RE: [CAD_CAM_EDM_DRO] Two Lamps?

So the current that flows through the LED is _about_ 55V/3,200 Ohms =
0.017A, or 17 mA. Quite reasonable for the LED. But the resistor will
need to dissipate I^2 * R power, or (0.017A)*(0.017A)*(3,200 Ohms) or about
1 watt. This is not your common 1/4 watt resistor... You could use (4) 12
or 13K 1/4 watt resistors in parallel, or better yet (5) 16ishK resistors,
or (6) 20ish K resistors in parallel... you get the idea.

There really should be a power supply FAQ... but unfortunately I don't have
the time to work on one now.

- Steven Ciciora

At 06:36 PM 10/25/2004 +0100, you 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@...]
>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.
>
>
>
>
>
>
>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
>timg@...
>Moderator: pentam@... indigo_red@... davemucha@...
>[Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto:
>aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
>you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
>sister site to the CCED group, as many of the same members are there, for OT
>subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
>DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
>
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
>timg@...
>Moderator: pentam@... indigo_red@...
>davemucha@... [Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects
>goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to
>reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
>sister site to the CCED group, as many of the same members are there, for
>OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
>THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
>
>
>Yahoo! Groups Links
>
>
>
>