Touch Sensor LED

Introduction: Touch Sensor LED

touch sensor LED is a simple led circuit. the led switches on when we touch the two terminals of the wire

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Step 1: Parts List

1 x  2N3904 transistor or any other npn transistor
1 x   470r resistor ( yellow violet brown)
1 x   330uf capacitor
1 x  LED ( 3v ,any colors you like)
1 x 9V battery 

Step 2: Steps

complete the circuit according to the circuit diagram, it so simple , the total circuit is less than 3cm in scale

Step 3: Conclusion

have fun with this circuit,  

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    8 Discussions

    0
    batvanio
    batvanio

    1 year ago

    And can it work with a 3 volt battery of those who take a pill? That's more compact.

    0
    Bits4Bots
    Bits4Bots

    5 years ago on Introduction

    https://www.instructables.com/id/Simple-Touch-Switch-3904-NPN/

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    0
    Alexander.k
    Alexander.k

    6 years ago on Introduction

    U can actually make it a lot better single touch a pin just add another NPN transistor like the one you used in the touch corner the upper touch schematic wise goes to (E) the (B) is the single touch and (C) is the output to the cicle. have fun :P

    0
    thewestafrican
    thewestafrican

    Reply 6 years ago on Introduction

    i really want to try your version of the circuit. could you draw it out or explain it so someone with less experience could understand?

    0
    Bits4Bots
    Bits4Bots

    Reply 5 years ago on Introduction

    https://www.instructables.com/id/Simple-Touch-Switch-3904-NPN/

    0
    Robot Lover
    Robot Lover

    8 years ago on Introduction

    I recently made the same thing. I was using a capacitor, transistor and resistor at first, but i managed to limit it to just a transistor!

    0
    vishalapr
    vishalapr

    8 years ago on Introduction

    This is marvelous !
    Rated 4.5*, Have a look at my ibles as well!