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We've had a few emails and posts about folks who wanted to build their own lie detector, here's one (and how it works) - "The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1). Suitable transistors to use are BC547, BC548 or BC549, or any other small NPN transistor. The Lie Detector circuit works based on the fact that a person's skin resistance changes when they sweat (sweating because they're lying). Dry skin has a resistance of about 1 million ohms, whereas the resistance of moist skin is reduced by a factor of ten or more." Link.
Lie Detector Electronic Kit and Circuit Explanation
We've had a few emails and posts about folks who wanted to build their own lie detector, here's one (and how it works) - "The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1). Suitable transistors to use are BC547, BC548 or BC549, or any other small NPN transistor. The Lie Detector circuit works based on the fact that a person's skin resistance changes when they sweat (sweating because they're lying). Dry skin has a resistance of about 1 million ohms, whereas the resistance of moist skin is reduced by a factor of ten or more." Link.
Posted by Phillip Torrone |
Jan 19, 2006 04:14 PM
DIY Projects, Electronics, Kits, Science, Toolbox |
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Where do we get the parts to build it.
What parts do we need.
How much do they cost and make sure there for kids.
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