Powering devices with different voltages from a single transf.

[kamiwaza]

I'm building a talkbox with its own amp. I am using a commercially-built board which uses a TDA 2050 chip for the power amp. I'm intending to use an AMZ Mosfet Boost as a preamp.

The power amp is configured to use a single rail PSU. I have a transformer which has a multi-tapped secondary - 0v 12v 18v 24v. The power amp works fine with (rectified) 24v. I intend to rectify the 12v tap to feed a voltage regulator which will power the preamp. I'm wondering if this will cause a problem with ground. The power amp has separate power and signal ground planes.

Any thoughts?

Cheers

kamiwaza

[Ripthorn]

There is a potential for problems.  Are these multiple secondaries center tapped or not?  If you are running everything (power wise) from a transformer with common ground, then you will need to make sure that all the pieces can play nicely using the same ground.  This starts to get a little dicey when different pieces are in their own boxes, as star grounding all of a sudden is out the window.  I can't tell you for sure that there will be no problems, but then again, it might work.  If everything will be in it's own enclosure, a decent star grounding scheme ought to work out pretty well and you PROBABLY won't have problems, though I can't guarantee it.