ignitedindian Posted January 1, 2007 Report Share Posted January 1, 2007 Can anyone please guide me how to make a variable power supply??? Quote Link to comment Share on other sites More sharing options...
jgeidl Posted January 1, 2007 Report Share Posted January 1, 2007 You are going to need to put some parameters around this question.From what voltage to what voltage?AC or DC?How much amperage?Jim Quote Link to comment Share on other sites More sharing options...
ignitedindian Posted January 1, 2007 Author Report Share Posted January 1, 2007 i want to make a 0to30 volt DC power supply....i should be able to vary the output voltage smoothly/continously(i.e. any value between 0 and 30) and not just in steps like 0-2-4-6... Quote Link to comment Share on other sites More sharing options...
mvs sarma Posted January 1, 2007 Report Share Posted January 1, 2007 Hi, if you can scan the bundle of projects you find on the opening page of this site, you will go thro and you get a lot of data. eventually lot of diacussion posts are also on this topic and i am sure you will be stomach full .all the best for 2k7 Quote Link to comment Share on other sites More sharing options...
jgeidl Posted January 1, 2007 Report Share Posted January 1, 2007 If you can tolerate a little more than 0V on the bottom end and a little less than 30V on the top end AND you don't have a burning dsire to build the whole thing yourself you might want to take a look at these power regulators on eBay: 250068727100 . I have used these several times and been very pleased with the results.Jim Quote Link to comment Share on other sites More sharing options...
ignitedindian Posted January 1, 2007 Author Report Share Posted January 1, 2007 nice option . . . but wud like 2 make one myself... Quote Link to comment Share on other sites More sharing options...
jgeidl Posted January 1, 2007 Report Share Posted January 1, 2007 Good for you. Do a Google search on LM317. This si a voltage regulator that is perfect for what you want to do. The datasheet has some good examples in it, as I recall. You will find a lot of hits for this part as it is fairly common.Jim Quote Link to comment Share on other sites More sharing options...
ignitedindian Posted January 2, 2007 Author Report Share Posted January 2, 2007 Thanks . . . ll try it today . . . Quote Link to comment Share on other sites More sharing options...
MP Posted January 7, 2007 Report Share Posted January 7, 2007 Click the Articles" button at the top of the page and in the "General" group, you will find a LM317 tutorial with a calculator that will help you calculate the voltage output. As Zeppelin has mentioned, you are limited on current unless you add additional hardware. and/or heatsink.MP Quote Link to comment Share on other sites More sharing options...
MrHeckles Posted January 8, 2007 Report Share Posted January 8, 2007 Out of curiosity has anyone found any advantage in using a switching voltage regulator, rather than the LM317, for a variable power supply? Quote Link to comment Share on other sites More sharing options...
MP Posted January 8, 2007 Report Share Posted January 8, 2007 Advantages are less heat dissipation and the amount of current required.MP Quote Link to comment Share on other sites More sharing options...
MBShaw Posted January 14, 2007 Report Share Posted January 14, 2007 You might find that a simple variable potentiometer would suit your purpose, available from Maplins for pennys, if you look at their online catalogue you should be able to find one that suits.You need to determine the amount of resistance in your circuit and then select a var pot that spans that. Quote Link to comment Share on other sites More sharing options...
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