266
Fig. 3.54:
Circuit 54: Light
sensitive switch with solar
cell
Fig. 3.55:
Circuit 55: Light
sensitive switch phototran-
sistor
Circuit 54: The solar cell delivers no current while it is dark, T1 and T2 are blocked. LED1 remains dark. The
solar cell converts light into electricity, which in return puts T1 and T2 in the conductive state and LED1 turns
on.
Circuit 55: The functioning principle is described on page 265.
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...
