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PICList Thread
'Strobes'
1998\10\27@155417 by Andy Kunz

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Does anybody know of any small (handheld) commercial strobes?  I need
something that's no bigger than a medium-sized DMV which has an adjustable
frequency light.  It doesn't need to be especially bright, as it's
primarily for indoor use.

I need to see if a rotating wheel is running true.  Speed would be a few
hundred RPM to up to 60K, but I don't expect that in one package.

Thanks.

Andy

==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\10\27@162604 by John Kirk

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I've heard, but not seen, the use of a big LED and standard frequency
generator to make a tiny strobe.   They do things like "stop" the stream
coming from an ink jet printer.   Its not very bright, but you can probably
get up 60KHz with most LED's.  Good luck: John Kirk

> {Original Message removed}

1998\10\27@165802 by Reginald Neale

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Andy asked:

>Does anybody know of any small (handheld) commercial strobes?  I need
>something that's no bigger than a medium-sized DMV which has an adjustable
>frequency light.  It doesn't need to be especially bright, as it's
>primarily for indoor use.
>
>I need to see if a rotating wheel is running true.  Speed would be a few
>hundred RPM to up to 60K, but I don't expect that in one package.
>

I think you can do this with a PIC. The new white LEDs are very, very
bright. These are the ones with a single junction, not the ones with three
RGB diodes. I've pulsed them at rates that would equate to a few hundred
RPM. Make a PIC-based variable pulse-rate, LCD readout, penlight size
timing light....

Reg Neale

1998\10\27@170418 by Steve Becker

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Andy,

I remember trying some HP solid state lamps (LEDs) that they call super
ultrabright lamps.  It can project a red dot 10 feet away.  I believe is
called HLMP-8115 which has 1200mcd output.

If you can use this, the drive circuit will be a lot simplier.  Hope it
helps.

Steve becker

John Kirk wrote:
>
> I've heard, but not seen, the use of a big LED and standard frequency
> generator to make a tiny strobe.   They do things like "stop" the stream
> coming from an ink jet printer.   Its not very bright, but you can probably
> get up 60KHz with most LED's.  Good luck: John Kirk
>
> > {Original Message removed}

1998\10\27@170700 by Steve Becker

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Hello, Reg,

Where can you buy this white LED??  I have never heard of a white LED
before, must cost a fortune!  Sure like to try.

Thanks.

Steve Becker


Reginald Neale wrote:
{Quote hidden}

1998\10\27@174455 by kotay

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>
> Andy,
>
> I remember trying some HP solid state lamps (LEDs) that they call super
> ultrabright lamps.  It can project a red dot 10 feet away.  I believe is
> called HLMP-8115 which has 1200mcd output.
>
> If you can use this, the drive circuit will be a lot simplier.  Hope it
> helps.
>
> Steve becker
>
Speaking of bright LED's, I just picked one up at Radio Shack.
Part # 276-206, orange (620nm) 10mm LED, 12000mcd brightness!
It is too bright to look into for more than a second and
projects a 1-2" spot at 1 meter.  The spot is visible for at
least 2 meters, depending on the brightness of the room
illumination.  I was running it at ~23 mA (12000mcd is at
20 mA), although the max continuous current is 50 mA (100 mA
peak).

Keith D. Kotay
Dartmouth College
spam_OUTkotayTakeThisOuTspamcs.dartmouth.edu
http://www.cs.dartmouth.edu/~kotay

> John Kirk wrote:
> >
> > I've heard, but not seen, the use of a big LED and standard frequency
> > generator to make a tiny strobe.   They do things like "stop" the stream
> > coming from an ink jet printer.   Its not very bright, but you can probably
> > get up 60KHz with most LED's.  Good luck: John Kirk
> >
>

1998\10\27@182928 by WIL REEDER

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Hi Steve & Andy----------
White leds I have are made by LEDTRONICS and purchased from Jade Mountain.
They are very bright, painfull to look at, I would estimate 3-5k mcd. Both
firms have websites, Jade is mostly packaged lights
good luck!

Wil Reeder
Vancouver, Canada
.....teachtechKILLspamspam@spam@bc.sympatico.ca

{Quote hidden}

1998\10\27@184801 by Peter Grey

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At 03:30 PM 27/10/98 -0800, you wrote:

I have been looking for white LED's but in surface mount. They are to be
used for a scanning device to provide illumination. Has anyone seen
something like this? They should be as bright as possible.


