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Wednesday, 6 February 2019

February 06, 2019

Emergency Buzzer alarm!

Emergency Buzzer alarm!

Hello, Everyone today in this article I want to discuss simple emergency Buzzer alarm Circuit. The circuit consists of some basic components like resistors,  Transistors, Buzzer alarm, and a LED. You can run the circuit between 9v to 12v of voltage. If you cut the loop wire then the buzzer and the LED will be On condition.


Needed components:



  1. Red LED
  2. Buzzer 5v
  3. 680 Ohm resistor
  4. 2.2k Ohm resistor
  5. BC548B NPN Transistor
  6. 9v Battery
  7. 9V Battery Clip

Indian link for Buying:

Amazon.in


LED: https://amzn.to/2SdNcdt


Buzzer: https://amzn.to/2S97954

Different values of resistor: https://amzn.to/2t7FxOF

9v Battery: https://amzn.to/2GcseVX


9v Battery Clip: https://amzn.to/2TwOvkj


BC548B NPN Transistor: https://amzn.to/2SaC15i






International links for Buying:

Bangood.com:


 LED: https://www.banggood.in/custlink/3mDvySETET


Buzzer: https://www.banggood.in/custlink/Gv3GRIhuJr

Different values of resistor: https://www.banggood.in/custlink/KDvGYIdTJt


9v Battery: https://www.banggood.in/custlink/DKDvyZh1FJ


9v Battery Clip: https://www.banggood.in/custlink/Km33E8h7JI


BC548B NPN Transistor: https://www.banggood.in/custlink/mKmvh8ywVK




Amazon.com:


 LED: https://amzn.to/2MTAwSR


Buzzer: https://amzn.to/2t9SszE

Different values of resistor: https://amzn.to/2t9CO7w


9v Battery: https://amzn.to/2TvDCip


9v Battery Clip: https://amzn.to/2t7OV4Q


BC548B n-p-n Transistor: https://amzn.to/2GrRkza



YouTube Video:

Watch the YouTube video from Creative Creator for more information about Emergency Buzzer alarm.





Circuit Schematics:





How the circuit works?

This is a basic NPN Transistor Circuit which is used in the circuit.  The basic principles NPN  transistor is that if you give voltage into the transistor's base then the transistor became conductive and current flows from transistor's collector to Emitter. If you connect any series load then the circuit will run the load.


  1. At first, the loop wire is connected. so it means that the Base and the Emitter point is short-circuited. So, for this reason, the current goes to the shortest path as possible. So current will flow from Vcc to GND through 2.2k Resistor. So, no current will flow into the transistor's base and for this reason, the transistor will not be conductive. As a result, the current will flow from collector to Emitter. And for this, the LED and the Buzzer will not work.
  2. Now let's say I have cut the wire which is short-circuited before. (I mean  Base and Emitter Connected wire). Now if we turn on the power supply then the current flows from Vcc to transistor's Base through 2.2k Resistor. For this reason, the transistor became conductive and the current flows from the Transistor's collector to Emitter and the load which is connected in series will be on for this reason. (Here the load is parallelly connected RED LED and the Buzzer).  For this reason, the buzzer gives beep sound. And the circuit will work. 



Note: 

Always check the Transistor number before using it. Otherwise, it may be a PNP transistor.
Check out all the data sheet and pinouts. A different transistor has different pin numbering.





        That is all about his topic hope you guys enjoy. You can also read our previous topic of the video: http://bit.ly/2WdEjPs


Wednesday, 30 January 2019

January 30, 2019

How to Flash 220V Light Bulb ?

Hello Everyone, Today in this article I will discuss Simple 220V Light Bulb Flashing Circuit. For this project, I will use a Fluorescent Lamp Starter It will be used as a 220V Light Bulb Flasher. You don't need any additional components for this project. There is a filament inside of the starter It works with any type of  Fluorescent lamp starter. There is a simple logic is that when the terminal of the stater is heated then the thermostats plate increases and became short-circuited. So it means that current flows from the light became turned on. After that, the thermostats cooled and then starter acts like an open circuit. And then the light became off. I have used 100W LED Bulb as a load you can use this as well. This is a very simple circuit which is made up of fluorescent lamp starter. 



