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capacitive touch sense

Discussion in 'General Electronics Discussion' started by qweets, Oct 8, 2010.

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  1. qweets


    Sep 26, 2010
    hello : )

    i wonder if anyone can help? i've been trying to solve this for two days with minimal success.

    i am trying to make a touch sense circuit, so when I touch or go near a wire or metal touch plate a logic out is created from it.

    i made a simple little circuit a few weeks ago with a couple of transistors it was very effective indeed, i did not even have to physically touch the wire for it to work ( not sure if it was a 2n7000 or a 2n2222?) but I just can't seem to replicate it, no matter how hard i try.: /

    i wonder if anyone knows of a simple circuit that can do this? i am sure many of you have had the funny experience when you are building on a breadboard and you go to put your hand near a wire and one of the led's begins to get brighter. : )

    i am finding it so hard to replicate that circuit.

    any help would be great
    thanks : )

    p.s i tried a monostable 555 timer , it works o.k the touch is not very sensitive and as it loops the 5v logic out flickers 'off' very briefly. i tried to fix this with a capacitor, but i am still experimenting on this.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Doesn't get much simpler than this.
  3. qweets


    Sep 26, 2010

    I tried to find one available for order but no luck so far, that is a great find though thanks Steve : ) . i wonder if the package will fit my breadboard? or an adaptor would be needed?
    i am only slightly experienced with electronics. so lots to learn.

    thanks for any help on this guys.
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