TIA


Peter Grey
Neosystems, Australia

{Quote hidden}

1998\10\27@193134 by kotay

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>
> At 03:30 PM 27/10/98 -0800, you wrote:
>
> I have been looking for white LED's but in surface mount. They are to be
> used for a scanning device to provide illumination. Has anyone seen
> something like this? They should be as bright as possible.
>
> TIA
>
> Peter Grey
> Neosystems, Australia
>
Digi-Key CMD1424WCNCT-ND while LED made by Chicago Miniature
Lamp, Inc.  Continuous current 25mA, peak current 80mA,
75mcd.  5.64 USD for 1, 52.17 USD for 10, 468.12 USD for 100.
CML part number CMD1424WCN.

Keith D. Kotay
Dartmouth College
KILLspamkotayKILLspamspamcs.dartmouth.edu
http://www.cs.dartmouth.edu/~kotay

1998\10\27@194139 by Peter Grey

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At 07:20 PM 27/10/98 -0500, you wrote:
>>
>> At 03:30 PM 27/10/98 -0800, you wrote:
>>
>> I have been looking for white LED's but in surface mount. They are to be
>> used for a scanning device to provide illumination. Has anyone seen
>> something like this? They should be as bright as possible.
>>
>> TIA
>>
>> Peter Grey
>> Neosystems, Australia
>>
>Digi-Key CMD1424WCNCT-ND while LED made by Chicago Miniature
>Lamp, Inc.  Continuous current 25mA, peak current 80mA,
>75mcd.  5.64 USD for 1, 52.17 USD for 10, 468.12 USD for 100.
>CML part number CMD1424WCN.

OUCH! For each scanner I need about 50 LED's.

Thanks for the info.


Peter

>Keith D. Kotay
>Dartmouth College
>RemoveMEkotayTakeThisOuTspamcs.dartmouth.edu
>http://www.cs.dartmouth.edu/~kotay
>
>

1998\10\27@220126 by Reginald Neale

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>Hello, Reg,
>
>Where can you buy this white LED??  I have never heard of a white LED
>before, must cost a fortune!  Sure like to try.
>
>Thanks.

Steve:

Yes, they are expensive. As I remember, $4-5USD. But there are some places
where you just have to have white light. I think these were from
Alltronics. If you can't find them, email me tomorrow when I'm at work and
I'll look it up.

My understanding is that the principle of operation is IR LED illuminating
a tiny internal phosphor screen. I bought four of them and they varied in
brightness. The brightest one was blinding at 10 mA.

Reg

1998\10\27@221820 by jamesp

picon face
You can also get a White light LED from Digi-Key.  I'm not sure of the part
number right off hand, but I remember they actually contain 4 LED's in the
same package.  You send different currents to each of the individual LED's,
and this would mix the primary colors so you could have any color from
white to black.  I believe the cost was about $4-5 US.  DigikEy's Phone
number is 1-800-DIG-IKEY

----------
{Quote hidden}

places
> where you just have to have white light. I think these were from
> Alltronics. If you can't find them, email me tomorrow when I'm at work
and
> I'll look it up.
>
> My understanding is that the principle of operation is IR LED
illuminating
> a tiny internal phosphor screen. I bought four of them and they varied in
> brightness. The brightest one was blinding at 10 mA.
>
> Reg

1998\10\27@223926 by Dennie Lee

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...SNIP!...
>>Digi-Key CMD1424WCNCT-ND while LED made by Chicago Miniature
>>Lamp, Inc.  Continuous current 25mA, peak current 80mA,
>>75mcd.  5.64 USD for 1, 52.17 USD for 10, 468.12 USD for 100.
>>CML part number CMD1424WCN.
>
>OUCH! For each scanner I need about 50 LED's.
>
>Thanks for the info.
>
>
>Peter
>
>>Keith D. Kotay
>>Dartmouth College
>>RemoveMEkotayspamTakeThisOuTcs.dartmouth.edu
>>http://www.cs.dartmouth.edu/~kotay
>>

Ever thought about cold cathode flourescent?  Would certainly be more cost
effective!


