the other is fully electronic or magnetic with electronic voltage regulation built in.
I've never seen an electronic transformer, apart from the type used to power halogen lamps and in that case the output is normally a high frequency square wave, not a 50Hz sine wave.
Could you please post a link to one?
I imagine an electronic transformer would be very complicated. First the AC needs to be rectified to DC, then an inverter is required to convert it to a different AC voltage, The inverter won't be simple, to get a good sine-wave, a class D amplifier would have to be used.
I would imagine that an electronic transformer would already have built-in over-current protection so overloading it shouldn't do any damage, the chances are it would just shut down, then try to restart after a certain period of time.
Neither type is very fond of heavy inrush currents.
I don't know about an electronic transformer but I know a magnetic transformer won't be damaged, just look at any audio amplfier power supply schematic and you'll see a huge electrolytic capacitor immediately after the rectifier which will short circuit the transformer when the power is first applied. So much so that a large audio amplifier will have inrush protection, but not to protect the transformer but to prevent the fuse from blowing every time it's powered up.
The regulated ones are designed for use with delicate electronic devices that can't handle a wide variation in voltage.
I don't see why you'd ever need a tightly regulated mains supply?
Most delicate electronic devices are powered from a switched mode supply which can accept a wide range of mains voltages. Those pesky SMPSes also tend to draw a large inrush current because they have a capacitor connected to the output of a rectifier.
thats a very bad idea, particularly as a recomendation, if you choose to take that risk yourself fair enough, don't suggest it to someone that may not understand the implications
I disagree because I did warn him of all the possible dangers.
There's virtually no risk of a fire because all modern mains transformers are thermally protected - it's a legal requirement.
Unfortunately, the trouble is the thermal protection is often also non-resettable so it is a risk but not a fatal risk.
I'd rather educate someone so they can make up their own mind up rather than be a nanny and say don't do it.