Re: [CAD_CAM_EDM_DRO] 24v transformer

Chris:

If the copper is wound on a "bobbin", you could easily remove a few turns of
the secondary (the thicker wire. The primary would be THINNER wire). If,
however, the windings are "form wound" and covered with paper, this would be
very difficult and quite likely dangerous (to you AND the transformer!),
particularly if you are not an experienced "transformer man".

An alternative, IF there is some "room" for more copper between the windings
and the iron: Wind some turns of copper wire (try five turns to start?)
(same wire-ga. as the secondary, if you can SEE the ends of that), being
careful not to scratch-off the insulation asyou thread the wire through, and
wire that coil in series with the secondary. See if the voltage is less. If
HIGHER, swap-ends, and test again. You want to read 20 or 21 VAC, with a
load (say try a 20 ohm, 25 W. resistor as a load for testing). You may find
you want only THREE turns, or TEN, or whatever number. But note: You can
NOT make any sense out of these measured AC voltages unless you LOAD the
transformer with a resistor or lamp or whatever, as I suggest. Preferably,
some load that would draw about the same current as the steppers and driver
you intend to use with this.

Jan Rowland


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