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Monthly Archives: February 2014

Gas detector

Feb

26

2014

bansal212
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gas sensor

 

Gas Sensor detection- in this project we gas sensor will detect signal . it will provide signal to 555 timer.

Posted in ece projects, electrical projects, electronics components, major projects, mini projects | Tags: btech projects, electonics projects, electronics projects patiala, final year projects, gas detector, latest projects, major projects, projects in chandigarh | 1 Comment |

OR gate

Feb

23

2014

bansal212
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OR gate

 

 

Posted in mini projects, minor projects, Science projects | Tags: mini projects, minor projects | Leave a comment |

Gas sensor alarm

Feb

23

2014

bansal212
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gas  sensor alarm

 

Sensors Connections will according to type of Gas sensor Use-

Normally Gas sensor start from MQ2 to MQ15 . According to gas required

For Smoke- MQ2

LPG- MQ5

Alcohol – MQ3

Components Used:

Q3- BC548

Q4-BC558

D&- LED 5mm

R12- 10k variable resistor

R13- 1k

R14+R15- 1k

555 timer

LDR- 5mm- 50 ohm

Soldering  wire

Soldering  Iron

Multimeter

PCB-

 

 

Posted in mini projects, minor projects, Uncategorized | Tags: mini projects, minor projects | Leave a comment |

light sensitive triggering

Feb

23

2014

bansal212
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light sensitive triggering   Light sensitive Triggering

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Electronic Eye

Feb

23

2014

bansal212
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electronic eye

 

Electronics Eye

 

This circuit activates a speaker output detecting the absence of light on LDR (Light Dependent Resistor). It is particularly well suited to burglar alarm system.

 

Contrary its normal use as an astable or monostable multivibrator. The transistor BC 148 is an NPN type transistor, which is use as a audio preamplifier & transistor BEL 188 is a PNP type transistor, which is use as an amplifier.

 

These both transistors is working together as a Complimentary Pair Direct Coupled Amp. For oscillation of the circuit Feedback Amp. Transistor BEL 188 is collector giving of .02 mfd or 12K Resistor starts to pre transistor BC 148.

 

The LDR is placed between bases of the preamp. Or negative supply of the circuit.

There is only 3V DC supply is required for operating the circuit.

 

PART LIST:

RESISTORS:

R1 – 270K

R2 – 12K

 

CAPACITORS:

C1 – .02MFD

 

TRANSISTORS:

T1 – BC 148

T2 – BEL 188

 

 

 

 

MISC:

8E SPK. – 1

3V Battery Holder – 1

LDR – 1

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clap switch

Feb

23

2014

bansal212
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clap switch

 

 

clap switch

Here is a circuit for electronics hobbyists that can switch on and off, a fan or a Radio etc. by the sound of a clap.

The sound of clap is received by a small microphone that is shown biased by resistor R1 in the circuit. The signal is further amplified by transistors Q1,Q2,Q3. The relay contact is connected to the power line and hence turns on/off any electrical device at output socket.

PARTS LIST:

 

RESISTORS:

R1 – 15K

R2,5,12 – 2M2

R3 – 270K

R4 – 3K3

R6,10 – 27K

R7,11 – 1K5

R8,9 – 10K

R13 – 2K2

 

MISC:

X1 – 12V / 300mA Transformer

NIC – Condenser Mic

RLY – 12V Single charge over relay

 

 

 

 

CAPACITORS:

C1 – 10KPF Disc

C2,3 – 47KPF Disc

C4 – 1000uF/16V

 

SEMICONDUCTORS:

Q1,2,3,4 – BC 149 B OR C

D1 – IN 4002

D2,3,4,5 – IN 4148

 

 

 

Posted in mini projects, minor projects, Uncategorized | Tags: mini projects, minor project, minor projects | Leave a comment |

Arduino parts sale Ludhiana Jalandhar Chandigarh Patiala Bathinda feel

Feb

23

2014

bansal212
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Innovative project solutions deals in Arduino parts in Ludhiana , Jalandhar, Chandigarh, Bathinda

Arduino UNO 3

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FM transmitter

Feb

23

2014

bansal212
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fm transmitter

 

 

FM transmitter sensor

 

  Several circuits for constructing FM transmitter have been published by EFY. The power output of most of these circuits were very low because no power amplifier stages were incorporated. The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milli watts. With a good matching 50 ohm ground plane antenna or multi element yagi antenna, this transmitter can provide reasonably good signal strength up to a distance of about 2 kilometers. The circuit built around transistor T1 (BF494) is a basic low power variable frequency VHF oscillator. A varicap diode circuit is included to change the frequency of the transmitter and to provide frequency modulation by audio signals. The output of the oscillator is about 50 milliwatts. Transistor T2 forms a VHF class A power amplifier. It boosts the oscillator signal’s power is generated at the collector of transistor T2.

