Re: [CAD_CAM_EDM_DRO] looking for a 20vac transformer resource

In a message dated 2/19/2005 11:02:10 P.M. Central Standard Time,
montejw@... writes:

A 20v transformer would get me 28vdc, if I
have the math right, which is close enough. Where can I get one (or
2) of these.


Monte: If that 24 V transformer you have is wound on nylon bobbins (not
all wound up in Kraft paper and soaked in Formvar), you can simply remove some
turns, re-connect the wire, and you got it! You can tell how MANY turns to
remove by poking a bit of magnet-wire through the core and around two or four
times, then measure the voltage across that "winding", with the transformer
powered (be sure and insulate the loose secondary lead-wire ends!). Then,
the "volts/turn" is the voltage read divided by the number of turns you wound
in. There is USUALLY some "light" showing through the iron core near the
winding; enough to fish through two or four turns. Takes some common sense.


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