How do digital devices like laptops and smartphones increase and decrease speaker volume on the physical level?
In: 7
That’s possible by providing a varying voltage to the amplifier.
Voltage can be controlled digitally with different methods.
A common method is pulse width modulation, where a high voltage potential is hacked into smaller pieces, and smoothened afterwards. The longer the pulses the higher the resulting voltage.
Another method is using resistors to decrease the voltage. Resistors can be switched together, one by one.
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