[hpsdr] LED polarity (was: OZY Startup Info)

[Philip Covington]

On 7/17/06, Scott Cowling <scotty at tonks.com> wrote:
> Hi Phil & Lyle,
>
> We ran into the same problem on boards that we design here at work.  Even
> LEDs from the same manufacturer and from the same series have different
> pins (A or K) marked. If you have a good microscope (or very good eyes) you
> can see that the die is mounted opposite in the two versions.
>
> We have standardized on marking LED anodes with a "+" sign. It is easy to
> read and does not imply any correspondence with the marked end.
>
> This does not work for Zener diodes, however. :-) On those, we mark the
> cathode with a "K".
>
> This method has really cut down on the incidence of "dead LED" syndrome on
> our prototypes. When we just used a dot or thick bar, we had about a 50%
> chance of getting the parts put on properly. :-)
>
> 73,
> Scotty WA2DFI

Hi Scotty,

I like your suggestion of using the "+" mark.  I was going to do this
initially but put an "a" at the last minute.

73 de Phil N8VB

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