RE: [CAD_CAM_EDM_DRO] Re: Simple PSU stuff

The transformer is not necessarily over-rated. The output voltage of a
transformer should be delivered at full load. Which means that the windings
have to be designed for a slightly different ration than the N1:N2 = V1:V2
ratio to account for voltage drop in the winding resistance. A cheap (well,
inexpensive; nothing's really cheap in this hobby) 12 volt transformer will
be wound with smaller gauge wire than a higher quality one, so the no-load
output voltage may be higher.

If you're meaning that 12 volts rectified delivers about 16 volts, that's
not an over-rating situation either, but simply how a full wave rectified DC
voltage relates to the AC input to the rectifier. The multiplication factor
is always 1.414 (square root of 2)

-- Jerry


|
|Hmmm.. Okay.
|
|I may connect them in parallel as I've noticed that transformers
|generally tend to be over-rated (like a 12V transformer delivering
|16V etc.), but I won't know until I actually check it with a multi-
|meter.