Dear Editors:
I meant to send a letter to the editor about the above article, but I must have clicked the wrong button. At any rate, this article was a real Rosetta Stone for me, because the author indicated the values for the current-limiting resistors to put in series with the LEDs. without this little bit of info, the happless hobbyist will spend hours blowing LEDs before giving up in despair.
Again, thanks for such an outstanding article. Because of it, I can now attempt some projects I've been wanting to attempt for some time.
Brian Willard
(grad student in astrophysics)