Parallell bridges - one winding.....

[AuroraB]

I may have painted myself into a corner, just by loosing focus on a small but important detail.....
I need to test a preamp with dual mono dual PSU, - but a brain fart has left me with room for only one transformer, with dual secondaries. Each PSU have dual bridges for pos and neg regulators. The final solution is of course to make a special order for a trafo with four secondaries, which will take som time. In the mean time, a possible solution is to feed e.g. the two positive bridges from a common winding, and negatives from the other....
This is far from an ideal solution, and one I'd never given a thought, but somehow my head says "why not" ?????
What say you? Anyone done this??

 

[FauxFrench]

That problem does not worry me. Do as on the schematic below. Use two rectifier bridges and separate sets of power rail decoupling capacitors. The difference from four secondary windings will be very small.

More worrying is "Location: Norway, -north of the moral circle..". Lilyhammer or even worse Oslo ? How do you expect a power supply to function if you do not even respect the laws of physics?

 

[sgrossklass]

This may upset the grounding scheme though, depending on how that looks in the first place. Might still be good enough for testing, but don't be too surprised if you get some ground loop issues...

Going dual mono on a preamp seems a bit silly to begin with.

 

[AuroraB]

Well, - it's a RIAA designed for dual mono in the first place... otherwise known as XONO..

 

[Vovk Z]

The final solution is of course to make a special order for a trafo with four secondaries, which will take som time. In the mean time, a possible solution is to feed e.g. the two positive bridges from a common winding, and negatives from the other....

To it was dual mono only two voltage doublers can help (or four secondaries of cause).