Definition

1. Noun:
   • Electronic device for increasing signal strength: An amplifier is a piece of electronic equipment designed to increase the power, voltage, or current of a signal passing through it. Its primary function is to take a weak input signal and produce a stronger, amplified output signal without significantly distorting the original waveform.

Usage and Examples

• Noun:
  • The guitarist plugged his instrument into the amplifier to make the sound loud enough for the concert hall.
  • In a public address system, a microphone sends a signal to an amplifier, which then drives the speakers.
  • The strength of the radio signal was too low, so they used an amplifier to boost it for clearer reception.

Advanced Usage and Technical Context

• Operational Principle: An amplifier works by using an external power source (like electricity from a wall outlet or a battery) to control a larger output signal that mirrors the characteristics of a smaller input signal.
• Key Performance Metrics: When discussing amplifiers, terms like gain (the ratio of output to input), bandwidth (the range of frequencies it can amplify), and distortion (unwanted changes to the signal) are often used.
  • The amplifier's high gain made the faint whisper audible throughout the room.
  • A high-fidelity audio amplifier must have low distortion to reproduce music accurately.

Variants and Related Words

• Preamplifier (or Preamp) (n): A device that amplifies a very weak signal (e.g., from a microphone or phonograph cartridge) to a level suitable for input to a main power amplifier.
  • The recording studio uses a high-quality preamplifier for the vocal microphone.
• Power Amplifier (n): An amplifier designed specifically to deliver high power to a load, such as a loudspeaker.
  • The power amplifier for the subwoofer requires a robust cooling system.
• Amplify (v): The verb form, meaning to increase the strength, volume, or effect of something.
  • The new evidence served to amplify the concerns of the investigators.

Synonyms

• Booster: A device for increasing signal power or voltage.
• Signal Enhancer: A general term for a device that improves the quality or strength of a signal.

Related Phrases and Compound Terms

• Guitar Amplifier: A combination of amplifier and speaker in a single cabinet, specifically for electric guitars.
  • He saved up to buy a vintage tube guitar amplifier.
• Operational Amplifier (Op-amp) (n): A high-gain voltage amplifier with a differential input, typically used in electronic circuits for mathematical operations.
  • The circuit design relies on an operational amplifier to subtract the two input voltages.

Noun

1. electronic equipment that increases strength of signals passing through it