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Simple Lie Detector

Discussion in 'Electronic Projects' started by ElectroMaster, Jul 19, 2002.

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  1. ahya

    ahya New Member

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    question

    hi! how accurate is this project? i just want to know because we will defend this project and can you give me some documentation about this projects... it so cool.. thx anyway...
     
  2. audioguru

    audioguru Well-Known Member Most Helpful Member

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    A digital ammeter might need a battery to power it that is separate from the battery in this circuit.
     
  3. ahya

    ahya New Member

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    hi! i just need to know how accurate this project is and can someone give me documentation about this project, i really need it badly...
     
  4. dave

    Dave New Member

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  5. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    It's not at all accurate, lie detection is a very complicated subject, and not terribly accurate anyway!.
     
  6. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The project shows resistance changes, not lieing.
    Some people get nervous and sweat when they lie. Then their skin resistance becomes lower. Other people don't sweat when they lie so then the project is useless.
     
  7. ahya

    ahya New Member

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    thanks for answering my question but can any1 post a word doc about this project? thanks in advance...
     
  8. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Why post a Word Doc?
    It is a simple ohm-meter.
     
  9. Roff

    Roff Well-Known Member

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    A Word doc makes it really easy to turn it into a report for a school assignment. ???
     
  10. blueroomelectronics

    blueroomelectronics Well-Known Member

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    What are you defending it from?
     
  11. Hero999

    Hero999 Banned

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    Too, easy, change the name, print it off and there you go.
     
  12. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Why would little kids want to play with this simple circuit?
    Why would anybody want to play with this stupid and simple circuit??
     
  13. Hero999

    Hero999 Banned

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    Is it so bad if it gets people into electronics?

    I don't mean to sound like that old fart of a moderator on the other forum but please don't discourage people.

    I agree that this circuit is crap but we need silly circuits like this to get people started off. I'd rather someone attempt to build something like this for their first project rather than attempting something truely silly like a 3kW inverter or just beyound their level of understanding like a random number generator without a microcontroller when they don't even know you can power a radio that requires 12V@100mA from a mains adaptor that can 500mA, without a series resistor.
     
  14. audioguru

    audioguru Well-Known Member Most Helpful Member

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    My first few electronic projects were kits. An FM tuner, a stereo multiplex adapter for the FM tuner, an audio amplifier and an oscilloscope.

    Then I made a Wien Bridge sine-wave/square-wave generator from the project in a magazine. They all worked well.

    I made a transistorized voltmeter that didn't work well. Something like this lousy lie detector circuit.
     
  15. Krumlink

    Krumlink New Member

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    My first electronics project was a alternating flasher using the 555. That's becuase the 555 was around when I Started :D Old farts (Im joking, I bow to your superiority).

    I then made a inverter oscilliator that then made a dual LED flasher and that was in turn controled by light. I brought it to school and People thought it was a bomb.

    Another was A high frequency oscilliator (555 again :)). I would turn it up as High as it could go and People would be freaking out because Only a couple could hear it and nobody believed them. AWESOMEST DAY EVER!

    I then brought Spaghetti to school, and that wasted all day. It was really fun watching the teachers asking what voltage is, amperage is, wattage and stuff. Most of those teachers were crap, only teaching what they could read out of a book.

    :)
     
  16. HiTech

    HiTech Well-Known Member

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    My first project was a D cell, a lightbulb and some hook up wire! I took it to the dinner table with me while I ate! From there I got one of those 200 in one kits and then it was off to the big times: Heathkit HW-101 100 watt SSB transceiver!!
     
  17. AND_ECE

    AND_ECE New Member

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    oh wow what a nice design!!!! for mw cos am a 1st timer of this field
    what bout a buglar alarm consisting a transistor
     
  18. chir

    chir New Member

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    this ckt is good but i knew this ckt befor itself
     
  19. HiTech

    HiTech Well-Known Member

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    ^^^^^:confused: :confused: :confused: ^^^^^^
     
  20. kingkoi

    kingkoi New Member

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    help me sir

    I have gathered all materials for this Simple Lie Detector.

    Except for 0-1 mA Analog meter, it is not available in our place.

    All they have are 20mA Analog meter. But I will still try to find 0-1 mA.

    To all of you Sir, i would like to know what would be the appropriate replacement for the 0-1 mA analog meter.

    Thank you sir..
     
  21. Hydrogenboy

    Hydrogenboy New Member

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    Hey,
    I have read that some of you think that this project is stupid, and I know that I can/have done better than this, but I just want to make a Lie thingy, because I never know when someone is lying. So, I think I have found all the parts, but I just want someone to make sure they are the right ones.

    • Analog Meter
    http://www.thesourcecc.com/estore/product.aspx?language=en-CA&product=2211323&category=Multitesters&catalog=Online&tab=3#more

    • Transistor
    http://www.thesourcecc.com/estore/Product.aspx?language=en-CA&catalog=Online&category=Semi+Conductors%2fIC's&product=2761617

    • Capacitor
    http://www.thesourcecc.com/estore/P...og=Online&category=Capacitors&product=2720802

    • Resistors
    http://www.thesourcecc.com/estore/P...log=Online&category=Resistors&product=2719018

    Pot
    http://www.thesourcecc.com/estore/P...Online&category=Pots/Controls&product=2711720


    I believe this is all that I need to buy, I might have the Resistors, if I looked hard enough, but I want to make sure these items will work. Will they? Thanks.
     
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