Subject: Re: [Healeys] LED polarity

From: Oudesluys <[email-masked]>
Date: Mon, 29 Feb 2016 18:33:22 +0100

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A LED light acts as a diode. If you have the wire connected the wrong 
way round the lights will not work but no harm will be done if connected 
for a few seconds and probably neither if it is longer than that.
Kees Oudesluijs

Op 29-2-2016 om 18:13 schreef Michael Oritt:
> This really is not a car-related question though I guess we could make 
> it into one:
>
> I have some 24VDC outdoor LED lighting and the wall-plug type 
> transformer is defective.  I cannot determine which of the two fine 
> wires that run to the appliance (LED's) is positive.  I can find a 
> replacement transformer online.
>
> Here's the question:  I understand that LEDs are polarity-sensitive 
> and if I wire them up backwards will I destroy the LEDs or can I 
> simply reverse the polarity?
>
> Best--Michael Oritt
>
>
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> Geen virus gevonden in dit bericht.
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> Versie: 2016.0.7442 / Virusdatabase: 4537/11717 - datum van uitgifte: 
> 02/28/16
>

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    <div class="moz-cite-prefix">A LED light acts as a diode. If you
      have the wire connected the wrong way round the lights will not
      work but no harm will be done if connected for a few seconds and
      probably neither if it is longer than that.<br>
      Kees Oudesluijs<br>
      <br>
      <br>
      Op 29-2-2016 om 18:13 schreef Michael Oritt:<br>
    </div>
    <blockquote
cite="mid:CAPTa0B7jbrg=[email-masked]"
      type="cite">
      <meta http-equiv="Context-Type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default">This really is not a car-related
          question though I guess we could make it into one:</div>
        <div class="gmail_default"><br>
        </div>
        <div class="gmail_default">I have some 24VDC outdoor LED
          lighting and the wall-plug type transformer is defective.  I
          cannot determine which of the two fine wires that run to the
          appliance (LED's) is positive.  I can find a replacement
          transformer online. </div>
        <div class="gmail_default"><br>
        </div>
        <div class="gmail_default">Here's the question:  I understand
          that LEDs are polarity-sensitive and if I wire them up
          backwards will I destroy the LEDs or can I simply reverse the
          polarity?</div>
        <div class="gmail_default"><br>
        </div>
        <div class="gmail_default">Best--Michael Oritt</div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
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</pre>
      <br>
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      <p class="">Geen virus gevonden in dit bericht.<br>
        Gecontroleerd door AVG - <a moz-do-not-send="true"
          href="http://www.avg.com">www.avg.com</a><br>
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_______________________________________________
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---

From: "Mike Garvey" <[email-masked]>
Date: Mon, 29 Feb 2016 12:49:07 -0500

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Some LEDs have built-in steering diodes (as in a full wave bridge =
rectifier) and will run on either polarity.  In theory, this should =
allow them to run on AC supplies as well.
Mike
=20
From: Healeys [mailto:[email-masked]] On Behalf Of =
Michael Oritt
Sent: Monday, February 29, 2016 12:14 PM
To: Austin Healey
Subject: [Healeys] LED polarity
=20
This really is not a car-related question though I guess we could make =
it into one:
=20
I have some 24VDC outdoor LED lighting and the wall-plug type =
transformer is defective.  I cannot determine which of the two fine =
wires that run to the appliance (LED's) is positive.  I can find a =
replacement transformer online.=20
=20
Here's the question:  I understand that LEDs are polarity-sensitive and =
if I wire them up backwards will I destroy the LEDs or can I simply =
reverse the polarity?
=20
Best--Michael Oritt

