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Monday, 31 December 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 😀

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