rehanessa Posted February 7, 2005 Report Share Posted February 7, 2005 in the design 2200uf capacitor has been used. is there any specific reason for that? Any calculation to justify this value?what will be the effect on circuit if i make it say 100usecondly, two of the three capacitors used in the design are electrolytic while one is not. why so?Project Link: http://www.electronics-lab.com/projects/power/010/index.html Quote Link to comment Share on other sites More sharing options...
ante Posted February 7, 2005 Report Share Posted February 7, 2005 Hi rehanessa,The circuit is calculated for a peak current of 1.5A and the 2200uF capacitor will keep the ripple within a reasonable value. If you use a 100uF instead the ripple would rise to an unacceptable level. The non-electrolytic capacitor is to prevent self oscillation in the regulator, the low value is not standard in electrolytic caps. Quote Link to comment Share on other sites More sharing options...
rehanessa Posted February 8, 2005 Author Report Share Posted February 8, 2005 now i wish to replace lm317 by lm338(5A max current ) and modify the circuit for 5A peak current. now what would happen to the 2200uf capacitor.there should be some formula,calculations etc to evaluate the correct value of this capacitor.also i could not understand what you mean by "self oscillating in regulator" can you please clear it for me? Quote Link to comment Share on other sites More sharing options...
ante Posted February 8, 2005 Report Share Posted February 8, 2005 I would recommend 10000uF or at least 6800uF for 5A peak current. Self-oscillating is the result of the regulator Quote Link to comment Share on other sites More sharing options...
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