FM TRANSMITTER

Componet list:-

Resistances

R1 – 3.3K

R2 – 33K

R3 – 4.7K

R4 – 33K

R5 – 1K

R6 – 100ohm

TRANSISTORS

T1 – 548

T2 – 548

CAPACITORS

C1 – 10uf/50V

C2 – 473K

C3 – 224K

C4 – 474K

C5 – 4.7

C6 – 0.02

C7 –

OTHERS

L1 – Coil

BAT9V – DC Battery 9Volt

ANT – Antenna

  • Battery connector

 

 

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Electronic harmonium

Feb

23

2014

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electronics_harmonium

 

Project Kits cost Rs 100 + Courier charges, Ready Project 200+ Courier charges

Courier charges Rs 100 to rs 200  Call us 9888708401 for order

Electronics harmonium

ELECTRONIC HARMONIUM

So much is being said and done about electronic music now a days that you may be interested to have hands on experience in this field. To get you started here is am easy to make project.

This harmonium can generate 15 different notes of music (One at a time). It has a PCB with15 parallel copper strip. Each strip corresponds to one note. So as you put the probe on a strip, the instrument plays a corresponding note.

 

The heart of the circuit is a 555 timer IC. Here the IC is used as an oscillator ( or free running multivibrator, as it is technically called) which can produced square waves of different frequencies. The frequency produced depend on the note selected by the probe. A glance at the circuit diagram tells us that when we put the probe on different strips , we are effectively changing the resistance between pin 7 and pin 2 (and 6) of 555. For convenience we may denote this resistance by Rk.

 

Now let us have a look at the functioning of 555 as an oscillator. If we assume that 555 has been given a 9 volt power supply across pins 1 and 8, it exhibits the following properties:

 

  1. When voltage on pin 2 falls below 3V, output at pin 3 is switched to +9V and pin 7 acts as open circuited. Any change in voltage level at pin 2 will not change the state of IC now.
  2. When voltage on pin 6 goes above 6V then pin 3 switches to 0V level & pin 7 acts as if it has been short circuited to ground. Any change of pin 6 will not change the state now.

 

 

 

 

 

 

 

In our ckt. We have connected pin 2 and 6 together. So if we assume that output at pin 3 is 9V, at a particular instant the combination of R1 and RK (R2 to R16) charges capacitor C3 and voltage across the capacitor keeps on increasing. When it becomes slightly more than 6V, pin 6 senses it and changes output voltage at pin 3 to 0V and pin 7 starts acting as if it has shorted to the ground. So C3 starts discharging through RK. As soon as pin 2 senses that voltage across the capacitor is less than 3V, output is switched back to 9V, so the cycle repeats itself. This way we get square waves at pin 3 since capacitor c3 charges and discharges through RK, the charge and discharge times can be varies by changing values of RK and in turn the frequencyof square wave can be changed. The values of R2 to R16 (which present RK) have been calculated to give the correct ratio within 2 percent tolerance.

 

For a sweet musical sound, it is required to have symmetrical sqaure wave ( which is in high and low state for equal periods of time) Thus R1 is kept small compared to RK in order to achieve a nearly symmetrical waveform.

The types as speaker used is not critical, you can use almost any speaker. For a loud sound use at least 10 CM speakers. You may solder resistors R2 to R16 directly on the PCB of keyboard.

 

PARTS LIST:

 

RESITORS:

R1 – 10K

R2 – 82K

R3,R5 – 68K

R4,R10,R12 – 33K

R6,R7 – 47K

R8,R13,R14 – 22K

R9 – 39K

R11 – 18K

R15 – 12K

R16 – 180K

 

CAPACITORS:

C1 – 10uF/16V

C2 – .01 uF

C3 – .002Uf

 

SEMICONDUCTOR:

IC1 – 555

S1-S15- 2PIN PUSH ON SWITCH

9V BATTERY SNAP

SPEAKER 8E LS WT

More Projects-

Metal detector

Touch Sensitive Switch

Electronics harmonium

FM transmitter

Clap switch

Electronic Eye

Light sensitive Triggering

OR gate Transistorised

Solar Water heater

Posted in Uncategorized | Leave a comment |

Touch Sensitive Switch

Feb

23

2014

bansal212
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Touch senstive switch

 

 

Touch Sensitive Switch

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