Needed Components:


  1. A Fluorescent Lamp Starter.
  2. 100W Bulb
  3. Some Connecting Wires
  4. A  2 Pin Plug

Watch the Youtube Video:

First Watch the youtube video then It will be easier to Understand.





How Does the Circuit Works?

There is a filament inside of the starter It works with any type of  Fluorescent lamp starter. There is a simple logic is that when the terminal of the stater is heated then the thermostats plate increases and became short-circuited. So it means that current flows from the light became turned on. After that, the thermostats cooled and then starter acts like an open circuit. And then the light became off. I have used 100W LED Bulb as a load you can use this as well. This is a very simple circuit which is made up of fluorescent lamp starter. 



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Monday, 14 January 2019

January 14, 2019

LED Dimmer Circuit with LM317





Today in this article we will discuss LED Dimmer Circuit or simple adjustable Voltage regular Circuit with LM317. LM317 was first introduced in 1970 from then until now the I.C is used for small Transformer Based Variable Power supply.

Things needed for the Circuit:


  1. 330 Ohm resistor
  2. LM317
  3. One 12v LED as a Load
    (We will use this LED for LED Dimming Observation.)
  4. A 12V Power Supply.

Circuit Diagram:


Watch The Youtube Video:




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How Does it work?

This is a simple circuit with LM317. We use a Potentiometer/ Trimmer for varying the voltage of adjusting pin. It is connected in such a way that if the residence of the potentiometer is increased then the LM317 output voltage decreases. And in a similar way if the resistance decreases then the output voltage from LM317 increases.

Note: I have used a 10k linear potentiometer. If you want to get more accurate output then I will suggest you go for multiturn trimmer or potentiometer. It will give you a great experience.

You May Also like our another Article about LED Dimmer with 555 Timer

Sunday, 6 January 2019

January 06, 2019

Simple Touch Sensor



Today in the article I will discuss Simple touch sensor/ Transistor Touch sensitive circuits. Here I will discuss n channel MOSFET touch-sensitive circuits. MOSFET has 3 pins gate drain and source. The point gate is used for turning on and turning off the MOSFET. Basically, we use a PWM signal for controlling the MOSFETs. But here we are using our Hand as a resister which can activate or deactivate the MOSFET.

Needed components for Simple touch sensor:

  1. N-channel enhancement type MOSFET IRFZ44N
  2. 1K resistor Click Here
  3. 1 LED Click Here
  4. 9v Battery Clip Click Here
  5. 9v Battery  




Watch the YouTube video:

Here is the YouTube video from Creative Creator, This will help you with more clarification.




Schematics of the Circuit for Simple touch sensor:


How the simple touch sensor circuit works?


  1. MOSFET has 3 pins gate drain and source. The point gate is used for turning on and turning off the MOSFET. Basically, we use a PWM signal for controlling the MOSFETs. But here we are using our Hand as a resister which can activate or deactivate the MOSFET.
  2.  If we touch the gate Pin and the Vcc then the current flows from our hand to the gate pin. There it suddenly activates the MOSFET. And the current flows from drain to source.
  3. In the MOSFET there is an inbuilt capacitor this took the charge and stores the energy. The current will flow from drain to source as long as capacitor stores energy.
  4.  Now if you touch the gate Pin and the GND Pin then the stored capacitor discharges and the current flow become lower. There will be higher resistance between drain and source.
  5. So, there will be no flow between drain and source.





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That is how the circuit works.

