[Diy_efi] DIY-WB construction & testing... help

[Shannen Durphey]

LOL!!!

I was very careful to install everything correctly.  When the LED wouldn't
work, and the tests were all passing, I referred to a prior post from Bruce
R which said "If all tests are good, and the LED doesn't light, the LED is
probably reversed."  I chalked it up to a late night mistake and just
swapped the leads.  If the el cheapo DVOM had been able to test LED
polarity, it wouldn't have ever happened.

<g>
Shannen

"Gregory A. Parmer" wrote:
> 
> Absodamnlutely. I wrote that and it's been reviewed, even. Ouch.
> I'll gladly make the update as soon as I can figure out exactly
> how to reword it. Thank goodness there's only a single LED.
> 
> -greg   the #1 Dummy
> 
> > Who's website is that anyhow?  Perhaps an update is in order...
> >
> > Thanks for the info guys,
> >   Andrew
> >
> >
> > on 7/19/02 10:41 AM, Scott Campbell at oneslowalltrac at yahoo.com wrote:
> >
> > > Oops I spoke too soon.
> > >
> > > The length of the lead, and the position of the flat
> > > spot varies between LED manufacturers.  However the
> > > Cathode can be identified by holding the LED up to the
> > > light.  The larger of terminal inside is the Cathode.
> > >
> > > Scott.
> > >
> > > --- Scott Campbell <oneslowalltrac at yahoo.com> wrote:
> > >> Hi Andrew,
> > >>
> > >> As you now know, that description of Anode/Cathode
> > >> identification is backward.
> > >>
> > >> On an LED, the Anode(+) is identified by the longer
> > >> lead and/or a flat on the side of the LED.  The
> > >> Cathode(-) is the shorter lead.
> > >>
> > >> (pin 2) Cathode ----|<|---- Anode (pin 1)
> > >>
> > >> Scott.
> > >>
> > >> --- Andrew Brownsword <asword at telus.net> wrote:
> > >>>>> on 7/18/02 2:27 PM, rr at RRauscher at nni.com
> > >> wrote:
> > >>> I reversed it and now it works fine.  I had it
> > >>> backward because this page
> > >>>
> > >> http://www.aces.edu/~gparmer/efi/temp/wb/guide.html
> > >>> says:
> > >>>
> > >>> "The cathode (+) is identified by end having the
> > >>> stripe , a "+" marking, or
> > >>> a longer lead. Also notable is that the LED has a
> > >>> flat spot machined on side
> > >>> of the lens corresponding to the anode (-). On the
> > >>> schematic, the cathode is
> > >>> the base of the triangle and the anode is the
> > >>> straight bar with the triangle
> > >>> pointing at it. Notice that the cathode (+) being
> > >>> identified by a stripe is
> > >>> a theme repeated on the circuit board (even for
> > >>> diodes like the LED which
> > >>> are not identified this way). If the leads have
> > >>> already been cut on your
> > >>> LED, look inside the diode. You'll notice two
> > >> hunks
> > >>> of metal. The larger is
> > >>> the anode."
> >
> >
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> >
> 
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