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

[Andrew Brownsword]

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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