An emitter is a device used in drip irrigation to transfer water from a pipe or tube to the area to be irrigated. Typical emitter flow rates are from 0.16 to 4.0 gallons per hour, or 0.6 to 15.1 litres per hour. In many emitters, flow will vary with pressure, while some emitters are pressure compensating. These emitters employ siliconediaphragms or other means to allow them to maintain a near-constant flow over a range of pressures, for example from 10 to 50 PSI, or about 70 to 350 kilopascals.
The Emitter II provided for review included five mirror-imaged sets of line-level, unbalanced RCA inputs, one set of balanced inputs (the signal is converted internally to unbalanced), and two RCA Tape Out jacks (other input options are possible).
The Emitter II can be custom-built to offer two sets of speaker terminals, a front- or rear-mounted headphone jack, and a tape monitor switch.
The Emitter II's main chassis alone is rather large.
The term "common emitter" refers to the fact that the emitter node of the transistor (indicated by an arrow symbol) is connected to a "common" power rail, typically the 0 volt reference or ground node.
For the common emitter circuit on the right this is necessary to ensure the transistor is in the active mode and thus prevent it from acting as a rectifier which would cause clipping on the negative portion the input signal, resulting in a distorted output.
Common emitter circuits are used to amplify weak voltage signals, such as the faint radio signals detected by an antenna.
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