BASIC ELECTRONICS PROJECT4- SIMPLE ELECTRONIC CODE LOCK

Hiii….friends this time we ae going to implement another 555 timer IC project. With this project we can operate the operation of locking or unlocking it is just a dummy project it does not lock or unlock any thing it just operates some electronic action when switches of correct number are pressed.

CIRCUIT DIAGRAM

Here we are using six switches (  you can add more) in which 3 are CORRECT SWITCH and 3 are WRONG SWITCHES only right combination of COORECT SWITCHES unlocks the circuit.

In the circuit 555 timer IC is used in bistable mode , which can be reset or triggered by applying a low input on the corresponding pin. The CORRECT SWITCHES are connected to trigger pin( PIN2) when all the switches are pressed trigger pin receives a low input and the LED glows which means the circuit is unlocked. But in case any WRONG SWITCH connected in parallel  and connected to reset pin(PIN4) is pressed the circuit gets reset and LED does not blink means circuit is not unlocked so a correct switch combination can only unlock the circuit.  In this circuit the circuit unlocks only when S1, S2, S3 are pressed and unlocks if any of S4,S6,S5  is pressed .For operating any AC appliance u can use relay also.

COMPONENT REQUIRED

R1-R2         RESISTORS(100K)

R3               RESISTOR(1M)

R4               RESISTOR(330R)

C1,C2         CAPACITOR(1nF)

S1-S6          SPST SWITCHES

D1               LED( YOUR FAVOURITE COLOUR..;))

U1               IC555

I hope you found it helpful, in case of any doubt, question or critical view just leave a comment.

THNX…J

BASIC ELECTRONICS PROJECT3- TRAFFIC LIGHT PROJECT

Hiiii….. friends , this time I am posting  a basic electronicS project of TRAFFIC LIGHT, its really interesting and easy to implement. With this project we can make a dummy traffic light system, flashing red, yellow and green LEDs in a desired sequence and timing.

CIRCUIT DIAGRAM

Here a 555 timer IC is used to generate clock pulses and its output is driving another IC 4017, which is 1-10 counter IC, every time 4017 receives a clock one of its ten output goes high we are using these outputs in flashing our LEDs in a proper sequence and timing. A variable resistor is also provided to adjust the flashing time of LEDs, with the help of this variable resistor we can adjust our LED flashing time from several seconds to some minutes. You can easily implement it on any general purpose PCB or even on a breadboard.

COMPONENTS REQUIRED

D1-D9, D13             DIODES(1N4007)

R1,R4,R5                  RESISTOR (330R)

R2,R3                              RESISTOR (10K)

D10, D11, D12         LEDs( RED, YELLOW, GREEN)

RV1                            VARIABLE RESISTOR (1M)

U1                               IC NE555

U2                              IC 4017

C1                                CAPACITOR (10Uf)

I hope you found it helpful, in case of any doubt, question or critical view just leave a comment.

THNX…:)

BASIC ELECTRONICS PROJECT2- TONE GENERATION CIRCUIT USING NE555

Hiiii…..friends now its time for another basic electronic project for beginners. This time I  am going to show you a simple tone generator circuit using NE 555 IC. In this project we will see how we can generate a pleasant melody by using some basic electronic componentS.

CIRCUIT DIAGRAM

In this circuit NE555 IC is used in astable mode(free running mode). In this circuit a variable resistor is also provide by which we can control the pitch of tone generated and we can get multiple tones by this single circuit. The capacitor is provided to reduce the noise interference and getting a smooth pitch sound on adjusting.

Want more detail about NE555 just go through the DATASHEET OF 555 TIMER IC

I hope this project was an interesting one, in case of any doubt leave a comment.

THNX..:)

BASIC ELECTRONICS PROJECT 1- 7 SEGMENT DISPLAY COUNTER / INCOMING PERSON COUNTER

Hiii…….friends this time I am here with a very interesting projects for those who have just started with electronics. With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in the room.

Circuit diagram

Here a counter IC 7490 is  used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and decoder IC is decoding that value to 7 segment output . Every time when you will push the switch the clock of IC7490 will be triggered and as a result count will increase by 1 . Hence with this simple project we can display numbers 0 to 9 on seven segment display just by pressing switch. It’s a very easy circuit and you can easily implement it on a general purpose PCB.

