a simple blinking LED circuit is a very basic yet very useful circuit. Blinking LEDs are often used in a wide range of Electronics projects from simple toys to gadgets, generally their blinking and flashing are programmed on a micro-controller or some kind of timer IC’s.
The LED flasher can be used to create a visual state indication, provide a warning signal or simply to add some stylishness to a project. The best thing is that creating a simple blinking LED circuit is relatively easy, even for those who are new to electronics and DIY.
In this article we will be discussing the basics of LED flasher circuit diagrams, including all the required components, the circuit schematic and programming if any. We will also provide step by step instruction on how to create your own Blinking LED circuit along with a few useful tips and tricks to help you get the most out of your project. Whether you are an occasional electronics enthusiast or just starting in this field, this article will provide you all the information you need to create your own LED flasher circuit and take your projects to the next level.
The above image shows two red and blue indicators in and as a 555 timer blinking led circuit. This is a very simple blinking LED circuit consisting of only 5 components (except LEDs and battery). Strobe effect can be replicated with this circuit as it alternates red/blue color kinda cool though.
Its simplified connection is shown in the circuit diagram in two illustrations. You can solder it on a small compact PCB and make it portable/ versatile. Always check the polarity of the light emitting diode if anode and cathode are connected properly (incorrect polarity of LEDs is one of the most common errors).
The above circuit design implemented the design of the blinking LED with the help of timer IC 555. Out of three operation modes viz, astable mode, monostable mode, bistable mode. Here we have used the 555 timer IC in an Astable configuration.
Astable mode of operation gives two digital levels at the output, that is the output voltage will swing from high and low and low to high at regular intervals determined by RC network. This character of the astable output is used as a clock or square wave generator in various electrical circuits.
The duration of ON/ OFF is the duty cycle of the output square wave generated which can be changed by changing the value of the tank circuit. Also IC555 works with a wide range of voltage supply from 5V to 18V up to 200mA of load current.
All the All the circuit below uses a general purpose transistor so you can use any general purpose transistor available in your electronics project kits, you can use general transistors like BC 547 or 2N3904, BC 557, 2N2222, 2N2907 BC548,BC547. Please note that you can not substitute an NPN transistor with a PNP.
This circuit only uses the transistor’s Collector-Emitter terminal, keeping the Base terminal open. That circuit looks to be technically incorrect, however the above circuit diagram shows that even with just one transistor as the main component, you can create a working single LED flasher circuit. The circuit utilizes the negative resistance area in transistors to produce the blinking effect.
It is possible to change the flashing rate by changing either R11 or C4 or both together, but supply voltage must not be less than 9V otherwise the circuit does not work.
This circuit is very efficient and works only on as low as 1.5volts of supply, as this consumes current in the range of mAmps it lasts for very long without need to change the battery. You can power this circuit even with 3 volts and it would work fine.
3.7V/ 5V Blinking LED circuit using transistor
This is the tested and 100% working circuit of 3v LED flasher circuit, it utilizes a cross coupled transistor switching circuit as an astable multi-vibrator, but with lesser components than that of above which works on lower voltages like 3 volts and 5 volts.
Blinking LED circuit using transistor in Astable Multivibrator mode
This circuit is made possible using the regenerative switching circuit. The circuit shown below is called an Astable Multivibrator design using two transistors. Astable Multi-vibrator are the most commonly used type of relaxation oscillator due to not only they are simple, reliable but also very simple to build. Also produces a constant square wave output signal which is used here in a bc547 led flasher circuit.
a simple blinking LED circuit is a very basic yet very useful circuit. Blinking LEDs are often used in a wide range of Electronics projects from simple toys to gadgets, generally their blinking and flashing are programmed on a micro-controller or some kind of timer IC’s.
The LED flasher can be used to create a visual state indication, provide a warning signal or simply to add some stylishness to a project. The best thing is that creating a simple blinking LED circuit is relatively easy, even for those who are new to electronics and DIY.
In this article we will be discussing the basics of LED flasher circuit diagrams, including all the required components, the circuit schematic and programming if any. We will also provide step by step instruction on how to create your own Blinking LED circuit along with a few useful tips and tricks to help you get the most out of your project. Whether you are an occasional electronics enthusiast or just starting in this field, this article will provide you all the information you need to create your own LED flasher circuit and take your projects to the next level.
The above image shows two red and blue indicators in and as a 555 timer blinking led circuit. This is a very simple blinking LED circuit consisting of only 5 components (except LEDs and battery). Strobe effect can be replicated with this circuit as it alternates red/blue color kinda cool though.
Its simplified connection is shown in the circuit diagram in two illustrations. You can solder it on a small compact PCB and make it portable/ versatile. Always check the polarity of the light emitting diode if anode and cathode are connected properly (incorrect polarity of LEDs is one of the most common errors).
The above circuit design implemented the design of the blinking LED with the help of timer IC 555. Out of three operation modes viz, astable mode, monostable mode, bistable mode. Here we have used the 555 timer IC in an Astable configuration.
Astable mode of operation gives two digital levels at the output, that is the output voltage will swing from high and low and low to high at regular intervals determined by RC network. This character of the astable output is used as a clock or square wave generator in various electrical circuits.
The duration of ON/ OFF is the duty cycle of the output square wave generated which can be changed by changing the value of the tank circuit. Also IC555 works with a wide range of voltage supply from 5V to 18V up to 200mA of load current.
All the All the circuit below uses a general purpose transistor so you can use any general purpose transistor available in your electronics project kits, you can use general transistors like BC 547 or 2N3904, BC 557, 2N2222, 2N2907 BC548,BC547. Please note that you can not substitute an NPN transistor with a PNP.
This circuit only uses the transistor’s Collector-Emitter terminal, keeping the Base terminal open. That circuit looks to be technically incorrect, however the above circuit diagram shows that even with just one transistor as the main component, you can create a working single LED flasher circuit. The circuit utilizes the negative resistance area in transistors to produce the blinking effect.
It is possible to change the flashing rate by changing either R11 or C4 or both together, but supply voltage must not be less than 9V otherwise the circuit does not work.
This circuit is very efficient and works only on as low as 1.5volts of supply, as this consumes current in the range of mAmps it lasts for very long without need to change the battery. You can power this circuit even with 3 volts and it would work fine.
3.7V/ 5V Blinking LED circuit using transistor
This is the tested and 100% working circuit of 3v LED flasher circuit, it utilizes a cross coupled transistor switching circuit as an astable multi-vibrator, but with lesser components than that of above which works on lower voltages like 3 volts and 5 volts.
Blinking LED circuit using transistor in Astable Multivibrator mode
This circuit is made possible using the regenerative switching circuit. The circuit shown below is called an Astable Multivibrator design using two transistors. Astable Multi-vibrator are the most commonly used type of relaxation oscillator due to not only they are simple, reliable but also very simple to build. Also produces a constant square wave output signal which is used here in a bc547 led flasher circuit.
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