In this experiment, a speaker, a transformer and an oscillator circuit (made up of a transistor and varying resistors and capacitors) is used to create sound. A speaker converts electrical energy into sound (mechanical vibrations). In order for the speaker to work, energy from an AC electrical signal is needed. This is achieved with the transformer (converts high-voltage/low-current to low-voltage/high-current) and an oscillator circuit made up of one transistor and varying capacitors and resistors.
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