Cheap Super bright white LEDs
Beau Schwabe
Posts: 6,568
A recent thread Dirt Cheap bright LEDs for sale!! got me curios on a string of white LED Christmas lights that I got a deal on a last year after Christmas sale.
I purchased a a few strings of 120 LED's for $6 ... $0.05 per LED. The LED's are quite happy at about 10 mA with a forward voltage of about 2.9V
If you don't mind a little grunt work of removing the LED's (some are a little stubborn) this is not a bad source for LED's
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
I purchased a a few strings of 120 LED's for $6 ... $0.05 per LED. The LED's are quite happy at about 10 mA with a forward voltage of about 2.9V
If you don't mind a little grunt work of removing the LED's (some are a little stubborn) this is not a bad source for LED's
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
800 x 600 - 74K
800 x 600 - 72K
800 x 600 - 68K
800 x 600 - 66K
Comments
I haven't spotted those in the after Christmas sales, but hopefully this year
will be my year to stock up. [noparse]:)[/noparse]
OBC
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I have use these·LEDs in my yard· and find that they did not last very long about 8 months or so
Yes they·are cheep per LED
Now mind you I did not use a voltage regulator on these LEDs
I·also I·ran them on AC voltage
·I had·4 white LEDs to 12 volts or a little more ·I ran them at 15 to 18·mill-amps other wise they are not very bright
I have still 6 Boxes of them I have not used any more of them yet until I find a way to use them where they last longer that 8 months
I thought about running them with a switching 3.3 volt regulator and see if they will last longer
Where do I find Red and Black Zip cord that is made for out door use to do this set up
I hope this helps
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Sam
Post Edited (sam_sam_sam) : 10/19/2009 11:28:52 PM GMT
Too bad they are only 90V I wanted to rectify 110V AC and use a string of them however as i was wondering in the car this morning, if you use this device as a source to ground then the string of led's would drop the voltage
and you could run any voltage as long as the string of led's dropped the voltage to below 90 at the CL2N3.
Yes? No?
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Think Inside the box first and if that doesn't work..
Re-arrange what's inside the box then...
Think outside the BOX!
Too bad they are only 90V I wanted to rectify 110V AC·
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You can Just use a resister that will give you·a 50 ·volt drop·I would use 120 v AC value instead of 110 volt AC
·I would drop the Voltage to maybe to about 70 volts for some lead way
Yes I will give this a try and see how this will work Thanks for sharing this part and where to to get some
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··Thanks for any·
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Sam
Post Edited (sam_sam_sam) : 10/19/2009 11:47:50 PM GMT
AC and LED's are funny, especially mains AC. The reverse voltage breakdown usually kills LED's very quickly as well does in-rush current.
The attached circuit is basically what's driving the 120 LED string... the circuit only shows a driver for 60 LEDs, but there are two of them in this application.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
I use a bridge rectifier to convert to DC. Here is a light bulb I did with 20 white LED's and a rectifier with one small resistor
Actually these boards fit a dip switch and a header pin for a DMX controller I made. I had them made in china so I have over a hundred boards and just stuck them together to make a square light bulb. I used one of those edison socket to plug adaptors in the light bulb socket and then used a plastic plug used for the end of a lamp as a plug in light bulb connector.
I have had that thing in this lamp for over a year and use it every day.
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Think Inside the box first and if that doesn't work..
Re-arrange what's inside the box then...
Think outside the BOX!
Post Edited (metron9) : 10/20/2009 5:01:26 AM GMT
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propmod_us and propmod_1x1 are in stock. Only $30. PCB available for $5
Want to make projects and have Gadget Gangster sell them for you? propmod-us_ps_sd and propmod-1x1 are now available for use in your Gadget Gangster Projects.
Need to upload large images or movies for use in the forum. you can do so at uploader.propmodule.com for free.
The LEDs are interesting in that they are cylindrical in shape - they light up well with 3.3v and a 1k resistor.
Rich H
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The Simple Servo Tester, a kit from Gadget Gangster.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
Ken Gracey
have an interesting effect of light being largely seen from the sides while looking dead into the top, you see a
small lit circle with a dot in the center. Much to the dismay of my spouse I've already disassembled them and
created a tray of 50 LED's. [noparse]:)[/noparse]
The included $10.00 coupon off my next purchase of $50 or more will come in handy in January
when I hopefully find these at 1/2 price. [noparse]:)[/noparse]
OBC
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New to the Propeller?
Visit the: The Propeller Pages @ Warranty Void.
I just use a 10K resistor on the prop protoboard to get a nice visible led at night. Daylight is a little harder to see pulses, so I place a little paper cover over it. A 1K to 4K7 resistor would work much better, but hey, the 10K were on the pcb for the mouse pullups
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Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)
· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm