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A thermostat is a device for regulating the temperature of a system so that the system's temperature is maintained near a desired set point temperature. The thermostat does this by controlling the flow of heat energy into or out of the system. That is, the thermostat switches heating or cooling devices on or off as needed to maintain the correct temperature.

A thermostat may be a control unit for a heating or cooling system or a component part of a heater or air conditioner. Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature. The output of the sensor then controls the heating or cooling apparatus.

 

Many thing in our daily need that can be easily by implement a simple applied technology. So our life become easy and comfort. We can make anything work automatic, or work without our intervention so if we forget to run it, or to turn off it, they will be done by their shelf.

 

By a simple applied technology, such as electronics, we can solve many simple problem as mentioned above. With the small dimension of electronic component and small power too, we can realize our need, such as automatic lamp, remote controller, water tank level controller.

 

Beside all that mention above, we can make many device that valuable to our need, such as decorative lamp, amplifier, detector etc. The simple applied electronic circuits are divided in to two groups, analog and digital circuitry. 

 

Analog electronic circuits are those in which signals may vary continuously with time to correspond to the information being represented. Electronic equipment like voltage amplifiers, power amplifiers, tuning circuits, radios, and televisions are largely analog (with the exception of their control sections, which may be digital, especially in modern units).

 

In digital electronic circuits, electric signals take on discrete values, which are not dependent upon time, to represent logical and numeric values. These values represent the information that is being processed. The transistor is one of the primary components used in discrete circuits, and combinations of these can be used to create logic gates. These logic gates may then be used in combination to create a desired output from an input. In this page you can find one of the circuit.

 

 

Thermostat Elektronik

 

NTC adalah jenis resistor yang akan mengecil nilai resistansinya ketika terjadi kenaikan suhu lingkungannya. dengan demikian NTC dapat digunakan sebagai sensor untuk mengendalikan nyala heater (pemanas). Rangkaian untuk mengendalikan heater adalah seperti terlihat pada Gambar 1. Pada rangkaian Gambar 1, NTC digunakan bersama resistor sebagai rangkaian pembagi tegangan. Ketika suhu di sekitar NTC naik, maka tegangan pada masukan inverting (-) akan ikut naik. Jika kenaikan tegangan pada masukan inverting melampaui masukan non-inverting (+), maka output op-amp akan rendah, sehingga relay akan mati sehingga saklar terputus yang akan mematikan heater. Untuk mengatur batas suhu yang kita inginkan, maka nilai R2 dapat ditala pada harga tertentu. Rangkaian ini disebut juga sebagai rangkaian on-off controller, yang dapat digunakan untuk mengatur suhu, namun histeresisnya cukup besar.

 

 

 

 

 

 

Gambar 1. Rangkaian Thermostat Elektronis.

 

 

 

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