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you have a full wave rectifier, not a full wave bridge rectifier

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Your circuit uses 1/2 the secondary for each half cycle whereas a bridge uses the whole thing on each 1/2 cycle.

The math is 3.15 V RMS for each half cycle so 3.15 x 1.414 = 4.5V peak

minus the diode drop and filtered should get you somewhere around what you got if the line voltage is a little high and/or the secondry a little higher than it should be. Without a load drawing current it will be higher as the xformer is probably rated at full load so the 4.8VDC makes sense.

Use a full wave bridge to get a higher VDC



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