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b. Solder the red wire to the brass part of the disc (41,42).
41
2. Now you need to electrically insulate the piezo disc. When we make Cortados in the lab, we
use Plasti-Dip tool handle coating, but you can use electrical tape.
a. Wrap the piezo disc in electrical tape (43,44). Keep the tape only one layer thick,
especially on the back (the flat side) of the disc. Use two pieces of electrical tape butted side-
by-side to wrap the disc (45).
43
45
42
44
18
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