You can also like our another article about Simple LED Blinking Circuit 🤗

Monday, 31 December 2018

December 31, 2018

Simple LED Blinking Circuit

Let's talk about the LED Blinking Circuit. LED Blinking Circuit is an easy Circuit consists of 3 basic components like 1 Transistor, 3 RGB (Multi-color) LEDs. This is a Basic transistor Circuit. The LEDs are connected in series with the Base of the transistor. When the 12v Vcc is on then the RGB LEDs connected in series changes their color in a systematic way. The changing color triggers the transistors Base. As the Transistor Base Voltage is changing the amplified signal from the transistor also changing. I have connected 12v load LED at the transistor Output section. So it also blinks in a systematic way.


Needed Components:


  1. BC547 n-p-n Transistor.
  2. 2.2k Resistor.
  3. RGB (Multi-color) LEDs (3)
  4. Load LED 12v
  5. 12v Power supply (I used CPU SMPS)
  6. PCB Board (Optional)
  7. Breadboard (Optional)


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Circuit Schematics Of LED Blinking Circuit:

Here is the schematics of the LED Blinking Circuit. I have used Basic Components for making the Circuit. You can use a breadboard for testing purposes.



Watch the YouTube video:



How the Circuit works?


  1. This is a Basic transistor Circuit. The LEDs are connected in series with the Base of the transistor.
  2. When the 12v Vcc is on then the RGB LEDs connected in series changes their color in a systematic way.
  3. The changing color triggers the transistors Base. As the Transistor Base Voltage is changing the amplified signal from the transistor also changing.
  4. I have connected 12v load LED at the transistor Output section. So it also blinks in a systematic way.


Note:


  1. I have used BC547 for the demonstration purpose. If you want to run bigger loads like RGB LED strips then I will highly suggest you to use High Power Output rated Transistor.
  2. As a power transistor, you can use N-Channel MOSFETs like IRFZ44N N-Channel enhancement type MOSFET.
  3. You can use Heatsink for Thermal Cases.
  4. You can also go one step ahead and try to improve the Blinking Depth by Changing the values of the Resistor Between 50Ohm and its above.
  5. As you are working with a transistor you might know that transistor is a semiconductor device. So it has some resistive characteristics. So the transistor 0.7v for international Characteristics.
  6. If you want to run 12V LED strips then I will suggest you go for 13v Power supply. For this case, the LEDs will Blink with its maximum brightness.


Pros of the Circuit:


  1. The Blinking LED circuit is easy. It requires fewer Components. Great for Hobby Projects.
  2. No I.C. required for Generating PWM.
  3. The circuit will Give You many blinking effects as 3 LEDs are in series, they all LED combines and gives Great blinking effects.


Cons of the Circuit:


  1. The circuit is great for Hobby Projects but there are some problems with the Circuit. If the circuit runs with one RGB LED then the circuit will be effective.
  2. We used some simple components like LEDs for the Blinking. This will not give you as blinking Depth Compared with PWM signal from the NE555 timer.

               Those are the only corns I found in the Circuit. I will suggest you to make make the Circuit yourself and you should try to modify the circuit and send me your Schematics through Social media.
If you have any doubt then feel free to write in the comments section. I read each and every from you guys. This motivates me a lot for writing articles for you Guys.

You may also like our another article about LED Dimmer Circuit with NE555 Timer 😀

Thursday, 27 December 2018

December 27, 2018

LED Dimmer Circuit



In this article, we are talking about the LED dimmer circuit. It is a basic circuit made out of 555 timer. Let us try to understand the LED dimmer circuit.

Watch the YouTube video:

Watch the video until the end and you will understand Everything. Here I have tested the circuit and the LED Dimmer Circuit Works perfectly. 





Components Used:


  1. NE555 Timer Click Here
  2. 1K Resistor Click Here
  3. 50k Potentiometer Click Here
  4. 1N4007 Diodes Click Here
  5. IRFZ44N MOSFET Click Here 
  6. 100nF, 10nF Capacitor Click Here 
  7. Breadboard Click Here
  8. DOT PCB Board Click Here
  9. 100W LED Click Here



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LED dimmer circuit schematics:



How does the LED dimmer circuit works?

