313
Fig. 3.168:
Circuit 168 –FET lie detector with LED
indicator
Fig. 3.169:
Circuit 169 –FET lie detector with
moving-coil instrument
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.
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
