RE: [CAD_CAM_EDM_DRO] Re: 80V Toroid & Ferrite Beads

Thanks Jon and John -

This gets filed away in my "keepers" folder. Hopefully it will
help me reduce the amount of copper vapor in my shop. (you should
see my wire-cutters - they make good wire strippers now)

Regards,

Carlos Guillermo
VERVE Engineering & Design

-----Original Message-----
From: Jon Elson [mailto:elson@...]
Sent: Wednesday, December 10, 2003 10:37 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: 80V Toroid & Ferrite Beads


Carlos Guillermo wrote:

>Thanks Jon -
>
>It's starting to become very obvious to me! BTW, how could you
>determine the proper ends of a winding to hook up in parallel if
>the terminals aren't lableled?
>
>

You can use a voltmeter. Assuming a transformer where you don't
know much about it, first just use an ohmmeter to determine which
terminals are part of the same winding. Assuming you have 4
terminals
and find there are two isolated windings, then apply power to the
primary terminals and read the voltages produced by each of the
windings. If they are the same, this is a standard split
secondary.
Connect any terminal from one winding to any terminal of the
other.
Use the voltmeter on AC to check the voltage between the two
unconnected terminals. If you get twice the voltage of a single
winding, you now have the center-tapped condition. If you get
nearly zero voltage, you have the matching ends of the windings
connected together. If you now connect the terminals that the
voltmeter
is on, together, you have set up the parallel circuit for half
voltage
at twice the current.

Jon