Many of us have had a problem of over heating computer hard disk while in long use. Here is a temperature controller circuit that switch on a DC fan to reduce temperature of your hard disk drive when it increases abnormally. The metal plate sown in the circuit should be screwed tightly with your hard disk to work it as a temperature sensor. When the temperature on hard disk increases than a preset level, the relay is activated and the fan connected to it will be start running to reduce the temperature.
Circuit Diagram of Hard Disk Temperature Controller: Click to enlarge
Working
Yes, this circuit is a simply modified version of the fire alarm circuit which is ever popular. the heart of this circuit is a transistor BC177 which has a metal case. this transistor is actually fixed on a metal plate which is held at the top heat emitting portion of the HDD. When the temperature increases, the leakge current in the transistor BC 107 will be changed to increase the bias. This small current at the collector of the heat sensor transistor will drive the transistor BC 108 further activates the relay. A DC 9 volt fan is connected to the relay will protect the HDD from over heating.
Yes, this circuit is a simply modified version of the fire alarm circuit which is ever popular. the heart of this circuit is a transistor BC177 which has a metal case. this transistor is actually fixed on a metal plate which is held at the top heat emitting portion of the HDD. When the temperature increases, the leakge current in the transistor BC 107 will be changed to increase the bias. This small current at the collector of the heat sensor transistor will drive the transistor BC 108 further activates the relay. A DC 9 volt fan is connected to the relay will protect the HDD from over heating.
Notes
- Assemble the circuit on a common PCB
- Adjust the preset to get the relay turn ON when temperature increases more than 40degree
- Make sure that the temperature sensor metal plate is well attached to the HDD
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