For testing purposes, I need two circuits: 220Vac rectified and 48Vac rectified, both having the same reference, like this:
But I don't have an isolated transformer 220V:220V. I only have an isolated transformer 220V:48V and an autotransformer 127V:220V. If I connected like that, since autotransformer has no isolation, I'd say my circuit would be equivalent to the following:
I understand that working not isolated from the mains is dangerous but it would be a quick test of a simple circuit. I'd like to know, are the two circuits above equivalents in terms of references? Is there any problem connecting it like that?