ArJunaBug said:
The 7805/7905 regulators are seeing only plus or minus 18VDC respectively on their inputs. Is this too high you think?
18VDC wouldn't be too high, of course, but in your schematic
all your regulators receive the rectified 28V AC voltage, which results in ≈ 38 .. 40VDC, at least at no-load condition. If you consider a possible mains overvoltage of 10 .. 15%, this could result in a no-load primary DC voltage of up to ≈45V, and this is clearly
too high for all your regulators. The 7805/7905 regulators are limited to max. 35VDC input voltage for +5V resp. -5V output.