Velleman Polygraph Electronics Soldering Kit
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- Velleman MadLab Polygraph Electronic Soldering Kit
- It works by measuring the current response
- Power supply: 9V battery
- The Polygraph Electronic Soldering Kit works by measuring the current response. In other words, if you lie, you sweat. Sweat is high in sodium, which makes it a good conductor of electricity. Dry skin has a resistance of about one million ohms, but wet skin has a resistance that is ten times lower or more.
- The person holding the probe wire will change the voltage on the upper probe wire based on their skin resistance. Since the skin resistance is in parallel with R2 and can be similar or smaller than R2, a decrease in skin resistance will result in a decrease in voltage on the probe wire.
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