How to Apply a Pulse to a Speaker Using a Capacitor

For this project, we're going to demonstrate how a capacitor can supply a pulse signal to a speaker. We're going to charge a capacitor and then discharge the voltage of the capacitor to a speaker. The speaker, a transducer which turns electrical signals into sound, will play out the discharging voltage of the capacitor. What you should hear in the end is a sharp "click sound."

Parts Needed
-9-volt Battery
-2 Pushbuttons
-A 1 µF electrolytic capacitor
-Any basic Speaker

Below is the schematic for the circuit that we're going to put together:

Capacitor supplying pulse to speaker

Below is the real life representation of the above circuit:

Capacitor applying pulse to speaker

This is how the circuit works
When you press down the first pushbutton, Pushbutton 1, you charge the capacitor up. After a few seconds, the capacitor will be charged up to the 9 volts that the power supply is supplying it. Now release pushbutton1 and now press down pushbutton 2. The capacitor now discharges the voltage it charged up. The result is that the speaker plays out this discharging as a sharp click sound that occurs once and then fades away. This is because the capacitor discharges at 9 volts and then decreases until it's 0 volts.

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