Data Sheet

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210. Making ICs – Step 4
Build the circuit, then turn on the switch (62); you will see the heart LED
(69) is on and the colorful LED (72) is shining too.
The fourth step in making an IC for a circuit like this or more complicated
circuits is to perform doping. Doping is the process of heating the
etched wafers with gases containing impurities to physically create the
areas of n-type and p-type silicon. Steps 2 through 3 may be repeated
a number of times to create layers of silicon for more complex circuits.
211. Making ICs – Step 5
Build the circuit shown on the left. Use a piece of long wire to connect
between points A and B (you might need to do this through the bottom
where you can insert the wire ends into the pins). Then connect the
middle of the wire to something valuable in your room. If anyone takes
your valuable, it will pull the wire out of the circuit, the colorful LED (72)
will turn on and warning sounds will be heard from the alarm (78). You
caught the burglar!
The fth step in making an IC for a circuit like this or more complicated
circuits is to perform testing. Testing is performed by a computer-
controlled machine connected to the chips after step 4 is complete.
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