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

[Scott Campbell]

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."
> > 
> > Which, as I read it anyhow, implies that the flat
> > spot is anode and the
> > stripe is cathode... meaning that the flat spot is
> > away from the stripe.
> > What am I missing?
> 
> =====
> "Never attribute to malice that which can be
> adequately explained by stupidity." -- Hanlon's
> Razor
> 
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=====
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