2 Transistor LED Flasher

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Uploaded by on Apr 5, 2010

This is a LED flasher using 2 NPN2222ag transistors. This makes 2 LEDSs flash once about every 2 seconds. Parts: 2X NPN222ag transistors, 2X LEDs any color 1-5v, 2X37k resistors, 2X 470 ohm resistors, and 2X 10uf capacitors. Very fun to make. Parts are available to buy at mouser.com for under 3$ excluding shipping. Thanks for watching! Enjoy!

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Education

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Uploader Comments (winkchristian)

  • Isn't the annode (positive end) the longer lead?

  • @borisj87 It depends on the type of LED. Mostly the positive annode is the short leg of the LED but I have seen them the oppisite of that.

Top Comments

  • It doesn't matter which end of the resistor is connected to positive or negative. They aren't polarized like capacitors..

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All Comments (19)

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  • @winkchristian in australia its the longer one but it depends where there made... i think!

    but the side with the flat bit is the negetive..

  • Is it possible to make transistors out of LEDs?

  • OMG I've never seen so much wire on a simple circuit like that!

  • can you gave me the diagram of it..pls..i want to make one pls...!

  • @DJPaulgee1 haha

  • @ChiIdKiIIer yeah, sorry!!!! My mistake. I was tired when i saw the post and wasn't concentrating. My apologies.

  • @DJPaulgee1 no you idiot, i'm asking to asuma1105 what is the power source he or she wants to use in his or her 50 led light of 25 inches.

  • @winkchristian Rubbish!!!! All led's are the same. Don't confuse people.

  • @ChiIdKiIIer did you not watch the video??? The power source is a battery. Duh!!!!

  • Firstly l have to say you don't connect the resistors in parallel to the led, it's connected in series, also, you say connect the brown end of the resistor to the positive or whatever it is you said? It doesn't matter which way round any resistor is connected because they are not polarized

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