[email protected] wrote: > On Mon, 26 Nov 2012, Jon Elson wrote: > > >> They are phase angle SCR controllers. You put a variable resistance >> across two of the terminals, and they vary the power to a line-powered >> device. Basically a heavy-duty lamp dimmer. >> > > can you give me an example of a 21st century equivalent > Yes, a lamp dimmer, like you put on dining room lights. > would this device, a rectifier, and capacitor be adequate for a stepper power > supply > No, do not use it for stepper motors. It has no relevance at all here. You should use an isolation transformer for nearly all stepper motor power supplies. (A few are made for off-line supply, but most are not.)
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