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 Make Your Own Lie Detector

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Hawkeye
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Number of posts : 127
Registration date : 2009-03-03
Age : 26

PostSubject: Make Your Own Lie Detector   Thu Apr 02, 2009 10:30 pm

Is your friend lying to you? Build this Lie Detector and find out the truth!

Parts You'll Need




Parts you will need...These should all be pretty easy to find.

1. Project Enclosure
2. 4.7K Resistor
3. 82K Resistor
4. 0.01uF Capacitor
5. 2N3904 Transistor
6. 2N3906 Transistor
7. 2-AA Battery holder
8. Small circuit board
9.Spare PC speaker
10.Velcro
11. Aluminum foil
12. Wire
13. AA Batteries

Basic Tools

You will need a soldering iron/station, solder, screwdriver, hot glue, small drill bit and wire strippers.

Build the Circuit




Following the schematic shown here, build the circuit. Take your time and make good solder joints.

Make the Finger Pads

Install everything in the project enclosure leaving just the Finger Pad leads exposed through drilled holes.

Using a strip of Velcro (soft side), cut a piece of aluminum foil the size of the Velcro. Make sure the Velcro is long enough to go around a big, fat finger. Some liars are chubby. Remove the sticky side of the Velcro and attach the aluminum foil with one of the Finger Pad leads under the aluminum. Then use a smaller piece of the other part of the Velcro (the 'hook' side) and attach it to the end so the whole pad can be wrapped and secured.

Test it Out



This works on the galvanic skin response.

When you lie, your skin becomes moist. While this does work, it's not as accurate as a true Polygraph machine.

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Arijit
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Number of posts : 422
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PostSubject: Re: Make Your Own Lie Detector   Thu Apr 02, 2009 10:48 pm

Dude this is amazing. Children should do this as a school project rather than doing some stupid ones.

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pheonix fury
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Number of posts : 24
Registration date : 2009-03-14
Age : 26
Location : Kerala

PostSubject: Re: Make Your Own Lie Detector   Fri Apr 03, 2009 5:44 pm

i am actually thinking of taking this as my physics project............
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