nikhil arora Posted March 4, 2006 Report Share Posted March 4, 2006 Can any one suggest a Circuit for getting 3-5V DC @50mA from 230V AC without transformer or any other ways. Quote Link to comment Share on other sites More sharing options...
Shahriar Posted March 4, 2006 Report Share Posted March 4, 2006 HiThe circuit I have attached is from a Project in project section of this site with this topic." Courtesy Light "you can use the power section of this project with some changes.Once I saw a project on the web with this title." Transformerless Power supply" as I remember it has did the same trick.HTH - Shahriar Quote Link to comment Share on other sites More sharing options...
Tony_Stoynov Posted March 5, 2006 Report Share Posted March 5, 2006 Hi,in the post above, you can see ones of the possible decision, but this decision has one disadvantage, minimum dispersed power @50 mA is it around 5 W. If you not have a space for a big components, or you want cold device, the better choices is using of SMPS, i can suggest TNY series from Power Int.Look here : http://www.mcu-bg.com/mcu_site/viewtopic.php?t=1052&postdays=0&postorder=asc&start=75, you can see the TNY and TOP sch, also if you look at all topic, you can see the different diagram for directly 220 V power supply. Quote Link to comment Share on other sites More sharing options...
Shahriar Posted March 5, 2006 Report Share Posted March 5, 2006 BTW, If you don't want to build one, You can buy a Mobile Charger and enjoy it...HTH - Shahriar Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 6, 2006 Report Share Posted March 6, 2006 Hi nikhil aroraHer you have your requested cirquit to get 3 to 5 Volt DC from 230 Volt AC without transformer, as a matter of fact, there is 2 of them, one with only positive output related to common, and one with both positive and negative output related to common.[move]A little VARNING here! This is LETHAL![/move]//Staigen Quote Link to comment Share on other sites More sharing options...
steev Posted March 7, 2006 Report Share Posted March 7, 2006 can we glow a 3v led(@20-30ma) using above schematic.iam also looking for such circuit.it is for powering a single led.i can't use transformer as there is no enough space.i tried in groups(google) most of them look dangerous to me.is there any safe design Quote Link to comment Share on other sites More sharing options...
steev Posted March 11, 2006 Report Share Posted March 11, 2006 i found 2 ckts for this purposehttp://www.geocities.com/tjacodesign/supply/supply.htmlhttp://www.electronics-lab.com/projects/power/022/which one u think efficient and safe for driving an led Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 11, 2006 Report Share Posted March 11, 2006 i found 2 ckts for this purposehttp://www.geocities.com/tjacodesign/supply/supply.htmlhttp://www.electronics-lab.com/projects/power/022/which one u think efficient and safe for driving an led The text in the 1st one says it is not efficient and is not safe.The 2nd circuit is the same. Quote Link to comment Share on other sites More sharing options...
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