1. DTMF &
MC
Presented by
 Aurobindo Das
 Akankhsa Sahu
 Baba Puskarnath Panda
 Chandra Prakash Dwibedy
 Chinmaya Prasad Sahoo
GUIDED BY
Er. Ajit Kumar Satpathy
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2. Contents-
 Introduction
 Aim of the project
 Block diagram
 Working & circuit designing
 Power supply unit
 Smoothing
 Voltage rectifier
 Overall view of project
 Future scope
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3. Introduction-
To fulfill the day to day need of mankind we
need to innovate new techniques.
Mobile based appliances controlled system is
evolved to control any kind of electrical
appliances from a significant distance.
Mobile communication technique , DTMF
technology and Micro-controller are used to
configure this project.
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4. Aim of the project-
 Controlling electrical appliances by using
mobile by providing signals through DTMF circuit.
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5. Block diagram-
(OVERALL BLOCK DIAGRAM)
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6. Working & circuit designing-
(INTERFACE OF RELAY WITH MICROCONTROLLER)
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7. Power supply unit-
 Provides desire DC supply.
 Transformer is used to get 12V AC.
 Rectifier is used to convert AC to DC.
 Regulator eliminates ripple by setting out put to a fixed
voltage.
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8. SMOOTHING-
 Smoothing is performed by large electrolyte
capacitor Connected across DC supply
 Unsmooth DC is denoted by dotted line and
smooth DC by solid line
 Here a capacitor of 1000uF,400uF,100uF is used
as smoothing ckt.
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9. VOLTAGE RECTIFIER-
 A rectifier is an electrical device that converts
alternating current (AC), which periodically reverses
direction, to direct current (DC), current that flows in
only one direction, a process known as rectification.
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10. Overall view of project-10

11. Future scope-
 This project can be further enhanced to the
High voltage A.C Applications by changing the
ratings of the Relay.
 By this we can control and monitor the high
speed induction motors as well as synchronous
motors. This can be done in an economical
way.
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