kumar_prashu Posted September 19, 2004 Report Share Posted September 19, 2004 Hello I m trying to make a variable voltage Rectified power supply using LM338. But i am facing an unusual problem of ripple at the output of LM338. when I set the Output at the particular voltage, the ripple current at the output just doubles the DC value. just as if DC o/p = 12 volts. AC o/p = 24 volts.The exact specs. of the components are as follows:Transformer- 220/15-0-15 volts, 5 Amps. (center tapped)Diodes- MIC 6A4 Cap.- 10,000 microfarad /25 volts.(at the o/p of rectifier)large value is just to keep the low rippleLM338: 0-5 Amps. input- output differential voltage = 3 voltsWhy do this happens.pls explain.I want to completely remove the ripple content. Quote Link to comment Share on other sites More sharing options...
MP Posted September 19, 2004 Report Share Posted September 19, 2004 How are you rectifying this voltage? Post a schematic.MP Quote Link to comment Share on other sites More sharing options...
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