Preview

automatic temp control fan

Satisfactory Essays
Open Document
Open Document
347 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
automatic temp control fan
The schematic of an automatic cooler fan for audio amplifiers is given here. The circuit automatically switch ON the cooler fan whenever the temperature of the heat sink exceeds a preset level. This circuit will save a lot of energy because the cooler fan will be OFF when the amplifier is running on low volume. At low volume less heat will be dissipated and it will not trigger the cooler fan ON.
The temperature is sensed using an NTC (negative temperature coefficient) thermistor R2. Junction of thermistor r2 and resistor R1 is connected to the inverting input (pin3) of IC1 which is wired as a comparator. The non-inverting input (pin2) is given with a reference voltage using the preset R3. As temperature increases the resistance of NTC thermistor will drop and so do the voltage across it. When the voltage at the inverting input becomes less than that of the reference voltage (set for a particular threshold temperature) the output of the comparator goes high and switches the transistor Q1 ON. This will activate the relay and the cooler fan will be switched ON. When the temperature decreases the reverse happens. LED D2 will glow when the fan is ON. Diode D1 is a freewheeling diode.

Components Required 1. Temperature Sensor LM35 2. Op-Amp IC (LM324/741) 3. Motor Driver IC L293D 4. Potentiometer-10k 5. DC Toy motor 6. Propeller 7. 7805 Voltage Regulator 8. 100uF Capacitor 9.Multi-meter (Digital one is Preferred) 10.A Breadboard
Description
Basically the circuit switches ON a toy motor fan connected to the motor driver whenever heat is applied to the temperature sensor unit using say a burning matchstick. The wind from the motor fan would blow off the matchstick and switches OFF itself automatically.

Here the Temperature is the output to be controlled. A feedback is generated using the sensor which is fed into comparator which acts as a controller here. And the power is the input.
Continue Reading
View Writing Issues

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Nt1310 Unit 5 Lab
    • 361 Words
    • 2 Pages

    Nt1310 Unit 5 Lab

    4. What is the significant difference in the temperature of the PC (with the processor fan) with and without the…

    • 361 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Activity C03: Heat Of Fusion
    • 1576 Words
    • 7 Pages

    Activity C03: Heat Of Fusion

    In the first part of the activity, observe a phase change for ice while measuring the temperature of the system. Use the Temperature Sensor to measure the temperature of a container of ice as small amounts of warm water are added to the ice. Use DataStudio or ScienceWorkshop to record and display the temperature data.…

    • 1576 Words
    • 7 Pages
    Good Essays
    Read More
  • Powerful Essays

    Unit 2 Assignment 1
    • 1912 Words
    • 8 Pages

    Unit 2 Assignment 1

    A heat sink is an electronic device that has been designed specifically to draw heat away from the CPU and prevent it from overheating. However, the heat sink itself can become too hot sometimes. So therefore, a fan is often used to keep cool both of the CPU and the heat sink.…

    • 1912 Words
    • 8 Pages
    Powerful Essays
    Read More
  • Satisfactory Essays

    The Effects Of Ceiling And Attic Fans
    • 65 Words
    • 1 Page

    The Effects Of Ceiling And Attic Fans

    Ceiling/attic fans are also considered the most affected because they effectively circulate the air in a room. Ceiling fans may allow you not to use you air conditioning altogether during hot summer and it save you up by 40%. It also makes the room feel cooler than it actually is. For cooling effect you fan should run in the forward giving you the chill effect.…

    • 65 Words
    • 1 Page
    Satisfactory Essays
    Read More
  • Good Essays

    Hypertension and Biology U01a1-homeostasis-an Analogy
    • 907 Words
    • 4 Pages

    Hypertension and Biology U01a1-homeostasis-an Analogy

    Part 1 - Regulates your body temperature when you are outside on a cold winter day.…