Here we are using 555 timer. You can control the duty cycles of the PWM signal by rotating the potentiometer.   The PWM pulse coming from pin number 3 is driving an N-channel MOSFET. The MOSFET basically dims the LED when it gets slow PWM signal. you can use any engineering MOSFET for any power transistor as per your need. For my case of a LED dimmer circuit, I used IRFZ44N N-channel enhancement type MOSFET. You can use any type of MOSFET as a load you are connecting. I have made the circuit on Dot PCB Board. You can use a breadboard for testing purposes. This is a cheap build which takes all under $1.


NB:


  1. I have mentioned the potentiometer about 10k to 50k. If you find 10k is not working great for you then I will suggest you go for the 50k potentiometer. This will solve your low problem.
  2.  If you want to drive 12 volt LED strips then I will suggest you take a power supply around 13 volts. Because for the dimmer we are using a MOSFET, the MOSFETs has its internal resistance. show the most it will take. 7 volt for its work so when you are working with this type of MOSFETs you will add +0.7 volts For great results.

You may also Like: LED Chaser circuit with 4017





Sunday, 9 December 2018

December 09, 2018

LED Chaser Circuit with 555 timer



Hello, Everyone today in this article we will discuss LED chaser circuit using 555 timer. You can control two LEDs with this circuit. You Can use this circuit for controlling 2 LEDs you can also change the LED flashing speed. You can also control more LEDs by utilization of 2 N-Channel MOSFETs.



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Video Tutorial:

Guys I will highly recommend you to watch my YouTube video about LED Chaser Circuit with 555 timer for more detailed information.




Part Details:

  1. 2 White LEDs
  2. NE555 Timer
  3. 2, 330Ohm Resistor
  4. 100K Resistor
  5. 1K Resistor
  6. 1 DC Capacitor(1,2,3,4....100uf)
  7. 9V Battery
  8. 9V Battery Clip
  9. PCB Board.

Circuit Diagram:




How the circuit works?

  1. The circuit is very simple. you can also make this the number 3 pin is the output pin. Number 3 pin gives the PWM signal which is something about logic 0 and logic 1. Logic 0 means 0 volt and logic 1 means 5 volt. Logic 1 and logic 0 alternates in a fraction of time. I mean if you find that the logic is high then after that the logic will be low after that it will be high and it will go on.

  2. Let's talk about logic 1: The logic 1 and logic 0 is sequential. So was let's talk about logic 1. Logic 1 means 5-volt output. Now if you have read the logic 0 paragraph then you can imagine the logic 1. This is logic 1 so it means that the voltage of PIN 3 is 5 volt. So we can say the middle node voltage is 5 volt. Let's talk about LED 2 first. The middle node voltage is 5 volt and the GND voltages are 0 volt. Show current will flow from the middle node to GND. So we can say the led 2 will run.

  3.  Let's talk about LED 1, let's imagine you have connected the circuitry with 5-volt power supply. Show the Vcc voltage is 5 volt and also the middle node voltages 5 volt so there is no potential difference between these two points so we can say the LED 1 will not work.

  4. This cycle continuous one by one. And the two LED glows one by one.

  5. Here the capacitor takes a great role in switching. Let me explain, the capacity at which you have connected is charging and discharging simultaneously. Firstly the capacitor charges and it comes to a threshold point. The capacitor stores the charge up to the threshold value. When the capacitor crosses it's threshold point then the IC triggers and suddenly the capacitor started discharging. The circle will what till the capacitor fully discharged after that the capacitor fully charged and crossed is the threshold point. And the same circle runs more and more. Here the capacity takes a great part. If you use a capacitor with higher capacity, Then the flashing of the LED will be slower. For this reason, I have used female headers for seeing the changes after changing the capacitor.
      Now you come to the conclusion that we use 555 timer for flashing 2 LEDs. You Can also read the new article about LED Chaser Circuit with 4017 I.C.



mgid

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