Fire Alarm Using Op Amp 741

Today i will show you how to make fire detector using ua741 ic make most sensitive fire sensor.

Fire alarm using op amp 741. We have given a very detailed description and circuit diagram for every one of the. Gain av 1 r2 r1. The electronic fuse using op amp 741 allows the gadget to draw a higher current initially but keeps a watch on it. How to make a fire sensor using ua714 most sensitive fire detector.

Here is an electronic fuse using op amp 741 which features slow blow properties a variable current limit and live indication of its operation. This simple fire alarm circuit can be used as a indicator or warning circuit for excessive fire. Inverting 741 ic op amp comparator circuit. The ic 1 is used as a low frequency multivibrator the output of which modulates the high frequency tone produced by the ic 2 multivibrator the final output is amplified and converted into a loud siren by transistor t 1 and the speaker.

Simple fire alarm circuit using thermistor and op amp circuit diagram components required project construction output and working of the project. Moreover it is simple to restore. Thermistor is used to sense the raise in temperature. Here op amp acts as non inverting comparator i e.

But it rises only after a fixed temperature. The fixed reference voltage vref is give to the non inverting terminal of the op amp. Share on tumblr simple fire alarm circuit designed by using 10k ntc negative temperature coefficient thermistor and timer ic 555 this circuit will produce buzzer sound when the temperature near thermistor raises beyond threshold and this threshold limit can be varied by using variable resistor. Circuit description of electronic siren circuit using op amp 741.

Circuit principle is similar to the first circuit i e. Simple and easy fire detector. First connect the 10 kω potentiometer to the inverting terminal of the lm358 op amp. Gain of the amplifier is given by the formula.

Siren sound is very simple. If the gadget continues to draw more current. Below is the circuit diagram of a non inverting amplifier using 741 ic and two resistors. In this circuit apart from the 741 op amp ic a light dependent resistor ldr is also used.

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. Circuit diagram of fire alarm using lm741. It is called a inverting comparator circuit as the sinusoidal input signal vin is applied to the inverting terminal. Given below are some links to some of the best op amp based circuits designed by us.

For more information on this simple fire. Sensitive intruder alarm circuit. This arrangement is named as non inverting because it amplifies the input signal while retaining the same polarity. Most of them are simple and easy to make a home.

An inverting 741 ic op amp comparator circuit is shown in the figure below.