Diode bridge

[Remondepemon]

Hi everybody,

I am building a power supply that needs 26V power for the analog part.
Then, there is other stuff that runs on 12 and 5V.
I could just use an 7812 & 7805 for it, but I don't want to dissipate so much heat.

Plan B: What about using a transformer that has an extra pin in the middle?
Then I need a transformer of 2x9 = 18V.
For the high voltage stuff I use 2 secondary coils and for the low voltage stuff just one of the coils.

Here is a schematic, can anybody please tell me if this will work or there will be smoke?


Thanks!

[Remondepemon]

whoops, an error in the schematic! 

[T3sl4co1l]

Not smoke, but if you put a cap on it, you'll get 26V+ again.....

Take a close look at what the diode bridge is doing.  The CT alone will be at 13V relative to the one-side-grounded bridge.

Tim

[Remondepemon]

Tim,

I started to draw two separate bridges and discovered that 2 diodes were parallel. I deleted these two and then this schematic what there.
What do you mean by CT and what would your advise be?

Remon

[T3sl4co1l]

CT = center tap, the middle of the winding.