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'tab-interval:.5in'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>Some LEDs have built-in =
steering diodes (as in a full wave bridge rectifier) and will run on =
either polarity. <span style=3D'mso-spacerun:yes'>=C2=A0</span>In =
theory, this should allow them to run on AC supplies as =
well.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>Mike<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman"'>From:</span></b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman"'> Healeys =
[mailto:[email-masked]] <b>On Behalf Of </b>Michael =
Oritt<br><b>Sent:</b> Monday, February 29, 2016 12:14 PM<br><b>To:</b> =
Austin Healey<br><b>Subject:</b> [Healeys] LED =
polarity<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>This really is not a =
car-related question though I guess we could make it into =
one:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'color:#3333FF'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>I have some 24VDC =
outdoor LED lighting and the wall-plug type transformer is =
defective.&nbsp; I cannot determine which of the two fine wires that run =
to the appliance (LED's) is positive.&nbsp; I can find a replacement =
transformer online.&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'color:#3333FF'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>Here's the question: =
&nbsp;I understand that LEDs are polarity-sensitive and if I wire them =
up backwards will I destroy the LEDs or can I simply reverse the =
polarity?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'color:#3333FF'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#3333FF'>Best--Michael =
Oritt<o:p></o:p></span></p></div></div></div></body></html>
------=_NextPart_000_00DD_01D172EF.956C7BC0--

--===============6859114610398767030==
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[email-masked]

--===============6859114610398767030==--

---

From: Richard Ewald <[email-masked]>
Date: Mon, 29 Feb 2016 10:01:42 -0800

--===============5874895653756955834==

--001a1134dfb4fc2d4a052cec709e

The part that bothers me is the 24V.  That is way, more voltage than an LED
is supposed to run on.  There needs to be a dropping resistor in the
circuit or the LEDs will go up in smoke.
Rick

On Mon, Feb 29, 2016 at 9:49 AM, Mike Garvey <[email-masked]> wrote:

> Some LEDs have built-in steering diodes (as in a full wave bridge
> rectifier) and will run on either polarity.  In theory, this should allow
> them to run on AC supplies as well.
>
> Mike
>
>
>
> *From:* Healeys [mailto:[email-masked]] *On Behalf Of *Michael
> Oritt
> *Sent:* Monday, February 29, 2016 12:14 PM
> *To:* Austin Healey
> *Subject:* [Healeys] LED polarity
>
>
>
> This really is not a car-related question though I guess we could make it
> into one:
>
>
>
> I have some 24VDC outdoor LED lighting and the wall-plug type transformer
> is defective.  I cannot determine which of the two fine wires that run to
> the appliance (LED's) is positive.  I can find a replacement transformer
> online.
>
>
>
> Here's the question:  I understand that LEDs are polarity-sensitive and if
> I wire them up backwards will I destroy the LEDs or can I simply reverse
> the polarity?
>
>
>
> Best--Michael Oritt
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>
>

--001a1134dfb4fc2d4a052cec709e
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">The part that bothers me is the 24V.=C2=A0 That is way, mo=
re voltage than an LED is supposed to run on.=C2=A0 There needs to be a dro=
pping resistor in the circuit or the LEDs will go up in smoke.<div>Rick</di=
v></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, F=
eb 29, 2016 at 9:49 AM, Mike Garvey <span dir=3D"ltr">&lt;<a href=3D"mailto=
:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vl=
ink=3D"purple"><div><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">Some =
LEDs have built-in steering diodes (as in a full wave bridge rectifier) and=
 will run on either polarity. <span>=C2=A0</span>In theory, this should all=
ow them to run on AC supplies as well.<u></u><u></u></span></p><p class=3D"=
MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,=
&quot;sans-serif&quot;;color:#1f497d">Mike<u></u><u></u></span></p><p class=
=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;;color:#1f497d"><u></u>=C2=A0<u></u></span></p><d=
iv style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0i=
n 0in"><p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-famil=
y:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D=
"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> H=
ealeys [mailto:<a href=3D"mailto:[email-masked]" target=3D"=
_blank">[email-masked]</a>] <b>On Behalf Of </b>Michael Ori=
tt<br><b>Sent:</b> Monday, February 29, 2016 12:14 PM<br><b>To:</b> Austin =
Healey<br><b>Subject:</b> [Healeys] LED polarity<u></u><u></u></span></p></=
div><span class=3D""><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><d=
iv><p class=3D"MsoNormal"><span style=3D"color:#3333ff">This really is not =
a car-related question though I guess we could make it into one:<u></u><u><=
/u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"color:#3333f=
f"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span s=
tyle=3D"color:#3333ff">I have some 24VDC outdoor LED lighting and the wall-=
plug type transformer is defective.=C2=A0 I cannot determine which of the t=
wo fine wires that run to the appliance (LED&#39;s) is positive.=C2=A0 I ca=
n find a replacement transformer online.=C2=A0<u></u><u></u></span></p></di=
v><div><p class=3D"MsoNormal"><span style=3D"color:#3333ff"><u></u>=C2=A0<u=
></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"color:#333=
3ff">Here&#39;s the question: =C2=A0I understand that LEDs are polarity-sen=
sitive and if I wire them up backwards will I destroy the LEDs or can I sim=
ply reverse the polarity?<u></u><u></u></span></p></div><div><p class=3D"Ms=
oNormal"><span style=3D"color:#3333ff"><u></u>=C2=A0<u></u></span></p></div=
><div><p class=3D"MsoNormal"><span style=3D"color:#3333ff">Best--Michael Or=
itt<u></u><u></u></span></p></div></div></span></div></div><br>____________=
___________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive" rel=3D"noreferrer" target=
=3D"_blank">http://www.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums" rel=3D"noreferrer" target=3D=
"_blank">http://www.team.net/forums</a><br>
<br>
<a href=3D"mailto:[email-masked]">[email-masked]</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys" rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/options/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><br></div>