    • 907 Words
    • 4 Pages
    Good Essays
    Read More
  • Good Essays

    Vfd's on a Utility Cooling Tower
    • 2538 Words
    • 11 Pages

    Vfd's on a Utility Cooling Tower

    Abstract--The temperature control strategy for the cooling tower fans involves two automatic modes of operation as well as provisions for manual operation. Both modes will provide sequencing for starting/stopping each of the 14-250hp, 480vac fans that have been made available for automatic control. Auxiliary power savings on the 3MVA, 4160vac tower load can be between 0.5 – 1.0MVA 6 months a year in the Midwest with the variable frequency drives (VFD’s). The first, automatic mode, HEAT RATE, will be aimed at operating the fans at or near the circulating water temperature which results in the optimal unit heat rate for the given load. The goal of the second mode, AUX POWER, will be to minimize the auxiliary power consumption by operating at or near the highest back pressure possible without reaching 7.0 inHgA. This mode is only intended for use during normal operation at full/ partial load, and not during start-up/shutdown. During both modes, the minimum circulating water temperature will not be allowed to go below 70o F at low ambient temperatures to prevent tower cell icing. Each fan may be operated manually in either bypass or through the VFD via the DCS or locally at the MCC. When all fans in AUTO have been running continuously at 1 00% speed for 15 minutes in either automatic control mode, a sequential transfer to BYPASS shall begin using fan hysteresis. In HEAT RATE mode, if none of the fans in AUTO are running, the first fan in the sequence shall be started and held at 25% minimum speed. The remaining available fans shall be sequentially started until all are at 25%. The speed set point shall then be raised to 100% for all fans. When AUX POWER mode is selected, the DCS PID will receive HP hot well temperature as its input. The set point shall be the saturation temperature corresponding to 6.25 in HgA (3.07 psi), with…

    • 2538 Words
    • 11 Pages
    Good Essays
    Read More
  • Better Essays

    Managed Care
    • 3374 Words
    • 14 Pages

    Managed Care

    complicated system. Over the next few pages I am going to try and go over the main parts of the…

    • 3374 Words
    • 14 Pages
    Better Essays
    Read More
  • Powerful Essays

    Disease Diagnoser and Pill Dispenser Using Embedded Network
    • 21115 Words
    • 85 Pages

    Disease Diagnoser and Pill Dispenser Using Embedded Network

    DISEASE DIAGNOSER AND PILL DISPENSER USING EMBEDDED NETWORK INDEX NO. TOPIC PAGE NO. 1.…

    • 21115 Words
    • 85 Pages
    Powerful Essays
    Read More
  • Powerful Essays

    Chillers
    • 2504 Words
    • 11 Pages

    Chillers

    A chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. A vapor-compression water chiller comprises the 4 major components of the vapor-compression refrigeration cycle (compressor, evaporator, condenser, and some form of metering device). These machines can implement a variety of refrigerants. Adsorption chillers use municipal water as the refrigerant and benign silica gel as the desiccant. Absorption chillers utilize water as the refrigerant and rely on the strong affinity between the water and a lithium bromide solution to achieve a refrigeration effect. Most often, pure water is chilled, but this water may also contain a percentage of glycol and/or corrosion inhibitors; other fluids such as thin oils can be chilled as well.…

    • 2504 Words
    • 11 Pages
    Powerful Essays
    Read More
  • Powerful Essays

    Impact and value of Nest
    • 2090 Words
    • 9 Pages

    Impact and value of Nest

    According to online feedbacks from Nest’s customers, benefit brought by Nest’s thermostat when it’s working normally is obvious and superior to any of its competitors. Nest’s technology of auto-learning, auto-schedule and auto-sense give the device the ability to collect data from real world and combine it with virtual world algorithm so that the customers can always enjoy personalized and accurate in-door temperature control without bothering themselves to adjust thermostats manually. The air-wave technology calculates the precise time that the air-conditioner compressor can be turned off before reaching the desired temperature while still being able to maintain the target temperature afterwards with the cold air generated a short period after turning off. This not only provides customers with a room temperature much closer to the desired one, but also increases energy efficiency and reduces energy bill for customers together with the three technologies mentioned previously.2 By partnering with energy companies and creating projects such as Rushing hour awards and seasonal savings,3 Nest is giving its customers a much clearer idea about their own energy consumption pattern, raising their awareness of energy saving,…

