BHOPAL A MINOR PROJECT ON “Temperature Controlled Temperature Controlled Fan Fan ” Submitted in partial fulfillment of Bachelor’s Degree in Electronics & Communication Engineering Of RAJIV GANDHI PROUDYOGIKI VISHWAVIDYALAYA (University of Technology of Madhya Pradesh) SUBMITTED BY:
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BHOPAL
A MINOR PROJECT ON
““Temperature Controlled FanTemperature Controlled Fan””Submitted in partial fulfillment of Bachelor’s Degree in
Electronics & Communication EngineeringOf
RAJIV GANDHI PROUDYOGIKIVISHWAVIDYALAYA
(University of Technology of Madhya Pradesh)
SUBMITTED BY:
:-Prashant Samanway (0506ec091062)
:- Shivam Vyas (0506ec091097)
:-Shrikant Tripathi (0506ec091099)
:-Veerendra Sengar (0506ec091109)
K C BANSAL COLLEGE OF TECHNOLOGY
BHOPAL
(ELECTRONICS & COMMUNICATION)
CERTIFICATE
This is to certify that project report entitled“Temperature ControlledTemperature Controlled FanFan” presented by………………………………………………………….is the bonafide presentation of their work done by him under my supervision and guidance. They have submitted this project report towards partial fulfillment for the award of degree of bachelor of engineering of Rajiv Gandhi Proudyogiki Vishwavidhyalaya during the academic year 2012 .It is further certified that this work has been submitted elsewhere for the award of any degree.
With this simple circuit you will be able to control the speed of a DC fan according to temperature measured by a temp sensor.
It’s an ideal add-on for your PC cooling fans to eliminate produced noise. Requested by some correspondents, this simple design allows an accurate speed control of 12V dc fan motors, proportional to temperature.
A n.t.c. Thermistor (R1) is used as temperature sensor, driving two directly coupled complementary transistors wired in a dc feedback circuit.
An optional circuitry was added to remotely monitor fan operation and to allow some sort of rough speed indication by means of the increasing brightness of a LED.
-: Circuit Diagram-: Circuit Diagram
.
Cost Analysis of ProjectCost Analysis of Project
SR.NO COMPONENTS USED QUANTITY COST (Rs.)
1 RESISTOR 1K 1 2
2 Trimmer Cermet 470K 1 2
3 Trimmer Cermet 22 1 2
4 RESISTOR 680 1 2
5 CAPACITOR 100F,35V (Electrolytic) 1 3
6 DIODE 4 8
7 IC 7812 VOLTAGE REGULATOR 1 10
8 L.E.D. RED (3mm.dia) 1 2
9 TRANSFORMER 230V to 0-12V, 500mA 1 35
10 COPPER CLADED BOARD 1 30
11 FABRICATION COST 1 15
12 MISCELLANEOUS 1 24
13 BC547 45V 100mA NPN Transistor 1 5
14 BD140 80V 1.5A PNP Transistor 1 5
15 Fan Motor 12V 700mA max. 1 25
16 15K @ 20°C n.t.c. Thermistor 1 10
TOTAL -- 180
Component DescriptionComponent Description
RESISTORSA resistor is a two-terminal electrical or electronic component that resists an electric current by
producing a voltage drop between its terminals in accordance with Ohm's law.
The electrical resistance is equal to the voltage drop across the resistor divided by the current that
is flowing through the resistor. Resistors are used as part of electrical networks and electronic
circuits.
Types
Fixed Resistors
Some resistors are cylindrical, with the actual resistive
material in the centre (composition resistors, now obsolete)
or on the surface of the cylinder (film) resistors, and a
conducting metal lead projecting along the axis of the
cylinder at each end(axial lead). There are carbon film and
metal film resistors. The photo above right shows a row of
common resistors. Power resistors come in larger packages
designed to dissipate heat efficiently. At high power levels,
resistors tend to be wire wound types. Resistors used in
computers and other devices are typically much smaller, often in surface-mount packages
without wire leads. Resistors are built into integrated circuits as part of the fabrication process,
using the semiconductor as the
resistor. Most often the IC will use a transistor-transistor configuration or resistor-transistor
configuration to obtain results. Resistors made with semiconductor material are more difficult to
fabricate and take up too much valuable chip area.
Variable Resistors
The variable resistor is a resistor whose value can be adjusted by turning a shaft or sliding a
control. They are also called potentiometers or rheostats and allow the resistance of the device to
be altered by hand. The term rheostat is usually reserved for higher-powered devices, above
about ½ watt. Variable resistors can be inexpensive single-turn types or multi-turn types with a
helical element. Some variable resistors can be fitted with a mechanical display to count the
turns. Variable resistors can sometimes be unreliable, because the wire or metal can corrode or
wear. Some modern variable resistors use plastic materials that do not corrode and have better
wear characteristics.
Identification of Resistors
The Standard EIA(Electronics Indusries Association) Color Code Table per EIA-RS-279 is as