--001a1134dfb4fc2d4a052cec709e--

--===============5874895653756955834==
Content-Transfer-Encoding: 7bit
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[email-masked]

--===============5874895653756955834==--

---

From: Michael Oritt <[email-masked]>
Date: Mon, 29 Feb 2016 13:29:40 -0500

--===============3315698628482473427==

--089e013d1eba2937c0052cecd67f

Thanks all for the many responses and now that I know I will not blow the
LEDs should I wire things backwards I will find a replacement transformer
and proceed.  With no way of knowing which of the two wires that run to the
LED string my chances are 50-50 I will get it right, but if not I will
simply reverse leads.

Best--Michael Oritt

On Mon, Feb 29, 2016 at 1:01 PM, Richard Ewald <[email-masked]>
wrote:

> The part that bothers me is the 24V.  That is way, more voltage than an
> LED is supposed to run on.  There needs to be a dropping resistor in the
>> rectifier) and will run on either polarity.  In theory, this should
>> Here's the question:  I understand that LEDs are polarity-sensitive and
>> if I wire them up backwards will I destroy the LEDs or can I simply reverse
>> the polarity?
>>
>>
>>
>> Best--Michael Oritt
>>
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>
>

--089e013d1eba2937c0052cecd67f
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Thank=
s all for the many responses and now that I know I will not blow the LEDs s=
hould I wire things backwards I will find a replacement transformer and pro=
ceed.=C2=A0 With no way of knowing which of the two wires that run to the L=
ED string my chances are 50-50 I will get it right, but if not I will simpl=
y reverse leads.</div><div class=3D"gmail_default" style=3D"color:#3333ff">=
<br></div><div class=3D"gmail_default" style=3D"color:#3333ff">Best--Michae=
l Oritt=C2=A0</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail=
_quote">On Mon, Feb 29, 2016 at 1:01 PM, Richard Ewald <span dir=3D"ltr">&l=
t;<a href=3D"mailto:[email-masked]" target=3D"_blank">richard.ewal=
[email-masked]</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div di=
r=3D"ltr">The part that bothers me is the 24V.=C2=A0 That is way, more volt=
age than an LED is supposed to run on.=C2=A0 There needs to be a dropping r=
esistor in the circuit or the LEDs will go up in smoke.<div>Rick</div></div=
><div class=3D"gmail_extra"><br><div class=3D"gmail_quote"><div><div class=
=3D"h5">On Mon, Feb 29, 2016 at 9:49 AM, Mike Garvey <span dir=3D"ltr">&lt;=
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]<=
/a>&gt;</span> wrote:<br></div></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><d=
iv class=3D"h5"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div><p =
class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,&quot;sans-serif&quot;;color:#1f497d">Some LEDs have built-in stee=
ring diodes (as in a full wave bridge rectifier) and will run on either pol=
arity. <span>=C2=A0</span>In theory, this should allow them to run on AC su=
pplies as well.<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=
=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;=
;color:#1f497d">Mike<u></u><u></u></span></p><p class=3D"MsoNormal"><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&q=
uot;;color:#1f497d"><u></u>=C2=A0<u></u></span></p><div style=3D"border:non=
e;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class=3D"Mso=
Normal"><b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&=
quot;sans-serif&quot;">From:</span></b><span style=3D"font-size:10.0pt;font=
-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Healeys [mailto:<a href=
