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Similarly, an overdriven transistor amplifier can take on the characteristics of a controlled switch having essentially two levels of output. Analog circuits use a continuous range of voltage or current as opposed to discrete levels as in digital circuits. Analog circuits are sometimes called linear circuits although many non-linear effects are used in analog circuits such as mixers, modulators, etc. The help desks of a multinational corporation might thus employ, successively, teams in Kenya, Brazil, the Philippines, or India, with the only requirement fluency in the mother tongue, be it Spanish, Portuguese or English. This type of circuit is usually called "mixed signal" rather than analog or digital.

These leads connect to create an electronic circuit with a particular function (for example an amplifier, radio receiver, or oscillator). The number of different analog circuits so far devised is huge, especially because a 'circuit' can be defined as anything from a single component, to systems containing thousands of components. Good examples of analog circuits include vacuum tube and transistor amplifiers, operational amplifiers and oscillators.

In an integrated circuit or IC, the components and interconnections are formed on the same substrate, typically a semiconductor such as silicon or (less commonly) gallium arsenide. Analog circuits are sometimes called linear circuits although many non-linear effects are used in analog circuits such as mixers, modulators, etc. One rarely finds modern circuits that are entirely analog. Electronics is the science of how to control electric energy, energy in which the electrons have a fundamental role. Analog electronic circuits are those in which current or voltage may vary continuously with time to correspond to the information being represented. These leads connect to create an electronic circuit with a particular function (for example an amplifier, radio receiver, or oscillator). The website 'The High Tech Society' focusing on recent tech news and developments as well as game and gadget reviews could also be referred to as the high tech society. When the circuit size is comparable to a wavelength of the relevant signal frequency, a more sophisticated approach must be used. Electronic components have two or more electrical terminals (or leads) aside from antennas which may only have one terminal.