External noise includes any kind of exterior influences, including external components and electrical/electromagnetic interference. Interference is outlined as any unwanted alerts arriving as both voltage or present, at any of your amplifier’s terminals or induced in its affiliated circuitry. It may appear as spikes, steps, sine waves, or random sound. https://low-noise-amplifier56667.post-blogs.com/57963163/low-noise-amplifier-no-further-a-mystery