=3D"mailto:[email-masked]" target=3D"_blank">healeys-bounce=
[email-masked]</a>] <b>On Behalf Of </b>Michael Oritt<br><b>Sent:</b> Mon=
day, February 29, 2016 12:14 PM<br><b>To:</b> Austin Healey<br><b>Subject:<=
/b> [Healeys] LED polarity<u></u><u></u></span></p></div><span><p class=3D"=
MsoNormal"><u></u>=C2=A0<u></u></p><div><div><p class=3D"MsoNormal"><span s=
tyle=3D"color:#3333ff">This really is not a car-related question though I g=
uess we could make it into one:<u></u><u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"color:#3333ff"><u></u>=C2=A0<u></u></span></p=
></div><div><p class=3D"MsoNormal"><span style=3D"color:#3333ff">I have som=
e 24VDC outdoor LED lighting and the wall-plug type transformer is defectiv=
e.=C2=A0 I cannot determine which of the two fine wires that run to the app=
liance (LED&#39;s) is positive.=C2=A0 I can find a replacement transformer =
online.=C2=A0<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><sp=
an style=3D"color:#3333ff"><u></u>=C2=A0<u></u></span></p></div><div><p cla=
ss=3D"MsoNormal"><span style=3D"color:#3333ff">Here&#39;s the question: =C2=
=A0I understand that LEDs are polarity-sensitive and if I wire them up back=
wards will I destroy the LEDs or can I simply reverse the polarity?<u></u><=
u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"color:#33=
33ff"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><spa=
n style=3D"color:#3333ff">Best--Michael Oritt<u></u><u></u></span></p></div=
></div></span></div></div><br></div></div><span class=3D"">________________=
_______________________________<br>
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[email-masked]

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---

From: Oudesluys <[email-masked]>
Date: Mon, 29 Feb 2016 19:33:32 +0100

This is a multi-part message in MIME format.
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Right.
There is often an indicator on one of the two feed wires: black, white, 
red line on one of the wires, indicating this is the positive wire.
Kees Oudesluijs

Op 29-2-2016 om 19:29 schreef Michael Oritt:
> Thanks all for the many responses and now that I know I will not blow 
> the LEDs should I wire things backwards I will find a replacement 
> transformer and proceed. With no way of knowing which of the two wires 
> that run to the LED string my chances are 50-50 I will get it right, 
> but if not I will simply reverse leads.
>
> Best--Michael Oritt
>
> On Mon, Feb 29, 2016 at 1:01 PM, Richard Ewald 
>
>     The part that bothers me is the 24V.  That is way, more voltage
>     than an LED is supposed to run on. There needs to be a dropping
>     resistor in the circuit or the LEDs will go up in smoke.
>     Rick
>
>     On Mon, Feb 29, 2016 at 9:49 AM, Mike Garvey <[email-masked]
>
>         Some LEDs have built-in steering diodes (as in a full wave
>         bridge rectifier) and will run on either polarity. In theory,
>         this should allow them to run on AC supplies as well.
>
>         Mike
>
>         *From:*Healeys [mailto:[email-masked]
>         *Michael Oritt
>         This really is not a car-related question though I guess we
>         could make it into one:
>
>         transformer is defective.  I cannot determine which of the two
>         fine wires that run to the appliance (LED's) is positive. I
>         can find a replacement transformer online.
>
>         Here's the question:  I understand that LEDs are
>         polarity-sensitive and if I wire them up backwards will I
>         destroy the LEDs or can I simply reverse the polarity?
>
>         Best--Michael Oritt
>
>

