How Do Sound Amplifiers Work?
Basics Amplifiers are used to produce sound we can hear from a source we may not be able to hear or hear well, such as from an electric guitar, a compact disc player or a turntable. The electric guitar, for example, produces a small electric current that goes into the amplifier via the wound-coil pickups. The amplifier, using electric current, changes this signal and grows it into a much more powerful signal that is strong enough to produce audible sound by moving the speaker cones. Inside the Amp The guitar signal goes into first a pre-amp that is built into the amplifier case. The pre-amp increases the sound from the input circuit, varies the resistance, then sends the signal to an output circuit. This is how the weak original signal is made ready for output. Several pre-amps may be used to successively increase the signal for the amp. Output The amplifier takes the alternating current from the plug and changes it into direct current so the signal is precise and steady. Transistors o
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