuit using lm358 is a simple project which detects the fire and triggers the siren sound or a buzzer. Resistor 100 10k 100k 330 220 ohm. How to make ir security alarm a ir detector using lm358. Fire alarms has important practical application in industries where it is necessary to detect fire on right time and prevent damages to people or property.

Although both are useful and have different scope. Here is a simple fire alarm circuit designed by using 10k ntc negative temperature coefficient thermistor and lm358 ic. Ir pair ir led and photodiode 555 timer ic. Burglar alarm systems can be used in residential buildings commercial buildings offices industries and even in military locations.

This kind of alarm can also be build laser light like laser security alarm circuit but the benefit of using ir sensor is that ir light in invisible while laser is visible.