--------------060101000504080704010705
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<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <div class="moz-cite-prefix">Right.<br>
      There is often an indicator on one of the two feed wires: black,
      white, red line on one of the wires, indicating this is the
      positive wire.<br>
      Kees Oudesluijs<br>
      <br>
      <br>
      <br>
      Op 29-2-2016 om 19:29 schreef Michael Oritt:<br>
    </div>
    <blockquote
cite="mid:[email-masked]"
      type="cite">
      <meta http-equiv="Context-Type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default">Thanks all for the many responses and
          now that I know I will not blow the LEDs should I wire things
          backwards I will find a replacement transformer and proceed. 
          With no way of knowing which of the two wires that run to the
          LED string my chances are 50-50 I will get it right, but if
          not I will simply reverse leads.</div>
        <div class="gmail_default"><br>
        </div>
        <div class="gmail_default">Best--Michael Oritt </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Mon, Feb 29, 2016 at 1:01 PM,
          Richard Ewald <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:[email-masked]" target="_blank">[email-masked]</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote">
            <div dir="ltr">The part that bothers me is the 24V.  That is
              way, more voltage than an LED is supposed to run on. 
              There needs to be a dropping resistor in the circuit or
              the LEDs will go up in smoke.
              <div>Rick</div>
            </div>
            <div class="gmail_extra"><br>
              <div class="gmail_quote">
                <div>
                  <div class="h5">On Mon, Feb 29, 2016 at 9:49 AM, Mike
                    Garvey <span dir="ltr">&lt;<a
                        moz-do-not-send="true"
                        href="mailto:[email-masked]" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a></a>&gt;</span>
                    wrote:<br>
                  </div>
                </div>
                <blockquote class="gmail_quote">
                  <div>
                    <div class="h5">
                      <div lang="EN-US">
                        <div>
                          <p class="MsoNormal"><span>Some LEDs have
                              built-in steering diodes (as in a full
                              wave bridge rectifier) and will run on
                              either polarity. <span> </span>In theory,
                              this should allow them to run on AC
                              supplies as well.</span></p>
                          <p class="MsoNormal"><span>Mike</span></p>
                          <p class="MsoNormal"><span> </span></p>
                          <div>
                            <p class="MsoNormal"><b><span>From:</span></b><span>
                                Healeys [mailto:<a
                                  moz-do-not-send="true"
                                  href="mailto:[email-masked]"
                                  target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a></a>]
                                <b>On Behalf Of </b>Michael Oritt<br>
                                <b>Sent:</b> Monday, February 29, 2016
                                12:14 PM<br>
                                <b>To:</b> Austin Healey<br>
                                <b>Subject:</b> [Healeys] LED polarity</span></p>
                          </div>
                          <span>
                            <p class="MsoNormal"> </p>
                            <div>
                              <div>
                                <p class="MsoNormal"><span>This really
                                    is not a car-related question though
                                    I guess we could make it into one:</span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span> </span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span>I have some
                                    24VDC outdoor LED lighting and the
                                    wall-plug type transformer is
                                    defective.  I cannot determine which
                                    of the two fine wires that run to
                                    the appliance (LED's) is positive. 
                                    I can find a replacement transformer
                                    online. </span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span> </span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span>Here's the
                                    question:  I understand that LEDs
                                    are polarity-sensitive and if I wire
                                    them up backwards will I destroy the
                                    LEDs or can I simply reverse the
                                    polarity?</span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span> </span></p>
                              </div>
                              <div>
                                <p class="MsoNormal"><span>Best--Michael
                                    Oritt</span></p>
                              </div>
                            </div>
                          </span></div>
                      </div>
                      <br>
                    </div>
                  </div>
                  <span class="">_______________________________________________<br>
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[email-masked]

