On Thursday, November 1, 2018 at 10:34:09 PM UTC-4, Jeff Liebermann wrote:
> On Thu, 1 Nov 2018 10:09:11 -0700 (PDT),
> gnuarm.deletethisbit@gmail.com wrote:
>
> >On Thursday, November 1, 2018 at 12:52:09 AM UTC-4, Jeff Liebermann wrote:
> >> Several people were nice
> >> enough to find LED's that will work without additional parts. However,
> >> they're difficult to find in the US, making this a procurement
> >> exercise, instead of an engineering challenge. I'm now waiting for
> >> some parts to arrive.
>
> >Digikey isn't easy enough? Stock, $21.26 for 100 plus postage.
> >Rick C.
>
> <https://www.digikey.com/products/en?keywords=WP937GGD>
> On order from Digikey as of two days ago. I'm told that there are
> some packages waiting for me in my office. I'm expecting the above
> green-green 3mm LED, some green-red flashing 3mm LED's I ordered by
> accident, and some SMD 0805 green LED's to try connecting back to back
> across the existing LED. With all the possible choices, something is
> sure to work.
>
> Also, I've been busy for the last 4 days and didn't have a chance to
> thank you for noticing the change in Kingbright part number between
> international and US catalogs, and the lack of a proper description in
> both Digkey and Mouser. The Digikey web page now shows
> "bi-directional" instead of "conventional". I don't think I would
> have found the part without your help. Thanks.
Digikey is pretty responsive to correction suggestions. I pointed out to them the error, not only on their web site, but in the manufacturer's data sheet. The real trick will be getting Kingbright to fix that short coming. I think Digikey must have an engineer on their staff working these issues because this person was able to read the data sheet and see the same thing I did, no description, but the bi-directional schematic.
This is a small payback for all the great help you have posted to the group and in particular to me. I only wish you were local so I could bring you my computer problems. Sometimes I hate working on them.
Rick C.
Reply by Jeff Liebermann●November 1, 20182018-11-01
On Thu, 1 Nov 2018 10:09:11 -0700 (PDT),
gnuarm.deletethisbit@gmail.com wrote:
>On Thursday, November 1, 2018 at 12:52:09 AM UTC-4, Jeff Liebermann wrote:
>> Several people were nice
>> enough to find LED's that will work without additional parts. However,
>> they're difficult to find in the US, making this a procurement
>> exercise, instead of an engineering challenge. I'm now waiting for
>> some parts to arrive.
>Digikey isn't easy enough? Stock, $21.26 for 100 plus postage.
>Rick C.
<https://www.digikey.com/products/en?keywords=WP937GGD>
On order from Digikey as of two days ago. I'm told that there are
some packages waiting for me in my office. I'm expecting the above
green-green 3mm LED, some green-red flashing 3mm LED's I ordered by
accident, and some SMD 0805 green LED's to try connecting back to back
across the existing LED. With all the possible choices, something is
sure to work.
Also, I've been busy for the last 4 days and didn't have a chance to
thank you for noticing the change in Kingbright part number between
international and US catalogs, and the lack of a proper description in
both Digkey and Mouser. The Digikey web page now shows
"bi-directional" instead of "conventional". I don't think I would
have found the part without your help. Thanks.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Reply by ●November 1, 20182018-11-01
On Thursday, November 1, 2018 at 12:52:09 AM UTC-4, Jeff Liebermann wrote:
> On Thu, 1 Nov 2018 11:28:43 +1100, Robert Martin <rmartin@bristol.edu>
> wrote:
>
> >RGB LED?
> >https://www.amazon.com/3mm-rgb-led/s?page=1&rh=i%3Aaps%2Ck%3A3mm%20rgb%20led
> >Robert Martin
>
> Thanks, but no. It won't work. Same problem as a bi-color LED.
> There's no easy way for it to EASILY fit into the relay enclosure,
> operate on 24VDC with any polarity, and always show green, without
> adding additional diodes and resistors. Several people were nice
> enough to find LED's that will work without additional parts. However,
> they're difficult to find in the US, making this a procurement
> exercise, instead of an engineering challenge. I'm now waiting for
> some parts to arrive.
Digikey isn't easy enough? Stock, $21.26 for 100 plus postage.
Rick C.
Reply by Jeff Liebermann●November 1, 20182018-11-01
On Thu, 1 Nov 2018 11:28:43 +1100, Robert Martin <rmartin@bristol.edu>
wrote:
Thanks, but no. It won't work. Same problem as a bi-color LED.
There's no easy way for it to EASILY fit into the relay enclosure,
operate on 24VDC with any polarity, and always show green, without
adding additional diodes and resistors. Several people were nice
enough to find LED's that will work without additional parts. However,
they're difficult to find in the US, making this a procurement
exercise, instead of an engineering challenge. I'm now waiting for
some parts to arrive.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Reply by Robert Martin●October 31, 20182018-10-31
On 28/10/18 4:05 am, Jeff Liebermann wrote:
> On 24 Oct 2018 17:15:19 -0700, Winfield Hill
> <hill@rowland.harvard.edu> wrote:
>
>> Jeff Liebermann wrote...
>>>
>>> Is there such a thing as a bi-directional LED where each
>>> polarity is the same color?
>>
>> https://www.manufacturer.lighting/info/64/
>
>> AC LEDs, with two sets of back-to-back LEDs, are available
>> for high-voltage high-light-level LED assemblies. For low
>> light levels running from AC, people just use a back diode
>> and run the LED half-cycle at 60, etc., rather than 120Hz.
