Heat sensor senses the heat present around the sensor. When temperature rises above the set value, it will indicate the presence with the help of glowing LED. This heat sensor circuit can be used in kitchen or inside your PC. If your kitchen appliances or PC are over heated, it may be possible that…

This simple circuit will act as a warning alarm whenever the temperature of a device exceeds above the safety level.  This circuit can be used to monitor the heat built inside the devices like your PC, inverters, CD player etc. As excessive heat may affect the sensitive component and may lead to permanent damage. The main advantage of this circuit is its compactness that’s why it can be easily install in the device itself. This circuit will also give you power on indicator of a device with the help of blinking LED. Therefore it attract your attention that device is on. This circuit uses a negative temperature coefficient (NTC) as a sensor to sense the heat. This circuit can be operated on wide range of temperature vary from 5V to 12V. 

Heat sensor senses the heat present around the sensor. When temperature rises above the set value, it will indicate the presence with the help of glowing LED. This circuit can be used in kitchen or inside your PC. If your kitchen appliances or PC are over heated, it may be possible that it will damage the expensive components present in it. So to protect them from damage we have described a simple circuit which will give an indication when temperature around the sensor increases above the level set by you. This circuit is very small and can be easily install. In short, this simple project with easy to build electronic circuit is very useful to fight with problems like overheating.The circuit is based on two IC and few more discrete components.LM35 is a precision integrated circuit temperature and its output voltage is linearly proportional to centigrade temperature.IC CA3130 is operational amplifier which combines the advantage of both CMOS and bipolar transistor on a single chip.

This is the circuit of a Heat sensor that beeps when it detects heat. It is an ideal add on circuit in heat generating devices like Inverter and Amplifier.  Thermister is a special kind of resistor and its resistance depends on the temperature in its vicinity, Depending on its working, thermistors are divided into two types:…