NOW ITS TIME TO MAKE USE OF THIS CIRCUIT IN COUNTING THE NUMBER OF PERSONS ENTERING IN THE ROOM...... LETS SEE HOW….??

So  instead of using switch we will use LDR here , we will place LDR at the entry door in such a manner that the shadow of the entering person should fall directly on LDR , when shadow will fall on LDR clock of IC 7490 will be triggered and as a result the count will increase by one. Circuit wilh some small changes  is as shown. Variable resistor is used to adjust the resistance to synchronize the light intensity for better results.

COMPONENT REQUIRED

U1                  IC7490

U2                  IC 7447

R1-R7            RESISTORS 330R x7

SEVEN SEGMENT DISPLAY( common anode)

Push button

POWER SUPPLY ( 5 to9 V)

LDR and VARIABLE RESISTOR

I hope this was a interesting project and u can use it as your school project or mini project as well.  In case of any doubt, question or critical view just leave a comment.

         THNX…J

BASIC ELECTRONICS TUTORIAL4- COMPONENTS AND THEIR SYMBOLS PART2

   Hiii.........friends this is second part of  our last tutorial   BASIC ELECTRONIC TUTORIAL4- COMPONENTS AND THEIR SYMBOLS  , in this tutorial we are going to discuss about some more components ,their symbols and their uses. lets continue......


LOGIC GATES

AND 
If all the inputs of an AND gate are HIGH, then the output will also be HIGH. If any one of them is LOW, the output will also be LOW.

OR
 If any one of the input is HIGH, the output will also be HIGH. If both inputs are LOW, the output will also be LOW.

NOT
 

Also known as the inverter Gate. There is only one input for this gate. If the input is HIGH, the output will be LOW. If the input is LOW, the output will be HIGH.

NAND

Short form for NOT AND Gate. Of all the inputs are HIGH, the output will be LOW. If any one input is LOW, the output will be HIGH.

NOR

Short form for NOT OR. If both inputs are LOW, the output will also be LOW. For other cases, the output will be HIGH.

EX-0R

Short form for Exclusive NOR. If both inputs are either in LOW state r HIGH state, the output will be LOW. If both inputs are different, the output will be HIGH.

EX-NOR

Short form for Exclusive NOT OR. If both the inputs are the same, the output will be HIGH. If both are different, the output will also be different.

SWITCHES

Push Switch

This is an ordinary switch that passes current only upon pressing.

Push to Break Switch

The push to break switch is usually kept in the ON state (closed). It turns to OFF state (open) only when the switch is pressed.

Singe Pole Single Throw Switch

Also known as the ON/OFF switch. This switch allows the flow of current only when it is kept ON. Abbreviated as SPST.

Single Pole Double Throw Switch

Also known as the 2-way switch. It can be also called as an ON/OFF/ON switch as it has an OFF position in the center. The switch causes the flow of current in two directions, depending on its position. It can be abbreviated as SPDT.

Double Pole Single Throw Switch

Abbreviated as DPST. Can also be called as a dual ON-OFF switch. This is used to isolate between the live and neutral connections in the main electrical line.

Double Pole Double Throw Switch

Abbreviated as DPDT. The switch uses a central OFF position and is applied as reversing switch for motors.

Relay

is abbreviated as ‘RY’. This device can easily switch a 230 Volt AC mains circuit. It has three switching stages called Normally Open (NO). Normally Closed (NC), and Common (COM).

AUDIO AND RADIO DEVICES

Microphone

This device is used for converting sound to its corresponding electrical energy. Abbreviated as ‘MIC’.

Earphone

Does the reverse process of microphone and converts electrical energy into sound.

Loudspeaker

Does the same operation as an earphone, but converts an amplified version of the electrical energy into its corresponding sound.

Piezo-Transducer 

It is a transducer that converts electrical energy into sound.

Amplifier

Used to amplify a signal. It is mainly used to represent a whole circuit rather than just one component.

Aerial

This device is used to transmit/receive signals. Abbreviated as ‘AE’.   

So these are basic electronic components with their symbols and brief discription. I  hope this article was beneficial for beginners. in next tutorial we will discuss about some other basic electronic topics. If you have any doubt, question or critical comment please post here.


     THNX...:)