You can make a simple Heat Monitor using only a few components. It can be attached to heat generating devices like Amplifier, Inverter and Computer. The sensor is an NTC Thermistor always monitor the heat in its vicinity and activates the alarm LED if the heat increases above the normal level.
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Excess heat in electronic devices can damage the delicate CMOS components and it is necessary to monitor the temperature in these devices. With this Five component circuit, you can monitor the temperature in the heat generating devices like CPU, Inverter, CD player, Amplifier etc. It gives a warning alarm, when the temperature inside the cabinet of the device exceeds the normal level. It uses an NTC Thermister as heat sensor. The circuit is too small enough to enclose inside the gadget.