Re: Sizing a power supply

Date: Tue, 13 Jun 2000 16:00:00 EDT
From: ptengin@...
Subject: Re: Sizing a power supply

In a message dated 06/13/2000 9:16:50 AM Hawaiian Standard Time,
jmelson@... writes:

<< Yes, if you have a transformer with the adjustment taps, then you are
set. Otherwise, you
could use a 208/220 volt autotransformer in front of the isolation
transformer to vary
the output voltage.

Jon

>>

Jon,

Thank You for the info. Along with the sizing info of the filter
caps, I
think building a workable PS should be a snap.

I'll get busy.

Peter
THRD, Inc.

Hi Peter:
Something that may be passing without really being noticed, "the
isolation transformer" .

This is a VERY important safety consideration. What I first noticed in
this thread, was "buck-boost transformers". These may, or MAY NOT have
isolated windings. In fact, a lot of 'buck-boost' devices are in fact
'auto transformers', which provide NO isolation.

The main point of possibly deadliness, is that if you are not careful,
you may end up with raw 110VAC directly connected to one of your
'stepper' power leads. Not affecting anything, until you inadvertently
touch a finger or tool sometime.

Chuck D.
--
-----------------------------------------------------------
He, who will not reason, is a bigot; William Drumond,
he, who cannot, is a fool; Scottish writer
and he, who dares not, is a slave. (1585-1649)
While he that does, is a free man! Joseph P. 1955-
-----------------------------------------------------------
Chuck Davis / Sutherlin Industries FAX # (804) 799-0940
1973 Reeves Mill Road E-Mail -- cad@...
Sutherlin, Virginia 24594-3819 Voice # (804) 799-5803