how does the amplifier take a quiet sound and make it louder? like how does a component like a valve or a transistor may something loud? and how can those fixed components make it louder variably?
how does the amplifier take a quiet sound and make it louder? like how does a component like a valve or a transistor may something loud? and how can those fixed components make it louder variably?
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There are many different kinds of amplifiers. The easiest to understand is called a BJT. Basically you have a weak signal (from the microphone) going to the middle part in the pictures. The middle part acts like a “valve” controlling the flow of electricity from the top to the bottom. When a small amount of electricity enters from the middle it lets more electricity flow from top to bottom in the pictures.
What they actually do is take a small little fluctuation in electricity and turn it into a great big fluctuation. There are multiple ways of doing this with different sorts of circuit components but effectively an amplifier is a valve on a tube for electricity. The tube can pass lots of high voltages, but the valve prevents it from doing that all the time. However, the valve can be controlled by the much smaller input voltage. So when you send an electric pulse or wave as the small one, that controls the valve so that the big voltage gets altered proportionately to the small changes.
Imagine you could only whisper. The amp is your buddy who you whisper into his ear, and he screams it out.
thank you both, you have litterally explained to me something ive stuggled to find a clear answer too! thank you