■ INDEXlat jumper wire, 152
ready-made, 152
reinforced, 151
serrated-jaw long-nose pliers, 157
smooth-jaw needle-nose pliers, 156
wire strippers, 153
LED power indicator, 167
lower bus rows, 166
multimeter probes, 164
power sources, 159
binding posts, 160
9 V battery snap connector, 160
power switches, 161
600SP1S2 switch, 162
EG1218 switch, 162
negative battery power, 163
SPDT slide switches, 162
Robot power switches
stranded wires, 149
switch actuator, 164
tie points, 140
trimming leads, 168
25-position distribution bus, 145
Solid wire, 306
Sound components, 416
SPDT slide switches, 162
Speaker, 416
Stranded wire, 306
Street mailbox robot, 423
Switches and battery holder
line-following switch, 364
9 V battery holder, 365
power switch, 363
Switches and motors
DPDT switches, 320
heat-shrink tubing, 305
line-following switch, 320
main circuit board, 305
Molex KK connectors, 305
preparing and attaching wires, 321
soldering process, 321
Switch iltering, 411
Switching regulators, 406
T
Tape lines, for Sandwich operation, 63
Temperature sensors, 413
hermistors, 413
3D printer, 350, 435
3D printing, 435
3D wheel, 443
motor coupler, 437
robot body design, 446
3D wheel, 443
Tilt sensor, 412
Tiny pager motors, 8
Torque, 235
Touch sensors, 413
Transistor mode, multimeter, 37
Transistor switches, pin labeling, 433
Trash emptying robot, 422
Tricolor LEDs, 117
Trimpot testing, 381
Trinity college ire-ighting contest, 424
Tube LED circuit
glowing center tube, 325
power switch, 326
resistor soldering, 326
schematic circuit, 325
Tweaking. See Correcting and tweaking
2907A transistor, 208
datasheet, 209
pushbuttons, 209
solderless-breadboard, 209
TO-92 package, 208U
Underwriters Laboratory (UL), 34
Units of measurement
color to number conversion, 57–59
common units, 55
component value checking, 59
missing units, 56–57
three digit number, 57
USB data interface, 39V
VA38 meter, multimeter, 46, 48
VC97 auto range digital multimeter, 45
Voltage
determining current from, 428
negative voltage, 432
reversing 9 V batteries, 430
Voltage-adjustable DC power supply, 25
Voltage comparator, 191
LM393
comparators, 194
datasheet, 192
pinout, 192
Voltage measurement, multimeter, 33, 42
Voltage regulators
linear regulators, 406
packages, 406
selection criteria, 407
switching regulators, 406