D
Daisywheel printers
275
Damping resistors
73–4
Data bus
91–2 , 244 , 250–3 , 259 , 263–4
block diagrams
91–2 , 244 , 263–4
definition
251
Daughter boards
see alsoPrinted circuit boards
definition
81
dbx
132
DDD symbols on CDs
171
DDR3
251
De Forest, Lee
128
Decibel scale
67–71 , 88 , 120–1
Decision tables
seeTruth tables
Decoders
198–201 , 244–6 , 264–5
see alsoDemultiplexing
definition
198 , 201 , 264
DECT standard
321
Deflection plates
147–9
Degaussing circuit
86
Delays, color television analog circuits
163–5
Demultiplexing
198–201 , 216
see alsoDecoders
Denary numbers, binary systems
167–8
Desktop computers
281–95
see alsoComputers
definition
281 , 283
Deviation of the carrier, definition
105
Diagrams
see alsoBlock… ; Circuit…
component layout diagrams
79–80
computer-assisted drawing
80
concepts
23 , 79–93
definition
79
PCBs
80–2
Dial-up modems
267–8
Differentiated (spiked) waveforms
21–2 , 34–5 , 152–4
Digital audio broadcasting (DAB)
concepts
105 , 116 , 217 , 241 , 307–9
definition
307–8
Digital audio tape (DAT), low impacts
128 , 136 , 170 , 306
Digital broadcasting
73 , 105 , 111 , 116 , 169 , 171–3 , 183 , 223 , 297–309
see alsoCable… ; Digital radio ; Digital television ; Satellite… ; Terrestrial… ; Transmitters…
advantages
171–3 , 183
COFDM
304–5 , 309
definition
171–2 , 301
Digital circuit blocks
90–2
Digital circuits
22 , 50 , 51–2 , 53 , 54 , 56–9 , 90–2 , 119 , 134–6 , 167–83 , 185–201 , 203–21
see alsoCombinational… ; Logic actions ; MOSFET ; Pulses ; Sequential… ; Switching
block diagrams
90–2
definitions
22 , 50 , 58 , 167–8 , 185–6 , 203
logic probes
91–2 , 244
passive components
56
Digital coding
176–83 , 297–300
Digital filters
90
Digital oscilloscopes
317–18
Digital radio
73 , 105 , 111 , 116 , 169 , 171–2 , 175–6 , 200–1 , 217 , 219 , 240–1 , 307–9
BERs
219 , 301–5
cars
116 , 309
critique
116 , 219 , 308–9
DAB
105 , 116 , 217 , 241 , 307–9
definition
73
FM
73 , 105 , 116 , 117 , 175 , 308–9
old ITV transmitters
116 , 308–9
power consumption problems
308–9
satellite communications
308–9
switch-over date
116–17 , 308–9
whip antenna
116 , 308–9
Digital recording
21 , 119 , 131 , 134–6 , 169–71 , 318–19
see alsoCompact discs
definition
21
Digital signal processing (DSP), CDs
228–33
Digital signals
21 , 50 , 119 , 131 , 134–6 , 167–83 , 218–21 , 228–33 , 237–8 , 240–2 , 258–61 , 266–80 , 294–5 , 297–309 , 317 , 320–2
see alsoMicroprocessors
analog circuits
169–83 , 258–9
correction methods
218–21 , 297 , 300–5
critique
172–3 , 304–5
definition
167–8
digital to analog conversions
180–3 , 274–5 , 302–9
noise concepts
170–1 , 218–21 , 301–5
quantization
173–6 , 240–2 , 300 , 318
recording benefits
169–71
serial transmission/recording
176–7 , 180–3
strength of signal
301–5
tape recording
169–71 , 176–7 , 267
Digital television
