Today I wired up the alarm system portion of the breadboard... once again, I lacked two 2.2 microfarad resistors so I substituted a 4.7 microfarad for C3 (in Figure 2-113). When I wired up this noise maker using that combo, it worked... but probably didn't sound exactly like it should with two 2.2 microfarads...
I also modified the relay circuit to look like the one in Figure 3-95. When I break the magnetic switch, I hear the relay kick in and it locks, too - resetting the magnetic switch doesn't turn it off.
I hooked up the speaker... flipped the power... broke the magnetic switch... and nothing.
Argh.
(Keep in mind that I'd already used my multimeter to test voltage/current settings - there was a charge of almost 12V built up on C1 capacitor... and about 11V on the two wires I used to connect to the speaker... so... faulty speaker?
Movie of the LED lighting up below...
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