RE: [CAD_CAM_EDM_DRO] Two Lamps?

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@...]
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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