LED Blinking Circuit | Using BD139 Transistor NPN

 LED Blinking Circuit | Using BD139 Transistor NPN

In this project, we’ll teach you making an awesome effective dual channel led flasher circuit. Using this circuit you can easily decorate your home, office or other places. It is a very simple and cheap led flasher circuit. It is a transistor make led flasher light.

You can't fast or slow of this led flasher circuit. The both side led will flash in a fixed time later. Since flashing, you can’t adjust the timing of this light.

Since it is a very cheap led flasher circuit, to make this dual channel led flasher circuit, you might need some electronics component. Those component lists with value have to been given below.

Component List 

1. Transistor – BD 139

2. Resistor - 10 KΩ

3. Capacitor - 47µf/ 25v

4.LED

5. Power Supply – DC 12v

6. Soldering Iron

7. PCB (JLCPCB)

Here the led flasher circuit, we design for you, it is a very simple and cheap led flasher circuit. We don’t add power supply circuit, with this led flasher circuit. For power supply circuit, you can use 12v battery or DC-12v adapter circuit. The schematic of LED flasher circuit design along with the PCB layout can be seen below.

We everybody knows that, all kind of transistor contain 3 legs. And all 3 legs have 3 different names. To make this led flasher circuit connection, first we need to know about the pin out of this BD-139 transistor.

BD 139 – BD 139 is an NPN transistor. If we count its leg from left side, then 1st leg “Emitter” 2nd leg “Collector” and 3rd leg “Base”

To make this led flasher circuit, we are using transistor. 1st we connect, one transistor emitter leg with another transistor emitter leg. Now we need to connect other component with the circuit.

Now we connect 10 KΩ resistors with led flasher circuit. We connect this resistor one side empty terminal. Then we need to connect, other two resistor empty terminal with Base leg of transistor.

To flash in a rhythm, we are using 47µf/ 25v capacitor. We connect one capacitor positive leg with one transistor Collector leg and connect capacitor negative leg with another transistor Base leg.

In the same way, we connect another capacitor positive leg with another transistor Collector leg and connect capacitor negative leg with another transistor Base leg.

Since, it’s a led flasher circuit, for that we might need led light. For better effect, we are using two different color led light. We can use maximum 24 pieces leg light to make this flasher light. 1st we make a series connection, so that the light can operate using DC-12v power supply.

Then we connect two color led light positive leg with common leg of 10k resistor. Now we connect, this two different color led negative leg with Collector leg of two different transistors.

To operate this led flasher circuit, we might need power source. We know that, for power source we are using DC-12v power supply. We connect this power supply positive cable with positive leg of LED light and connect DC-12v negative cable with Emitter leg of transistor.

It’s the time to solder and cut-off all extra leg of electronics component. Now we solder all component leg carefully and to make sure we need to check all of them for several times. We also remember that, there should not be any kind of short circuit connection. For perfect inquiry, we should use liquid PCB cleaner to wash PCBs.

Our circuit is now completely ready for use. Now just plug-in power and enjoy the awesome effect of this led light circuit. For better result, you can use this circuit, in a dark place.

 LED Blinking Circuit | Using BD139 Transistor NPN

In this project, we’ll teach you making an awesome effective dual channel led flasher circuit. Using this circuit you can easily decorate your home, office or other places. It is a very simple and cheap led flasher circuit. It is a transistor make led flasher light.

You can't fast or slow of this led flasher circuit. The both side led will flash in a fixed time later. Since flashing, you can’t adjust the timing of this light.

Since it is a very cheap led flasher circuit, to make this dual channel led flasher circuit, you might need some electronics component. Those component lists with value have to been given below.

Component List 

1. Transistor – BD 139

2. Resistor - 10 KΩ

3. Capacitor - 47µf/ 25v

4.LED

5. Power Supply – DC 12v

6. Soldering Iron

7. PCB (JLCPCB)

Here the led flasher circuit, we design for you, it is a very simple and cheap led flasher circuit. We don’t add power supply circuit, with this led flasher circuit. For power supply circuit, you can use 12v battery or DC-12v adapter circuit. The schematic of LED flasher circuit design along with the PCB layout can be seen below.

We everybody knows that, all kind of transistor contain 3 legs. And all 3 legs have 3 different names. To make this led flasher circuit connection, first we need to know about the pin out of this BD-139 transistor.

BD 139 – BD 139 is an NPN transistor. If we count its leg from left side, then 1st leg “Emitter” 2nd leg “Collector” and 3rd leg “Base”

To make this led flasher circuit, we are using transistor. 1st we connect, one transistor emitter leg with another transistor emitter leg. Now we need to connect other component with the circuit.

Now we connect 10 KΩ resistors with led flasher circuit. We connect this resistor one side empty terminal. Then we need to connect, other two resistor empty terminal with Base leg of transistor.

To flash in a rhythm, we are using 47µf/ 25v capacitor. We connect one capacitor positive leg with one transistor Collector leg and connect capacitor negative leg with another transistor Base leg.

In the same way, we connect another capacitor positive leg with another transistor Collector leg and connect capacitor negative leg with another transistor Base leg.

Since, it’s a led flasher circuit, for that we might need led light. For better effect, we are using two different color led light. We can use maximum 24 pieces leg light to make this flasher light. 1st we make a series connection, so that the light can operate using DC-12v power supply.

Then we connect two color led light positive leg with common leg of 10k resistor. Now we connect, this two different color led negative leg with Collector leg of two different transistors.

To operate this led flasher circuit, we might need power source. We know that, for power source we are using DC-12v power supply. We connect this power supply positive cable with positive leg of LED light and connect DC-12v negative cable with Emitter leg of transistor.

It’s the time to solder and cut-off all extra leg of electronics component. Now we solder all component leg carefully and to make sure we need to check all of them for several times. We also remember that, there should not be any kind of short circuit connection. For perfect inquiry, we should use liquid PCB cleaner to wash PCBs.

Our circuit is now completely ready for use. Now just plug-in power and enjoy the awesome effect of this led light circuit. For better result, you can use this circuit, in a dark place.