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Linear regulator
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===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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