1. TELEPHONE RING SENSED FLASHER IN INDUSTRIAL AREA
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2. ABSTRACT
A circuit is designed which flashes a light whenever there a call in phone.
The circuit uses an Opto-isolator and other basic components to achieve this.
This system can be very useful in a situation where there is lots of noise and it is impossible to hear the phone, such as a workshop, factory etc.

3. BLOCK DIAGRAM

4. HARD WARE EQUIPMENTS POWER SUPPLY BLOCK RESISTOR CAPACITOR
OPTO ISOLATOR
TRANSISTOR
RELAY
LOAD
DIODE
ZENER DIODE

6. EMBEDDED SYSTEMS Definition for :- EMBEDDED SYSTEMS
A combination of hardware and software which together
form a component of a larger machine.
An example of an embedded system is a microprocessor that
controls an automobile engine.
An embedded system is designed to run on its own without
human intervention, and may be required to respond to
events in real time.

7. EMBEDDED SYSTEMS

8. 1N4007
Diodes are used to convert AC into DC these are used as half wave rectifier or full wave rectifier. Three points must he kept in mind while using any type of diode.

9. ZENER DIODE

10. The resistor, RS is connected in series with the zener diode to limit the current flow through the diode with the voltage source, VS being connected across the combination.
The stabilised output voltage Vout is taken from across the zener diode.
The zener diode is connected with its cathode terminal connected to the positive rail of the DC supply so it is reverse biased and will be operating in its breakdown condition.

11. BC547 The BC547 transistor is an NPN Epitaxial Silicon Transistor.
The BC547 transistor is a general-purpose transistor in small plastic packages.
It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors.
Whenever base is high, then current starts flowing through base and emitter and after that only current will pass from collector to emitter

12. MOC3021 ( OPTO COUPLER )
Opto-couplers are made up of a LED and a light sensitive device, all wrapped up in one package
no electrical connection between the two devices
The light sensitive device may be a photodiode, phototransistor, or more esoteric devices such as thyristors, triacs etc.

13. RELAY IT IS A ELECTRO MAGNETIC SWITCH
USED TO CONTROL THE ELECTRICAL DEVICES
COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE

14. LOAD
INDUCTIVE LOAD:
An inductive load consists of a load created by a wire
wound coil, such as in a relay or solenoid, a transformer,
or any load which uses a winding over a magnetic iron core.
Breaking an inductive load is usually more severe than
breaking a resistive load and will generally produce
heavy arcing.

15. Resistor
Resistor is a two terminal passive electrical component that implements electrical resistance as a circuit element.
Resistors limits or regulate the flow of electrical current in an electronic circuit.
Resistors are available in a range of different resistance values which are used as per the requirement.

16. Capacitor
capacitor is a two terminal passive electrical component used to store the electrical energy electrostatically in an electrical field
Capacitors are two types electrolytic and ceramic.
Ceramic capacitors are unpolarized. These capacitors have negligible internal inductance or resistance.
Electrolytic capacitors are polarized and if connected backwards are likely to explode.

17. www.beyondlogic.org www.wikipedia.org www.howstuffworks.com
BIBILOGRAPHY

18. THANK ‘Q’