Re: [CAD_CAM_EDM_DRO] Re: Two Lamps?

I seem to recall something like this on a forced commutation cap bank on a
SCR switcher (1000V 1000A).

Remember the resistance changes as the current flow increases.

If the hot filiment of one bulb draws less than current level to heat the
second bulb to incandence then only one will light, probably n random
sequence each time you power up.

I think thats right. Been a long day

Hugh

----- Original Message -----
From: "Tom Hubin" <thubin@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, December 14, 2004 8:32 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Two Lamps?


>
>
>
> -----Original Message-----
> From: Torsten <torsten@...>
> Sent: Dec 14, 2004 1:40 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Two Lamps?
>
>
>
> > > -----Original Message-----
> > > From: Torsten [mailto:torsten@g...]
> > > Sent: 25 October 2004 18:17
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: [CAD_CAM_EDM_DRO] Two Lamps?
> > >
> > >
> > >
> > >
> > > Got a question, I have a Powersupply
> > > delivering 55 volts DC in my driverbox
> > > connected to a Caps to store and smuth
> > > out the current having been zapped a few
> > > times I would like to hook up a little
> > > light bulb to drain out the current after
> > > it is shut off.
> > > Would also be nice for the visual feedback
> > > to see when the thing is charged.
> > >
> > > On the first attempt I learned that a Led dose
> > > not work with DC current.
> > >
> > > So now I am Looking at some Bulbs with a filament.
> > > What I found is a "Miniature Bayonet base Lamp"
> > > rated for 28 volt .040 amps I belive I should be
> > > able to wire two of them in serial to make it work
> > > on my 55 volt system.
> > >
> > > Will this work?
> > > Any thoughts, please share.
> > >
> > >
>
> Finally got the bulbs this week and tryed them out.
> It worked sort of, the Light drained the power after
> about one minute or so just what I wanted.
> Strange thing is only one of the bulbs lighted up the
> other one did not seam to be on.
> Because they where wired in series I know electricity
> must have gone through both of them.
> What is going on, anybody know why only one light was on?
> How do I fix it.
>
> *****************
>
> Sounds like the two bulbs are not the same type. Are the two bulbs the
same voltage and power rating? Try measuring the resistance of each with an
ohmmeter. Should be the same resistance, within 10% anyway.
>
> Tom Hubin
> thubin@...
>
>
>
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