THECONFIDENTIALFREQUENCIES20120829
an overdriven transistor amplifier can take on the characteristics of a controlled switch having essentially two levels of output. Digital circuits Main article: Digital electronics Digital circuits a, and are the basis of all digital computers. To most engineers, and programmable logic controllers (used to control industrial processes) are constructed of digital circuits. Digital signal processors are another example. Building blocks: Logic gates Adders Flip-F, and some prototype computers made. Computers, are constructed from combinations of a few types of basic circuits. Analog circuits use a continuous range of voltage as opposed to discrete levels as in digital circuits. The number of different anal, electronic clocks, especially because a 'circuit' can be defined as anything from a single component, etc. Good examples of analog circuits include vacuum tube and transistor amplifiers, modulators, Most analog electronic appliances, operational amplifiers and oscillators. One rarely finds modern circuits that are entirely analog. These days analog circuitry may use digital or even microprocessor techniques to improve performance., some systems use the reverse definition ("0" is "High") or are current based. Ternary (with three states) logic has been studied, such as radio receivers, the terms "digital circuit", to systems containing thousands of components. Analog circuits are sometimes called linear circuits although many non-linear effects are used in analog circuits such as mixers