-- Dennie Lee --
dwlee1EraseMEspam.....bbtel.com                ICQ: 19351768
http://www.uofl.edu/~dwlee001  <- Being Rebuilt

1998\10\28@004354 by Mark Willis

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Reginald Neale wrote:
>
> ...
> My understanding is that the principle of operation is IR LED illuminating
> a tiny internal phosphor screen. I bought four of them and they varied in
> brightness. The brightest one was blinding at 10 mA.
>
> Reg

 Does anyone know how fast that phosphor is?

 If it's a really slow phosphor, you're going to have bad problems
using one of these as a strobe, obviously!

 Thought I'd ask. (Also I second the use of the Radio Shack LED's -
they have Red 5000mcd IIRC, Yellow 8000 mcd units also, though it IS
Radio Shack, and you can't always guarantee they'll have 'em in stock.
I have a local store where I know the purchasing agent, she stocks
anything I need, I just have to give her a call in advance & Jody calls
me when it's in...)  Think a LED flashlight on these things - I'm
considering an array of 15 for a wheelchair headlight with ultra long
life & no chance of vibration breaking the filamnts.  You DO need to
keep the lens clean or you'll reduce light output by up to 50%...

 Mark, EraseMEmwillisspamnwlink.com

1998\10\28@052008 by Octavio Nogueira

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>Does anybody know of any small (handheld) commercial strobes?  I need
>something that's no bigger than a medium-sized DMV which has an adjustable
>frequency light.  It doesn't need to be especially bright, as it's
>primarily for indoor use.
>
>I need to see if a rotating wheel is running true.  Speed would be a few
>hundred RPM to up to 60K, but I don't expect that in one package.
>
>Thanks.
>
>Andy
>
>==================================================================
>Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
>==================================================================

Hi Andy,
This is a good PIC project, as a matter of fact I developed one once, it was
smaller than a DMV and used an VCO (I think 4046) a ultra-bright LED and
a PIC to read the frequency and show on a 7 segment display. It worked
very well.

Regards,

Octavio
=======================================================
Octavio Nogueira - RemoveMEnogueiraEraseMEspamEraseMEmandic.com.br ICQ# 19841898
>From the creator of ProPic,   ProPic 2  now much better
*        http://members.tripod.com/ProPic             *
* PIC Programmer for Windows with down to earth price *
=======================================================

1998\10\28@102113 by Andy Kunz

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At 02:09 PM 10/27/98 -0700, you wrote:
>don't they just use an inductive pickup to cause the strobe?  So....just
>trigger from a different source? I dunno....just throwing out ideas.

I'm looking for something small, much smaller than a car's.  I need to
flash on a 1/8" dia shaft turning 1K-60K RPM with a propeller 1.25" dia.

Strobe will be synched either by an IR detector to get a fixed position, or
by a pot to allow me to set a speed other than that at which it is turning
(looking for it to be out of balance).

Andy


==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\10\28@104157 by Steve Becker

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Hi, all

$5.64 for 75 mcd of white light is expensive, isn't it?  I was thinking
of like 1000-5000 mcds!  May be have to wait a few years for technology
to pick up and by then I wound have saved enough money to try one out.

Steve


RemoveMEkotayspam_OUTspamKILLspamAHWANEE.CS.DARTMOUTH.EDU wrote:
{Quote hidden}

1998\10\28@105231 by Steve Becker

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Reg,

Thanks for the info.  I looked up my All Electronics catalog, can't see
any white there.  may be the Alltronics you mentioned is different than
the one I have.

Please give a web reference or something.  Thanks again.

Steve


Reginald Neale wrote:
{Quote hidden}

1998\10\28@111521 by Brian Watson

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Steve

The Hewlett Packard HLMP-DG08 gives 6500mcd of 626nm (red) light at 20mA.
Its viewing angle is only 6 degrees!  It costs only 0.36 pound(UK) each for
5.

Brian

{Original Message removed}

1998\10\28@112316 by Jay Couture

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At 10:51 AM 10/28/98 -0500, you wrote:
>Hi, all
>
>$5.64 for 75 mcd of white light is expensive, isn't it?  I was thinking
>of like 1000-5000 mcds!  May be have to wait a few years for technology
>to pick up and by then I wound have saved enough money to try one out.
>
>Steve
>

www.realcat.com/realcat0822/display/ItemDetails.cgi?ManId=allec&ItemI
d=LED%2D48

1998\10\28@130611 by William Chops Westfield

face picon face
   $5.64 for 75 mcd of white light is expensive, isn't it?  I was thinking
   of like 1000-5000 mcds!

