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Re: [Healeys] LED polarity

To: healeys@autox.team.net
Subject: Re: [Healeys] LED polarity
From: Oudesluys <coudesluijs@chello.nl>
Date: Mon, 29 Feb 2016 19:33:32 +0100
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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 <r3m1g4@verizon.net
>
>         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:healeys-bounces@autox.team.net
>         *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
>
>
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    <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:CAPTa0B5m_GY2cJyudCsDeEgZBvh-+Bj-j_Kyoqe5iMq3WeLuQg@mail.gmail.com"
      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:richard.ewald@gmail.com"; 
target="_blank">richard.ewald@gmail.com</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:r3m1g4@verizon.net"; target="_blank"><a 
class="moz-txt-link-abbreviated" 
href="mailto:r3m1g4@verizon.net";>r3m1g4@verizon.net</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:healeys-bounces@autox.team.net";
                                  target="_blank"><a 
class="moz-txt-link-abbreviated" 
href="mailto:healeys-bounces@autox.team.net";>healeys-bounces@autox.team.net</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>
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