Re: [CAD_CAM_EDM_DRO] Best way to vary output of 24V transformer?

In a message dated 27-Aug-01 00:57:58 Central Daylight Time,
don.pat.brock@... writes:

> Would I simply be able to use a light dimmer on the 110V side of the
> transformer to vary the output voltage? I've never tried this and
> would have to purchase the dimmer switch.
>
>

Don: The "hash" created by the "chopping" a solid-state dimmer-switch for a
room-light creates may-well adversely affect the power-supply, particularly
the regulator-part. It may be just a simple Darlington configuration, but it
may also be one of the "three-terminal variable-regulators" such as the
LM-317, etc.

If I were going to use the approach you suggest here, I would us a
variable-transformer on the PRIMARY, varying the AC-line input from, say, 50
to 120 VAC. The output of a variable transformer is a sine-wave, not
"chopped".

If you ever have opportunity to "look at" the output of one of those
solid-state lamp-dimmers feeding a light-bulb, on an oscilloscope, DO! It
will blow your mind! Ever notice how fast the bulbs die, when "dimmed" by
one of those? Know why, now???

Jan Rowland, Troll


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