Data Sheet

45 Light on, sound on 46
46 Light off, sound on 46
Electricity: stored in the smallest of spaces 47
47 Charged with electricity 47
48 One-second electricity supply 48
49 Small charges made visible 48
On stopwatches and timers 49
50 Stairway light 49
51 Stairway light with sound switch 50
52 Timer 50
53 Timer with sound change 51
54 Timer with phototransistor control 51
55 Light-controlled stairway light 52
56 First green, then red 52
Flip-flop: a circuit with a memory 53
57 Alarm system with memory 53
58 Flip-flop with red and green 53
59 Optical alarm system with memory 54
60 Alarm with invisible light 54
Flasher, tapper, buzzer 55
61 Green flasher 55
62 Crackling and purring 56
63 Adjustable sound pitch 57
64 Light-controlled flasher 57
65 Light-controlled noisemaker 58
Logic gates: AND, OR, NOT, in electronic language 59
66 A circuit for addition 59
67 Double sound protection 59
68 OR gate 60
69 A circuit in denial 60
70 AND-NOT gate 61
71 OR-NOT gate 61
72 Smart alarm system 62
73 Double security 62
Science Database Boxes
Electrical current and electronics 11
Plus and minus 12
In what direction does current flow? 13
Voltage and current strength 14
Morse code 15
Conductor, nonconductor, semiconductor 17
Light-emitting diodes & Resistors 19
Wiring symbols 21
How electrical valves work 22
The transistor as a switch 29
What’s going on inside a transistor? 31
Phototransistor 35
Infrared light 36
Transistor as amplifier 39
Capacitors 47
Frequency & Monuments to the pioneers of electricity 56
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