>
> Thanks. Sorry for the delayed reply.
>
> All the "AC LED" hints under the above description seem to be
> 117/220VAC powered and seem to refer to much larger light bulbs and
> strips.
>
> There's very little room for a diode bridge or a 2nd LED. The only
> way I could make that happen is to redesign and 3D print a new white
> plastic LED frame. The plastic is there to provide voltage isolation
> between the solenoid wires and the relay contacts and frame:
> <http://www.learnbydestroying.com/jeffl/crud/Omron%20relay.jpg>
> I could cram a small SMD bridge along the side of the relay but would
> require precision soldering under a microscope, and is too much work.
> Similarly, I tried to replace the 3mm LED with two parallel SMD LED's.
> It worked, but again required too much work. The typical 20 degree
> viewing angle was also too small.
>
> Your suggestion of searching for an AC LED
> <https://www.google.com/search?q=%22AC+LED%22+3mm+green>
> found only one available product that is green in both directions and
> is exactly what I'm looking for:
> <https://www.rapidonline.com/pdf/56-2308.pdf>
> Ebay has some in the UK:
> <https://www.ebay.com/itm/TruOpto-OSGGD23131E-3mm-Pure-Green-Ac-LED-10000MCD-30/132604396903>
> $3.50/ea plus shipping from UK is rather expensive. The best I could
> do is $0.125/ea plus VAT and shipping from UK:
> <https://www.rapidonline.com/truopto-osggd23131e-3mm-pure-green-ac-led-10000mcd-30--56-2308>
> However, they only have 18 in stock and do not plan to order more.
>
> So, I decided to take the easy way out and simply order some bi-color
> 3mm LED's and deal with the inevitable confusion when it arrives.
> <https://www.ebay.com/itm/121748773460>
> $9/100 pcs.
>
>
>
On Tuesday, 30 October 2018 13:24:29 UTC, speff wrote:
> On Monday, 29 October 2018 22:51:27 UTC-4, Jeff Liebermann wrote:
> > On Tue, 30 Oct 2018 02:16:22 +0000 (UTC), sceptre@sdf.lonestar.org
> > wrote:
> >
> > >Also Lumex SSL-LX5093GGD:
> > >https://www.lumex.com/C060207P04.html#start
> > >(see Bipolar section)
> > >
> > >Only stock is at Heilind:
> > >https://estore.heilind.com/SSL%2DLX5093GGD/LMXSSL%2DLX5093GGD.html
> >
> > Thanks, but the above Lumex LED is 5mm and I need 3mm. It's to
> > replace the green LED in this relay:
> > <http://www.learnbydestroying.com/jeffl/crud/Omron%20relay.jpg>
> >
>
> (perhaps) interestingly, bipolar same-color LEDs seem to be pretty available off the shelf in China, in smallish quantities (eg. a bag of 1K). For example, diffuse blue-blue 3mm. Maybe nobody wants to bother exporting them for onesy-twosy customers who come along once in a 蓝色 moon.
>
> --sp
I was just thinking if you can't get em here, maybe time to look at some of the less trusted foreign suppliers.
I'd also be very tempted to just stick a couple of sm leds in there back to back. The white plastic should distribute the light passably well.
NT
Reply by Dimitrij Klingbeil●October 30, 20182018-10-30
Thanks, but the above Lumex LED is 5mm and I need 3mm. It's to
>> replace the green LED in this relay:
>> <http://www.learnbydestroying.com/jeffl/crud/Omron%20relay.jpg>
>>
>
> (perhaps) interestingly, bipolar same-color LEDs seem to be pretty
> available off the shelf in China, in smallish quantities (eg. a bag
> of 1K). For example, diffuse blue-blue 3mm. Maybe nobody wants to
> bother exporting them for onesy-twosy customers who come along once
> in a 蓝色 moon.
Most likely they are built there by the *illion and put into household
goods in large quantities as mains power indicators instead of the old
neon glowlamps.
A bidirectional same color led with a resistor is probably the cheapest
mains indicator you can make that would not be actively irritating.
Anything less means using a single polarity led, and that flickers so
ghastly that even the most insensitive customers will complain. Also,
it loses brightness quickly because of reverse voltage breakdown every
other mains cycle.
Reply by ●October 30, 20182018-10-30
On Monday, October 29, 2018 at 11:59:04 PM UTC-4, gnuarm.del...@gmail.com wrote:
I filed a correction request with Digi-key and they notified me the listing has been corrected to be displayed on the next website update. :)
Now how many other such LEDs are mislabeled on the website because the maker doesn't list them as bi-polar or bi-color?
Rick C.
Reply by speff●October 30, 20182018-10-30
On Monday, 29 October 2018 22:51:27 UTC-4, Jeff Liebermann wrote:
(perhaps) interestingly, bipolar same-color LEDs seem to be pretty available off the shelf in China, in smallish quantities (eg. a bag of 1K). For example, diffuse blue-blue 3mm. Maybe nobody wants to bother exporting them for onesy-twosy customers who come along once in a 蓝色 moon.
--sp
Reply by ●October 30, 20182018-10-30
SunLED has a family of Bi-Polar (two-lead) 3mm LEDs, including
Green/Green:
https://www.sunledusa.com/productSeries.aspx?ser=XLxxxx37x
Octopart claims to know the part numbers, but no distributors found.
Since you have some time, you could ask SunLED whether these are vaporware
or just stocked in strange places.
--
sceptre@sdf.org
SDF Public Access UNIX System - http://sdf.org