External sound contains any sort of external influences, like exterior components and electrical/electromagnetic interference. Interference is described as any undesirable signals arriving as both voltage or existing, at any of the amplifier’s terminals or induced in its affiliated circuitry. It might surface as spikes, methods, sine waves, or random noise. https://low-noiseamplifier90090.gynoblog.com/36279440/the-fact-about-low-noise-amplifier-that-no-one-is-suggesting