Note that the mcd rating of LEDs is highly dependent on radiation pattern
and (designed) viewing angle.  The same super-bright LED chip that powers
radio-shacks 12000mcd wonder will end up with a lower rating if you put it
in a different package, and the surface mount parts always seem to have a
much lower rating than the T1 3/4 parts that have "room" for a big lense.

BillW

1998\10\28@133936 by John Payson

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>>QUOTING>>
 Thought I'd ask. (Also I second the use of the Radio Shack LED's -
they have Red 5000mcd IIRC, Yellow 8000 mcd units also, though it IS
Radio Shack, and you can't always guarantee they'll have 'em in stock.
I have a local store where I know the purchasing agent, she stocks
anything I need, I just have to give her a call in advance & Jody calls
me when it's in...)  Think a LED flashlight on these things - I'm
considering an array of 15 for a wheelchair headlight with ultra long
life & no chance of vibration breaking the filamnts.  You DO need to
keep the lens clean or you'll reduce light output by up to 50%...
<<ENDQUOTE<<

One "feature" with LED illumination that makes it very
good for some applications but not so good for general
purpose illumination is that the light is nearly mono-
chromatic (white LED's excepted).  Although shining a
yellow LED on a white surface may produce illumination
that LOOKS about the same as red+green, it's almost im-
possible to see the color of objects lit with the single
LED.

It's possible that using red+yellow+orange would provide
enough different wavelengths of light to provide some
useful color perception, but I would not rely on any
single LED color to do so.

PS--I think I found another thingie I needed to uncheck
in Messysoft OutToLunch.  Is the WINMAIL.DAT thing gone
(at last)?

1998\10\28@164257 by Sean Breheny

face picon face
>PS--I think I found another thingie I needed to uncheck
>in Messysoft OutToLunch.  Is the WINMAIL.DAT thing gone
>(at last)?
>

YESSSSSS! Thank you John!

Sean

+-------------------------------+
| Sean Breheny                  |
| Amateur Radio Callsign: KA3YXM|
| Electrical Engineering Student|
+-------------------------------+
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
EraseMEshb7spamspamspamBeGonecornell.edu  Phone(USA): (607) 253-0315 ICQ #: 3329174

1998\10\28@170748 by Reginald Neale

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>
>PS--I think I found another thingie I needed to uncheck
>in Messysoft OutToLunch.  Is the WINMAIL.DAT thing gone
>(at last)?

Looks good on my machine, John. No binary and no attachment.

Reg

1998\10\28@175214 by Mark Willis

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John Payson wrote:
> <snipped my stuff out>
> One "feature" with LED illumination that makes it very
> good for some applications but not so good for general
> purpose illumination is that the light is nearly mono-
> chromatic (white LED's excepted).  Although shining a
> yellow LED on a white surface may produce illumination
> that LOOKS about the same as red+green, it's almost im-
> possible to see the color of objects lit with the single
> LED.
>
> It's possible that using red+yellow+orange would provide
> enough different wavelengths of light to provide some
> useful color perception, but I would not rely on any
> single LED color to do so.
>
> PS--I think I found another thingie I needed to uncheck
> in Messysoft OutToLunch.  Is the WINMAIL.DAT thing gone
> (at last)?

 WINMAIL.DAT is toast! <G>  You got the right check box.  Great!

 For Robin's wheelchair, having her avoid chuckholes (which'll break
wheelchair frames) and broken glass (which'll hurt tires & hound feet),
and avoiding running off curbs or into curbs, is quite fine (Her chair
moves at a BRISK pace at full throttle, slow to medium run speed
actually!  Fast puppy!  She gets Zeuss running pretty hard on the 5
blocks from here to her church, not quite full speed but 80% or so.)

 She needs illumination to see, but I'm not sure that she cares what
color of dirt or concrete or asphalt she's running over <G>

 Not a bad idea to go white, though, or white for close up with orange
"fog lighting" for distance vision...  Sure would help the power budget
compared to a car fog light <G>

 And in field tests, we may find that she doesn't like orange LED
lighting at all.  In which case "back to the drawing screen" <G>

 (someone mentioned HP White LED's - another thing for me to look for -
Great!)

 Mark, RemoveMEmwillisKILLspamspamnwlink.com

1998\10\29@132142 by Peter L. Peres

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> WINMAIL.DAT gone ?

Yes ! Thanks you !

Peter

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