nutty boy Posted May 6, 2006 Report Share Posted May 6, 2006 Hi GuysThis is my 1s post on this lovely forum,and i wish some one to help,i have a transformer all what i know about him is that the output voltage is 12 V and all i want to know is "what's the max output current that transformer can support" if any one has an idea pls helpregards Quote Link to comment Share on other sites More sharing options...
SM2GXN Posted May 6, 2006 Report Share Posted May 6, 2006 Hi nutty boy!I can tell you right away.. it's impossible, it can be everything from a few mA to several amps ::)No one can possibly tell you that if you don't tell us what kind of transformer you have it would just be a huge guess to estimate from one clue "12 volts"How big is the transformer 1x1m or 5x5cm, what kind of core toroid or laminated EI, wire gauge?Here is a software you can download and play with:http://student.math.hr/~sklaic/electronics/This software might be a shortcut to estimate your transformers power handling capability ;D Quote Link to comment Share on other sites More sharing options...
mrgjc Posted May 7, 2006 Report Share Posted May 7, 2006 your transformer will produce max of 3.5 A Quote Link to comment Share on other sites More sharing options...
SM2GXN Posted May 7, 2006 Report Share Posted May 7, 2006 There must be something I've missed ???Where did you get 3,5 Amps? mrgjc I would really want to get hold of that formula you used to calculate those 3,5A ;) Quote Link to comment Share on other sites More sharing options...
ante Posted May 7, 2006 Report Share Posted May 7, 2006 It’s all about “X” here! ;D Quote Link to comment Share on other sites More sharing options...
Muhammad Abu Bakar Posted May 16, 2006 Report Share Posted May 16, 2006 Hello nutty boy!Here goes an experiment to measure max output current.1. Measure o/p voltage or trafo as V1.2. Put a high wattage low value variable resistance (better use Rheostat) with max resistance.3. Decrease load resistence untill you get half of V1 (i.e. V1/2)4. Take rheostat/load out from circuit and measure its resistance, R15. V1/R1 is the max current u can have from this trafo.O.K. Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 16, 2006 Report Share Posted May 16, 2006 Muhammad,With only half the transformer's voltage at its output, it will be severely overloaded if it is a powerful transformer!A cheap little transformer might have such poor internal regulation that its open-circuit output voltage drops to half with its rated load.But a half-decent transformer would have its output voltage drop about only 5% or less. Quote Link to comment Share on other sites More sharing options...
Muhammad Abu Bakar Posted May 17, 2006 Report Share Posted May 17, 2006 Hello AU,Luckily I had oppertutinity to play with 1KVA trafo at my college. I can remeber the load test where we dropped upto near 50% voltage. Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 17, 2006 Report Share Posted May 17, 2006 Luckily I had oppertutinity to play with 1KVA trafo at my college. I can remeber the load test where we dropped upto near 50% voltage.Impossible. A transformer is supposed to pass power, not use it. It would smoke if it dissipated 1kW.A little 9V/200mA wall-wart adapter is sometimes 18V without a load, but with a 200mA load it dissipates only 1.8W. Quote Link to comment Share on other sites More sharing options...
Silicon Posted May 18, 2006 Report Share Posted May 18, 2006 take U multimeter,set it to measure current,and then touch multimeter contacts to transformer output ;)P.S---DO NOT DO WHAT I SAID Quote Link to comment Share on other sites More sharing options...
gogo2520 Posted May 19, 2006 Report Share Posted May 19, 2006 Hi guys The more I read this form the more i want to start my own thread Called In LayMen Terms. fist off nutty boy Where did you get the transformer.? If you got it out of a piece of old something there should of been a ratting on either amps or wattage. That might help us. Or did you buy it from a store? they should be able to tell what it is. What kind of test equiment do you have and how much experence do you have? There is a lot of questions we have too. Asking is a good start, so don't stop. gogo Quote Link to comment Share on other sites More sharing options...
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