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Article #616Re: I need a reminder, what causes voltage drop..
From: Charles Schuler
Date: Tue, 15 Feb 2005 22:10
Date: Tue, 15 Feb 2005 22:10
21 lines
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2634 bytes
"alitonto" <alitonto@hotmail.com> wrote in message news:1108475705.096838.197480@z14g2000cwz.googlegroups.com... > Hello, > I am trying to work out in particular which component is most likely to > cause a reduced voltage at the supply point to its circuit. I suspect > there is something pulling too much current ahead, becuase when I > disconnect the circuit then the supplied voltage returns to normal > measurement. Generally, three things can be considered here. (1) V=IR so if I, the current, or R, the resistance is too high, V, the voltage drop, will be excessive. (2) Some power supplies use current limiting which kicks in at a given point and then they switch over to a constant current mode (as opposed to constant voltage mode). (3) Some power supplies use fold-back current limiting which also kicks in at a given point but the current folds back which makes the voltage drop at the load even more severe. Could be the load is partly shorted, or a series resistance has gone up in value, or a faulty connection, or a faulty power supply. Troubleshooting is usually a process of elimination.
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