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Electronics Would a 'touch lamp repair kit' make a servicable touch start thingy?

Discussion in 'Modding' started by disco volante, 21 Jul 2003.

  1. mod-ern man

    mod-ern man What's a Dremel?

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    Cool, do I smell a how to coming up?
     
  2. viridius

    viridius What's a Dremel?

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    Power can come from anywhere provided that it is 5 volts. The transistor can be any NPN small signal transistor such as a 2N2222 or a 2N3904. I help teach an electronics class at a museum. I asked for 5 of the QT113Hs to see if they would be good for general use. A few days later, 50 arrive.
     
  3. apoogod

    apoogod trix arent just for kids

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    Sorry to quote myself but I need this answered if possable. Thanks

    Also do they make these for 12v...I didnt see any
     
  4. apoogod

    apoogod trix arent just for kids

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    will this work for the electrode ....Transparent Electrical Film [​IMG]
     
  5. viridius

    viridius What's a Dremel?

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    No, you need to use 5 volts. You also need to connect a capacitor between pins 6 and 7 and tie pins 3 and 4 to ground or 5 volts depending on what functions you want. Where did you find that electrical film at?
     
  6. apoogod

    apoogod trix arent just for kids

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  7. apoogod

    apoogod trix arent just for kids

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    Ok how would I do this....where would I hook up the LED lines and is that ok where the resistor is? thanks


    [​IMG]
     
  8. malcs

    malcs oops! i put a hole in the ***** :(

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    Where do you get that transparent electrical film!?!?!? it is just what i need for my clear traces!!!
     
  9. apoogod

    apoogod trix arent just for kids

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  10. viridius

    viridius What's a Dremel?

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    Depends on what you want to do. A 0.01 capacitor goes between pins 6 and 7. The LEDs go between pins 2 and 8. If you want the sensor to turn the LEDs on when a finger is touching the plate, then tie pin 3 low and 4 high. If you want to have the LEDs turn on and stay on until the next time someone touches the plate, tin pins 3 and 4 low. Gain is determined by pin 5. Tie it low for low gain, high for high gain. (Low refers to ground/earth, high refers to +5 volts.)
     
  11. apoogod

    apoogod trix arent just for kids

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    Ok you lost me, remember I have the brain of a 5yr old. Whats the .01 capacitor? I want the LEDs to be turned on and stay on till some1 touchs it again. Thats pretty much it. What do u mean by tie it to low or high? thanks sorry for the noobish questions.
     
  12. viridius

    viridius What's a Dremel?

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    The 0.01 microfarad (uF) capacitor goes between pins six and seven and determines sensitivity. If you put a 0.1 microfarad capacitor between pins six and seven, the switch would activate before you actually touched the pad. Upon further inspection, the clear conductive film may not work with this application, although you're welcome to try and post your findings. Pin 2 goes to LED + and earth/pin 8 goes to LED -. For your application, connect pins three and four to earth and connect pin five to +5 volts.
     
  13. apoogod

    apoogod trix arent just for kids

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    tx viridius....the resistor is in the right place right? Also I take it soldering is the best solution for connecting the wires? Thanks


    oh ya...do they make 12v of these I didnt see any but I could of missed it?
     
    Last edited: 2 Aug 2003
  14. viridius

    viridius What's a Dremel?

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    The resistor is fine where it is. Position isn't an issue. I haven't seen 12 volt flavors of the QProx sensors, but you can just run them off of the 5 volt rail or buy a 7805 or some other voltage regulator IC.
     
  15. apoogod

    apoogod trix arent just for kids

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    ya I have some 12 auto LED kits and I would love to hook those up to the touch switch. Thanks for the help
     
  16. apoogod

    apoogod trix arent just for kids

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    Sorry just thought up another question....for the capacitor could I just use any type of metal? Would aluminum foil?
     
  17. viridius

    viridius What's a Dremel?

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    You can use aluminum foil or any sort of metal for the touch plate, if that's what you're asking. For the capacitor, you will have to use a premade one. They're cheap.
     
  18. apoogod

    apoogod trix arent just for kids

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    got a link? :)
     
  19. viridius

    viridius What's a Dremel?

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    Digikey is good, but they have a $25 minimum order. Radioshack should have it for a buck or so.
     
  20. apoogod

    apoogod trix arent just for kids

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    ok now I know I hate soldering.....theres got to be a easyer way
     

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