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gerty said:That's an unsual voltage/current combination.. Have you considered a Variac (variable transformer 0-120 volts ) or you could series two 24v power supplies..
stevez said:Take a look at the datasheet for an LM723 regulator. This is a linear regulator that will require pass transistors that will handle the current requirements. Stuff I am used to seeing uses 2N3055 transistors. This is pretty well established circuitry and there are plenty of other ways to do the job including using switching regulators.
I don't know if the 48 volts RMS from the transformer is enough if you really want 48 vdc and want it with no ripple. With no load the capacitor will charge, as you suggest, to the peak voltage however as you load the supply the voltage will drop. If you use a full wave bridge the voltage available to charge the capacitor never goes to zero but at what point it will drop requires some math. Someone else can probably offer some guidance.
Sebi said:As stevez suggested, the 723 datasheet show a "positive floating regulator" solution. With few big transistor(e.g. 2N3055) can build also for 10A output. Also required 30000uF 100V condenser pack for enough filtering. I also worried about 48VAC input voltage, but maybe on transformer have some place for few turns...
eng-bm said:thank you mr sibi (electronic god) for the circuit am looking for easier way
what if i put a transformer of 36v 10a instead of 48v
so i get an output voltage 36*1.414=51vdc
is it ok or this voltage will drop to 36v when i loaded