Re: [CAD_CAM_EDM_DRO] Re: Voltage Regulators or Diodes to drop voltage?

The easiest way with many transformers would to pull a turn or two
off the secondary. Many if not most secondarys are easy to get too.


Many transformers in this range are designed to be about one volt per
turn.....

Garry

To: CAD_CAM_EDM_DRO@yahoogroups.com
From: "turbulatordude <davemucha@...>"
<davemucha@...>
Date sent: Sat, 11 Jan 2003 18:47:34 -0000
Subject: [CAD_CAM_EDM_DRO] Re: Voltage Regulators or Diodes
to drop voltage?
Send reply to: CAD_CAM_EDM_DRO@yahoogroups.com

> One method is to use an isolation transformer. this would (should
> allow you to drop a couple volts, but it is double parts and it would
> be as big as your current transformer.
>
> I Variac would do the same, but you are again stuck with a double
> unit.
>
> A simple 110vac switcher power supply would allow you to drop your
> voltage a few votls and since you have a tranformer and cap, you
> already have the needed isolation from the noise.
>
> as another idea, a diode in each line would limit the watts disapated
> over multiple devices.
>
> Seesm you got too much of a good thing !
>
> Dave
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "abbylynx <abbylynx@y...>"
> <abbylynx@y...> wrote:
> > Hi again,
> >
> > Well, my linear power supply is working well. Too well in fact..
> > after the bridge recifier and capacitor, it's pumping out 38 volts.
> > This would be fine, only that the maximum voltage limit on my
> driver
> > board is 35V. Aaah!
> >
> > Anyway, I need to drop off about 4V or so, just to be safe. Any
> > advice? I know I could just open the transformer and start taking
> > windings of the secondary, but (A) it's tedious as hell, (B) it's
> > probably defeats the isolation (my duct-taped result would
> certainly
> > not be as isolated as the original) and (C) ... it's just plain not
> a
> > good idea.
> >
> > So I was wondering about other avenues? I'd heard someone talking
> > about using Diodes to drop the voltage on the line? What diodes do
> > you use for this and how many? (I can no longer find the message)..
> I
> > have some diodes around, but they're all meek li'l 1AMP ones,
> they'd
> > certainly become a small short-lived heating element on the 7AMP
> > power supply.
> >
> > Also, what about voltage regulators? I know they don't make
> anything
> > above the 7805 and 7812 (no 7824).. but I know there are variable
> > ones available where you can set the output voltage with a
> resistor.
> > Again, looking on the web I've only been able to find some meek
> li'l
> > 1.5ampers - which'll no doubt be carbon-toasties(tm) by the time my
> > steppers have vamped it. A voltage regulator would seem good -
> since
> > it might just save the driver board in the event of the AC power
> > supply jumping up a few volts in a surge etc.
> >
> > Any advice welcome!
> > Thanks. :)
>
>
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