Page 187 - 15 Dangerously Mad Projects for the Evil Genius

164 15 Dangerously Mad Projects for the Evil Genius

Step 4. Mount the Transistor
and Diode

We can now mount some of the electronics onto
the frame. The transistor is fixed in place using one
of the screws that hold the top piece of the frame
in place (Figure 13-9).
Using Figures 13-9 and 13-10 as a guide, solder
the negative lead of D2 (no line) to the center lead
of the transistor T2. Attach the two leads from the
coil to either side of the diode D2. It does not
matter which lead from the coil goes to which side
of the diode.
For reference, the schematic diagram is also
shown in Figure 13-11.
Cut two lengths of reasonably thick wire about
Figure 13-8 The completed frame with the coil 12 inches (300mm) long and attach one to the
attached positive side of D2 (bar) and one to the rightmost
pin of the transistor (the source). Ideally, the first
The completed frame should look something should be red and the other black. Eventually,
like Figure 13-8. Note that the author is no kind these will be soldered to the power connector of
of carpenter! the Arduino board.

Figure 13-9 The components on the top of the frame