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How a Transistor works

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Uploaded by on Jul 7, 2010

9 volt battery + NPN transistor (BC172A) + Bright LED + Finger

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Science & Technology

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Standard YouTube License

  • likes, 13 dislikes

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Uploader Comments (furulevi)

  • short and sweet ... nice video ... but let say you want some sound reactive led where would you connect the + and the - on that circuit ..thanks

  • @GHOSTTOYS ;-? :-?? :D

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All Comments (9)

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  • It's very nice. But an educational addition would be to show the schematic representations as you go, and then the completed schematic.

    I subscribed immediately.

  • wow you should be a teacher!!!!

  • @AcousticBruce i think , yes .. but the finger is a small signal and microphone got more .. i have search every where for a simple sound reactive circuit , the smallest possible but nothing efficient and i dont know enought in electronic to etch my hown circuit from scratch , i was needing that circuit for a psp ... or a nintendo ds and all the circuit i tryed left the led on and pulsate it but me i want it to be off and then activated (no white noise reaction)

  • @GHOSTTOYS you mean with a microphone instead of his fingers?

  • =)

  • Damn this makes me want to go back and do science at school.I always was a geek lol.

  • @GHOSTTOYS if you want it to be sound reactive you would connect the + of the audio signal from sound card to the base of the transistor and the ground of the signal to battery ground :)

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