Fire alarm
In this fire alarm circuit project, a thermistor works as the heat sensor. When temperature increases, its resistance decreases. At normal temperature, the resistance of the thermistor (TH1) is 10 kilo-ohms, which reduces to a few ohms as the temperature increases
Schematic of the Fire Alarm Circuit
NE555
(IC1) is used to seitch the t3 transistor . Switching transistors T1 and T2 drive multivibrator
NE555
(IC1). The output of IC1 is connected to npn transistor T3, which drives the loudspeaker (LS1) to generate sound. The frequency of IC1 depends on the values of resistors R5 and R6 and capacitor C2. the C1 and C2 capacitor are used to increase the timing of speaker
The home fire alarm system works off a 6V-12V regulated power supply. LED1 is used to indicate the circuits connection is done properly
if u have any issue regarding this circuit ask me i already made it
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