Led flash for alerts – led blinking using transistor bc547

The Led flash for alerts – led blinking using transistor bc547, you heard about these word in anywhere. because the flashing or blinking led is using in automobiles, signal tower, and other electrical and electronic devices.

In most of the motorcycle, the backlight is made up of led. when we applying the brake the led starts to blinking to giving as alert information.

so in this article, I’m going to explain how to build a led flasher. The free PCB you will get from the bottom of this site. This circuit is working based on the two transistors. This two-transistor LED flasher circuit is easy to build. so follow every step and learn about how to make your own led blinking circuit.

Circuit diagram of LED flasher/Blinker

led blinking using transistor bc547

The circuit contains two transistors.

• BC 547 NPN transistor
• BC 557 PNP transistors

These two transistors are the main components for this circuit. The base of the PNP transistor connected to the collector of the NPN transistor. And also Base of the Npn transistor connected to the collector pin of PNP transistor.

so this circuit will act as a low switching function. First, the PNP transistor Get activated and led goes to glow and the NPN transistor drives the voltage to on PNP transistor.

Then the cycle will be continued and the led start to flashing at each time of the switching occurred in the transistors.

The working voltage of this circuit is 9v dc supply. you can also apply 12v dc without any problem.

Components for Led flash for alerts

• BC547 transistor – 1
• BC557 transistor – 1
• led
• 1m ohm resistor
• 1 uf 25v capacitor
• 9-12v battery

The led flasher PCB layout

Application of led flasher circuit

• you can use it on your bike as a brake signal
• using for decoration
• alert message
• boundary separation
• hobby electronic circuit
• you can use ut on your charger circuit ( Check how to use it )
• in amplifier power-on indicator
• cut off circuit
• alert message
• alert notification.