Re: Two Lamps?

Thanks Dave, the Led I had bought for this
is rated for regular 110 volt AC.
I figured it would glow at least a little
with the 55 volts DC.
It worked fine straight of a 110 wall outlet.
But I could not get it to work at all with
the Powersupply.

I did not know they only work in one direction
maybe I try this again.

Would I need a resistor for this?


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dave Fisher" <dave@d...>
wrote:

>
> 2 lamps in series would be fine - but when 1 blows / dies both will

go out !

>
> LED's work fine with DC - BUT you do need a series resistor to

limit the

> current to about 10/15 milli Amp
> - a good rule is about 820 Ohms for 12 Volts - So for 55 Volts

3,200 Ohms

> should do the trick.
>
> Remember that LEDS are like diodes - they only work one way round

on DC, so

> if
> it don't work this time - turn the LED connections arround.
>
> One more thing - If you have BIG caps in your power supply the LED

could

> well
> stay on for a LONG time after you ditch the power !
>
> Rgds
>
> Dave Fisher UK
>
>
> -----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.
>
>
>
>
>
>
>
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