External sound involves any type of exterior influences, including exterior elements and electrical/electromagnetic interference. Interference is described as any undesirable signals arriving as both voltage or present, at any of your amplifier’s terminals or induced in its linked circuitry. It might seem as spikes, ways, sine waves, or random sounds. https://low-noiseamplifier67888.bloggerswise.com/45228323/everything-about-low-noise-amplifier