Thursday, December 8, 2011

Simple Led Flashing Circuit - Sponsored by Farnell.com

You like playing around with Leds? Then build a simple Led flashing circuit!


You want more? Read more after the break!
This post was sponsored by Farnell.
I got all the parts I needed from www.farnell.com. Check out the links next to the components!

The capacitor value isn't critical. A lower value will result in faster oscillation and shorter flashes. The 2N2222 NPN transistor seems to work reliably in this circuit. Other transistors may be more temperamental, and others might not work at all. 

This is the circuit:
 


After soldering everything together it should look like this:


And here's a little video where you can see the Led flashing with a high frequency:
video

17 comments:

  1. Wow, amazing blog structure! How long have you been blogging for? you make blogging glance easy. The overall look of your site is great, as well as the content!

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  3. Thanks for announcement this advisory article.

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  4. what is Capacitor 330 uf but value ? 330 uf 25v ? 30v ? how many voltage for capacitor ?

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  5. I have tried the circuit above but why isn't it flashing? What must gone wrong?

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    Replies
    1. what kind of LED should i use?

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    2. Hi, does your LED turn on permanently but not flashing?? I got mine ON permanently without flashing too. Help anyone??

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  6. can i use 10leds ? if can how they connect? jaya19995@gmail.com

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  7. why is the base not connected to any?

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  8. This comment has been removed by a blog administrator.

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  9. is this circuit is working in low voltages.

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  10. I don't understand how does the circuit work.There is no conection to the 2N2222's base. Does the circuit need at least 12 volts, or it can work with smaller voltages (about 3,6,9V)?

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  11. The 2N2222 is NPN type and I can see that the emmiter lead is connected to the POSITIVE RAIL! And the collector is connected to the 0V RAIL! Doesn't this destroy the transistor?

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