in this article i’m sharing detailes about how to build Led flasher circuit for alerts. This led blinking circuit uses BC547 transistor. 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.
You can download the PCB layout at the bottom of this article. 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
Working
The circuit contains two 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 Required
- BC547 transistor – 1
- BC557 transistor – 1
- led
- 1m ohm resistor
- 1 uf 25v capacitor
- 9-12v battery
PCB layout
Application of led flasher
- 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.
Hi,
how to adjust the circuit by adding a photoresistor to start working in low light? (evening, night)
Thx, Luigi.
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