An amplifier can either be a separate piece of equipment or an electrical circuit contained within another device. Amplification is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment. Amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified. For example, audio amplifiers amplify signals in the audio (sound) range of less than 20 kHz, RF amplifiers amplify frequencies in the radio frequency range between 20 kHz and 300 GHz, and servo amplifiers and instrumentation amplifiers may work with very low frequencies down to direct current. Team AlephINDIA is committed to providing you the best quality services for all kind of technical certifications and testing equipment. For more details please visit www.alephindia.in. AlephIndiaqms: A single window for all kind of technical certifications and testing equipment. BIS, WPC, ETA, TAC, BEE, CE, UL, Ewaste, FMCS, CPCB, CARE, ISIMark, Hallmark.