Simple Led Flashing Circuit – Sponsored by

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 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:


  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!

  2. 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)?

  3. 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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