More about transformers

[ormo]

I know I've been posing many threads about transformers... I promise this is the last for a while

If a transformer has two individual 24VAC secondary windings, can they be connected as follows to create a 24-0-24 centre tapped supply and then rectified into a 33.6V dual power supply?

 o--@ || @--24V-------┐
    @ || @            |  ____
    @ || @---0V---┐   | |    |
230 @ ||          ├-┐ └-|~  +|------┬--- + 33.6 V
VAC @ || @--24V---┘ |   | BR |      |
    @ || @          | ┌-|~  -|--┐   |
 o--@ || @---0V-----]-┘ |____|  |   =  <-- Filter cap, perhaps 4,700 uF
                    |           |   |
                    |           |   |
                    └-----------]---+---   0 V
                                |   |
                                |   |
                                |   =
                                |   |
                                |   |
                                └---┴--- - 33.6 V

Again please excuse the ASCII art as opposed to actual drawings.

 

[ormo]

Or would it make more sense to perform full wave rectification on both and then combine the two 33.6V outputs?

 

[Leftyretro]

Or would it make more sense to perform full wave rectification on both and then combine the two 33.6V outputs?

Apples and oranges. The circuit you drew provides two independent voltages a positive one and a negative one. The second one you propose would give one voltage but at twice the current. Same total wattage capability in both cases.

Lefty

 

[Speakerguy]

Yes, you can put them in series if you go with the two bridge rectifier method. You just put the 2nd bridge rectifiers + output to the gnd output of the first.

The only reason to do this is if you need really high current, or if you plan to use the two-positive-regulators trick to get regulated + and - rails using identical positive regulators (since some regulators don't have negative equivalents).