Page 203 - 15 Dangerously Mad Projects for the Evil Genius

180 15 Dangerously Mad Projects for the Evil Genius

Figure 14-6 The completed board

Figure 14-5 The switch and battery in place

should be positioned as centrally as possible
(Figure 14-5).
Make sure the switch is in the off position.
Remember, from now on we are soldering a board
Figure 14-7 Toothbrush motor
that has a charged battery attached to it, so it would
be quite easy to accidentally short the battery while
his minions to use when they are cleaning his
soldering, which would likely damage it.
teeth. Throwing these away, just because the
The transistors can now be soldered into place. bristles are a little frayed, seems very wasteful to
The phototransistors are soldered in place, leaving any Evil Genius who likes to do a bit of recycling.
their leads as long as possible to allow them to be
These toothbrushes contain tiny lightweight
bent into a snail-eye’s position (Figure 14-6).
electric motors (Figure 14-7) with a semicircular
weight that makes the whole thing vibrate when
Step 3. Salvage the Motors the toothbrush is turned on. A typical example of
such a brush is shown in Figure 14-8.
The Evil Genius is a considerate employer and
buys low-cost disposable electric toothbrushes for

Figure 14-8 Disposable electric toothbrush