73 , 111 , 137 , 143–4 , 165 , 169 , 171–3 , 182–3 , 200–1 , 240 , 297–309 , 317–18 , 324
benefits
137
BERs
219 , 301–5
coding
297–300
definition
73
Freeview
137 , 298 , 304–5 , 309
receivers
305
set-top boxes
137 , 298 , 301 , 303–4 , 306–7 , 324
switch-over dates
137 , 304
Digital to analog conversions
180–3 , 274–5 , 302–9
Digital tuners
111–12
Digital voltmeters
210–14 , 257–8
Digital–optical systems
134
Diodes
42–6 , 48–53 , 91–2 , 106–12 , 146–9 , 151 , 280 , 324–5
see alsoAnode… ; Cathode…
definition
42
infrared waves
45 , 324–5
LEDs
45 , 91–2 , 151 , 280 , 324–5
microwaves
45–6
photodiodes
45 , 225–8
reverse breakdown voltage
42–6
tunnel diodes
46
varactor diodes
44–5
Zener diodes
42 , 43–4
Dipole antenna principles
97–100 , 144–5
Direct current (DC)
8 , 13–14 , 26 , 29–32 , 37–8 , 39–42 , 43–4 , 52–3 , 71–2 , 88 , 93 , 99–100 , 102–3 , 208 , 210–13
see alsoSteady voltage
AC conversion
13–14 , 38 , 43–4
definition
8 , 14
Disc drives
136 , 257–9 , 265 , 281–5 , 306 , 319
Discharge
32–5 , 144–5
Discs
21 , 45 , 63–4 , 69–71 , 86–8 , 120 , 128 , 131–6 , 169–83 , 223–42 , 257–9 , 265 , 274–5 , 282 , 287 , 290–1 , 293 , 306–7 , 318
see alsoCompact discs ; DVDs
digital signals
170–1 , 223–42
electrical recording methods
120–4
gramophones
119–22 , 170–1 , 224
historical background
119–22 , 223–4
noise concepts
131–4
stereo
112 , 122–4 , 227–8
stereo disc recording/replay systems
122–4 , 227–8
Dishwashers
265
Disney
122
Displays
71 , 131 , 137 , 141 , 144 , 145–51 , 159–65 , 183 , 209–10 , 257–9 , 260–1 , 263 , 270–3 , 302 , 317–19
see alsoComputer monitors ; Television
plasma screens
131 , 144 , 150–1
projection displays
161
resolution concepts
138–9 , 143–4 , 150–1 , 270–4
Dissipation
9–10 , 26–8 , 30–2 , 52–3 , 56–7 , 76 , 169
see alsoHeat
analog circuits
52–3 , 56–7 , 76
definition
10 , 26
Distortion
21 , 63–6 , 77–8 , 228–9
Distro
290–1
Division operations
193 , 196–7 , 212–13 , 216
DMT, definition
269
Dolby noise-reduction systems
132–4
Dongles, definition
270
Doping
see alsoSemiconductors
definition
15
Doppler radar
314
Dot-matrix printers
74 , 275
Dots, circuit diagrams
28 , 84
Downlinking frequencies
320
Drains, FETs
51–3
Drift problems, oscillators
111–12
Drivers
274–9 , 293–4
see alsoPrograms
critique
293
definition
274 , 293
Internet downloads
293–4
DTP
272
Dual in-line memory modules (DIMMs)
250–1
Dimmer, G.R
53
dust/scratches, CDs
225–7 , 229
Duty cycle, definition
20
DVD-ROM
257
DVDs
131 , 135–6 , 137 , 156 , 169–70 , 171 , 223 , 236 , 257 , 284 , 287 , 305–7 , 318–19 , 324
capacities
306–7
compatible systems
156 , 306
definition
171 , 223 , 305–6 , 307
future prospects
306
recording methods
171 , 306–7 , 318–19
DVI, definition
273
Dynamic RAM
249 , 251–2
Dynamic resistance
44–5
Dynamos
concepts
7–8 , 11–14 , 19 , 43
definition
7–8 , 11 , 12
types
11
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