Adding a bunch of component to create an alarm sound.
Alright im not going to explain everything, just to say that the size of the capacitor regulate the frequency at which the LED would flash in the first part of experiment 11.
If we use a capacitor that has a very high frequency, you'll get a constant on-off really fast which can be translated in a sound.
Get this signal to go on and off at a slower rate and you'll end up having something that sounds like an alarm.
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