Quote Originally Posted by CNCStudent View Post
transformer rated at 50v ac, once rectified will provide ~70v DC (with no load), is this not a little high given the geckodrive guidance is 32 x SQRT (L), where L is in mH.... [32xSQRT(3.2) = 57v]
This is the problem I referred to. OTOH I didn't quite get that this thing was designed for an AC input, so maybe I should have kept my wug shut

The problem with rectifying and smoothing a transformer is that you get peak volts at no load and a square wave as you start pulling power. If you try to smooth it the capacitors quickly become bucket sized and hideously expensive.

A switchmode PSU uses the bottom end of the rectified wave form where the low voltage gaps are so much narrower and you can keep the power flow using inductors.