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Circuit 166 to 169: By means of the FET input level or a Darlington pair amplifier, a DC amplifier with very
high input resistance is implemented. Exposed to stressful situations the surface of our skin becomes moist.
This circuit detects the significant change in resistance easily.
Fig. 3.168: Circuit 168 –FET lie detector with LED
indicator
Fig. 3.169: Circuit 169 –FET lie detector with
moving-coil instrument
313
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