291
Fig. 3.116:
Circuit 116 – On button
with sensor
Fig. 3.117:
Circuit
117 – Off button
with sensor
Circuit 116 and 117: The FET transistor (T1 in the circuit) has a very high input resistance. Thus the very low
conductivity of human skin is enough to turn on the transistor when the sensor surfaces are touched with a
finger.
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...