--===============7097656358566069634==--

---

From: "Mike Garvey" <[email-masked]>
Date: Mon, 29 Feb 2016 17:00:25 -0500

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I will echo Rick's remark; the forward voltage drop across an LED is =
about 3.3 or 3.4 volts. Maybe there are several (7?) LEDs in series or =
maybe a resistor in series as Rick suggests.  If the replacement power =
supply is not an EXACT replacement, perhaps including the resistor, I'd =
proceed with great caution.
Mike=20
=20
From: Richard Ewald [mailto:[email-masked]]=20
Sent: Monday, February 29, 2016 1:02 PM
To: Mike Garvey
Cc: Austin Healey
Subject: Re: [Healeys] LED polarity
=20
The part that bothers me is the 24V.  That is way, more voltage than an =
LED is supposed to run on.  There needs to be a dropping resistor in the =
circuit or the LEDs will go up in smoke.
Rick
=20
On Mon, Feb 29, 2016 at 9:49 AM, Mike Garvey <[email-masked]> wrote:
Some LEDs have built-in steering diodes (as in a full wave bridge =
rectifier) and will run on either polarity.  In theory, this should =
allow them to run on AC supplies as well.
Mike
=20
From: Healeys [mailto:[email-masked]] On Behalf Of =
Michael Oritt
Sent: Monday, February 29, 2016 12:14 PM
To: Austin Healey
Subject: [Healeys] LED polarity
=20
This really is not a car-related question though I guess we could make =
it into one:
=20
I have some 24VDC outdoor LED lighting and the wall-plug type =
transformer is defective.  I cannot determine which of the two fine =
wires that run to the appliance (LED's) is positive.  I can find a =
replacement transformer online.=20
=20
Here's the question:  I understand that LEDs are polarity-sensitive and =
if I wire them up backwards will I destroy the LEDs or can I simply =
reverse the polarity?
=20
Best--Michael Oritt

[email-masked]

=20

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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'tab-interval:.5in'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>I will echo Rick's remark; the =
forward voltage drop across an LED is about 3.3 or 3.4 volts. Maybe =
there are several (7?) LEDs in series or maybe a resistor in series as =
Rick suggests.<span style=3D'mso-spacerun:yes'>=C2=A0 </span>If the =
replacement power supply is not an EXACT replacement, perhaps including =
the resistor, I'd proceed with great caution.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>Mike <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman"'>From:</span></b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman"'> Richard Ewald =
[mailto:[email-masked]] <br><b>Sent:</b> Monday, February 29, =
2016 1:02 PM<br><b>To:</b> Mike Garvey<br><b>Cc:</b> Austin =
Healey<br><b>Subject:</b> Re: [Healeys] LED =
polarity<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>The =
part that bothers me is the 24V.&nbsp; That is way, more voltage than an =
LED is supposed to run on.&nbsp; There needs to be a dropping resistor =
in the circuit or the LEDs will go up in smoke.<o:p></o:p></p><div><p =
class=3DMsoNormal>Rick<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>On Mon, =
Feb 29, 2016 at 9:49 AM, Mike Garvey &lt;<a =
href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Some LEDs have built-in steering diodes (as in a full wave bridge =
rectifier) and will run on either polarity. &nbsp;In theory, this should =
allow them to run on AC supplies as well.</span><o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Mike</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><o:p></o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-outline-l=
evel:1'><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Healeys [mailto:<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>] <b>On Behalf Of =
</b>Michael Oritt<br><b>Sent:</b> Monday, February 29, 2016 12:14 =
PM<br><b>To:</b> Austin Healey<br><b>Subject:</b> [Healeys] LED =
polarity</span><o:p></o:p></p></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p><=
/o:p></p><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>This really is not a car-related question though =
I guess we could make it into one:</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>I have some 24VDC outdoor LED lighting and the =
wall-plug type transformer is defective.&nbsp; I cannot determine which =
of the two fine wires that run to the appliance (LED's) is =
positive.&nbsp; I can find a replacement transformer =
online.&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>Here's the question: &nbsp;I understand that =
LEDs are polarity-sensitive and if I wire them up backwards will I =
destroy the LEDs or can I simply reverse the =
polarity?</span><o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'color:#3333FF'>Best--Michael =
Oritt</span><o:p></o:p></p></div></div></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><br>______________________________________=
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