LED Flasher Circuit Using BC547 | The Simplest

This led flasher uses a transistor bc547, a 4700uf capacitor and a 1k ohm resistor.. The blinking time can be adjusted by increasing or decreasing the value of the capacitor.

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#LedFlasher #BlinkingLed #BC547transistor

[Erated]

Thank you I appreciate that you kept it simple - I have everything needed to make this except a 12v battery. Cheers

[davezallenzkie]

im trying to learn at a basic level . i notice te base leg of transistor is Not connected t anything, IS tis possible?

[tomference]

Nice..., now can a traditional rotating beacon led be achieved?

[Ruzgar_K_]

Hello there. Would it be a 22 microfarad capacitor?

[syedzulqarnain]

What is source of supply? Battery or ACDC

[florinpetrache]

what is the current of your source?i can use a 9v batery?

[yvesmuhlheim]

Thats great. What do i have to do to Make it Fade soft on and off, sir?

[bajlurrahaman]

Bhai 5v charger se 5mm led blinking keise koreana circuit batao please

[mathyscjansevanrensburg]

I can't get this "project" to work. When I remmove the power and then the LED and press the LED back it gives one flash and even when power is applied it doesn't do anything at all. I even tried older LED's and the effect is exactly the same.

[orewanaru]

Thank You
it worked for me 😊
👍👍👍👍👍👍

[jjjnathan]

can change the resistor to control speed of blinking. thanks, this was the simplest working led flasher / blinker with BC547, i used 470 uf capacitor,

[RC-Heli]

How wide is the range of voltage this guy will flash with? Thanks!

[vihangarashmitha]

what risister we can put if we using 3.7v battry

[bangkeh]

itu lampu led nya, pakai led yang stanby atau led yang kedip dari pabrik

[sujitverma]

Can it use in activa as flasher, if yes pls tell how to connect, there is only 2 wire. 1 coming fm battery and 2nd goes to load

[akkonartbishalsarkhel]

Can I use this circuit on AC 220volt? If not how to possible use this circuit on AC220volt? Please help me for solving this problem.

[budisantosa]

Ki tegangannya berapa kok ga dijelasin..3.7v.ato 12 volt

[mohammadfahriansyah]

The circuit above is very unreliable and only works with some transistors. The voltage is very important. It must be high enough to cause the junction(s) between the emitter and collector leads to breakdown.
The flash-rate will depend on the value of the top resistor and the electrolytic and also the voltage at which the transistor break-down.  The circuit consumes less than 1mA and the 100R prevents a high current flowing through the LED (from the electrolytic). Without the 100R, the LED is destroyed instantly. 
The circuit is a very good demonstration of breakdown but due to the high supply voltage needed, it is not a practical design. The previous circuit should be used.