uchihahayato Posted April 2, 2011 Report Share Posted April 2, 2011 Please Help me. I need a schematic diagram of a Transformerless Power Supply.With the following specs.Vin = 220V ACVout = 12V DCCurrent Rating = 3 APlease Please Please :-\ Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 2, 2011 Report Share Posted April 2, 2011 No because it's not practical.Take a typical transformerless power supply circuit:For 3A@12V C1 would need to be 47uF. Quote Link to comment Share on other sites More sharing options...
vendaf Posted August 23, 2012 Report Share Posted August 23, 2012 How about output current that can reach at least 1-1.5A? Is it possible? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted August 23, 2012 Report Share Posted August 23, 2012 How about output current that can reach at least 1-1.5A?What do you think? Is it possible?I didn't say it's impossible, just that it isn't practical. It's theoretically possible. Do the calculations and you'll see what I'm getting at. Quote Link to comment Share on other sites More sharing options...
Mazda Posted July 25, 2016 Report Share Posted July 25, 2016 well 47uf polyster or electrolit Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 26, 2016 Report Share Posted July 26, 2016 The capacitor will have AC across it, not DC so you cannot use a polarized electrolytic capacitor. I could not find a film capacitor rated at 47uF/400VAC anywhere. They were available 60 years ago, were very large and very expensive. But transformers are inexpensive and are available everywhere today. Quote Link to comment Share on other sites More sharing options...
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