C.K. Pithawala College Of Engineering And

Technology

Physics Project

Cell phone Detector

1st Year Mechanical Div. - B

Prepared By :-

1. Parva Patel – 902. Chitrang Patel – 893. Meet Tamakuwala – 1044. Kamil Patel - 84

Cell Phone Detector :-

• As increase in the technology in the world using the electronic equipments are being used in a wrong way like, in the examination halls and confidential rooms. To avoid this we are introducing a project called CELLPHONE DETECTOR

• The circuit can detect the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode.

• Previously, there was no technology to detect the cell phones in the examination hall and in cell phone restricted areas. There is manual checking and there is still a chance of having the cell phone with the person if he is not checked properly. So to avoid this problem, an automatic detection of cell phone is introduced.

• Cell phones are used in good way and also in a bad way. When the class is going on, students intend to use their cell phones and not listening to what is being taught. These days, students are also carrying their cell phones to the examination halls to copy which would help them to get good marks.

Circuit for cell phone detector :-

Components in circuit of cell phone detector

Components used in the circuit:- 1. IC CA31302. NE 5553. Resistors :- • 2.2 M Ohm x 2nos• 100 K Ohm• 1 K Ohm x 2• 12 K Ohm• 15 K Ohm4. Capacitors :-• 22 pF x 2 nos• 0.22 pF• 100 muF• 47 pF• 0.1 pF x 2 nos• 0.01 pF• 4.7 muF

5. BC5486. Switch7. Battery8. Buzzer9. LEDs

1. IC CA3130

• CA3130A and CA3130 are op amps that combine the advantage of both CMOS and bipolar transistors. Gate-protected P-Channel MOSFET (PMOS) transistors are used in the input circuit to provide very-high-input impedance, very-low-input current, and exceptional speed performance. The use of PMOS transistors in the input stage results in common-mode input-voltage capability down to 0.5V below the negative-supply terminal, an important attribute in single-supply applications.

• The CA3130 Series circuits operate at supply voltages ranging from 5V to 16V, (±2.5V to ±8V). They can be phase compensated with a single external capacitor, and have terminals for adjustment of offset voltage for applications requiring offset-null capability. Terminal provisions are also made to permit strobing of the output stage. The CA3130A offers superior input characteristics over those of the CA3130.

2. NE 555

• The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element. Derivatives provide up to four timing circuits in one package.

• Depending on the manufacturer, the standard 555 package includes 25 transistors, 2 diodes and 15 resistors on a silicon chip installed in an 8-pin mini dual-in-line package (DIP-8).[2] Variants available include the 556 (a 14-pin DIP combining two 555s on one chip), and the two 558 & 559s (both a 16-pin DIP combining four slightly modified 555s with DIS & THR connected internally, and TR is falling edge sensitive instead of level sensitive).

3. Resistors

• A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits. According to Ohm's law:

• V = IR

4. ) Capacitors

• A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store electrical energy temporarily in an electric field.

• An ideal capacitor is characterized by a single constant value, capacitance, which is measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them.

5. BC 548 Transistor

• A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.

• The BC548 is a general purpose NPN bipolar junction transistor found commonly in European electronic equipment and present-day designs in Australian and British electronics magazines where a commonly-available low-cost NPN transistor is required.

• BC548 is general purpose silicon, NPN, bipolar junction transistor. It is used for amplification and switching purposes. The current gain may vary between 110 and 800. The maximum DC current gain is 800.

Application of Cell phone Detector :-

1. It can be used to control the use of cell phone in examination hall.

2. It can be used in confidential rooms.3. It can be used at petrol pumps, gas station

where mobile phones are prohibited. 4. It can be used at government places like court

where mobile phones are not allowed.5. It can be used in schools classrooms.

Limitations :- 1. This circuit detects mobile frequency from 0.9

to 3 Ghz so smart phones cannot be detected.2. The range of this circuit to detect cellphones is 2

meter.

Future scope :-

1. Frequency can be increased so that the circuit can detect smart phones.

2. The range of this circuit can be increased.