turbulatordude wrote: >Hi, > >If I have a 24 volt, (12V-0-12) center tap transformer like the MPJA >unit. >http://www.mpja.com/productview.asp?product=7846+TR > >And isolate the center tap I get 24 volts. > >But when rectified, doesn't the current change also ? > >There is a note in the catalogue that for this wiring the amps are >1.8x > >The catalogue refers to required ouput amps > > >full wave bridge cap input filter 1.8x to required output amps >full wave choke input filter = required output amps >full wave, center tap, cap = 1.2x roa >full wave, center tap, choke = 0.7x roa > > Using the full winding means current flows in both ends of the winding all the time. So, the current rating must go down. With full-wave center tap, each half of the winding gets a rest 50% of the time, so current rating goes up. I guess what they are saying here is that you take the load current and multiply by these factors to get the rating of the transformer.
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