    • 2090 Words
    • 9 Pages
    Powerful Essays
    Read More
  • Better Essays

    Aircraft Systems
    • 1275 Words
    • 6 Pages

    Aircraft Systems

    This is a system which concerns with the conditioning of cold air at high altitude to a comfortable temperature for uses of passengers and crew. This is one of the Prime systems within the environmental control system, as in altitude of 39000 feet or so of an aircraft it will be impossible for passengers to survive without air conditioning. Cabin air conditioning must provide comfort conditions (i.e. some 22 ºC, 100 kPa, and 60% RH) within the cabin. Besides, this system must provide ventilation, pressurization, heating, cooling, humidification, dehumidification and disinfection. Furthermore, cabin air monitoring provides the basic smoke detection means for fire warning.…

    • 1275 Words
    • 6 Pages
    Better Essays
    Read More
  • Powerful Essays

    Inside the System Unit
    • 2819 Words
    • 12 Pages

    Inside the System Unit

    • The power supply has a fan that provides the system and components from overheating.…

    • 2819 Words
    • 12 Pages
    Powerful Essays
    Read More
  • Satisfactory Essays

    Motor Control Panel
    • 370 Words
    • 2 Pages

    Motor Control Panel

    2. Connect wires from motor leads in junction box(s) to terminals in panel per print.…

    • 370 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Avanti 12 Bottle Thermoelectric Counter Top Wine Bottles Case Study
    • 1105 Words
    • 5 Pages

    Avanti 12 Bottle Thermoelectric Counter Top Wine Bottles Case Study

    Te owners take pride in its cooling methodology which comes with the integrated soft touch display and it strictly controls the environment for your wine. The main challenge that usually happens is with the troublesome vibrations. The vibration free wine coler ensures that the sediment is not disturbed when the bottles are in storage, But the best thing about the Avanti Thermoelectric Wine cooler is the fact that it never disturbs the bottle sediments and leaves the taste unaltered, I completely agree that when comes with storing the bottle that challenge remains with preserving the quality with the taste and this is something that is been guaranteed with Avanti. As per the review of the various wine aficionados they have rated it as the most sought after wine cooler and are very satisfied with the cooler. It has integrated soft touch digital display come with the auto defrost and the usual power consumption is of 110V/60Hz. The LED lighting with the tempered glass keeps the wine protected. The LED internal illumination stays for about 30 seconds but if one holds down the two buttons it unlocks the display. This free standing unit comes with the reversible door hinges for the added convenience and keeps the temperature up to 53 degree Fahrenheit for…

    • 1105 Words
    • 5 Pages
    Good Essays
    Read More
  • Powerful Essays

    Automatic Temperature Fan Speed Control
    • 3897 Words
    • 16 Pages

    Automatic Temperature Fan Speed Control

    This is a standard circuit which can be used to adjust the brightness of mains lights and the speed of AC motors. It uses a triac, diac and has a radio-frequency interference (RFI) noise suppression circuit built into it as well. The circuit controls the average power to a load through the triac by phase control. The AC supply is applied to the load for only a controlled fraction of each cycle. The triac is held in an OFF condition for a portion of its cycle then is triggered ON at a time determined by the circuit. Each time the triac is turned on, the load current changes very quickly - a few micro seconds – from zero to a value determined by the lamp resistance and the value of the mains voltage at that instant in time. This transition generates Radio Frequency Interference. It is greatest when the triac is triggered at 90 degree and least when it is triggered at close to zero or 180 degree of the mains AC waveform. L-C suppression network is thus used to suppress these electrical noises.…

    • 3897 Words
    • 16 Pages
    Powerful Essays
    Read More

Related Topics