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Linear regulator
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==Fixed regulators== [[File:7800 IC regulatorsa.jpg|thumb|200px|An assortment of [[78xx]] series ICs]] Three-terminal linear regulators, used for generating "fixed" voltages, are readily available. They can generate plus or minus 3.3 V, 5 V, 6 V, 9 V, 12 V, or 15 V, with their performance generally peaking around a load of 1.5 Amperes. The "[[78xx]]" series (7805, 7812, etc.) regulate positive voltages while the "[[79xx]]" series (7905, 7912, etc.) regulate negative voltages. Often, the last two digits of the device number are the output voltage (e.g., a 7805 is a +5 V regulator, while a 7915 is a β15 V regulator). There are variants on the 78xx series ICs, such as 78L and 78S, some of which can supply up to 2 A.<ref>{{cite web |title=Datasheet of L78xx Showing a model that can output 2 A |url=https://www1.elfa.se/data1/wwwroot/assets/datasheets/tcL78S_data_e.pdf |url-status=dead |archive-url=https://web.archive.org/web/20150613174049/https://www1.elfa.se/data1/wwwroot/assets/datasheets/tcL78S_data_e.pdf |archive-date=2015-06-13 |access-date=2015-06-11}}</ref> ===Adjusting fixed regulators=== By adding another circuit element to a fixed voltage IC regulator, it is possible to adjust the output voltage. Two example methods are: # A Zener diode or resistor may be added between the IC's ground terminal and ground. Resistors are acceptable where ground current is constant, but are ill-suited to regulators with varying ground current. By switching in different Zener diodes, diodes or resistors, the output voltage can be adjusted in a step-wise fashion. # A potentiometer can be placed in series with the ground terminal to increase the output voltage variably. However, this method degrades regulation, and is not suitable for regulators with varying ground current.
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