[sdiy] Speaking of LEDs...

[John L Marshall]

Harry,

You are Riley funny.


Take care,
John
www.sound-photo.com
---------------------------------------------------------------------------

----- Original Message -----
From: "harrybissell" <harrybissell at prodigy.net>
To: "John L Marshall" <john.l.marshall at gte.net>
Cc: "patchell" <patchell at silcom.com>; "Peter Grenader"
<petergrenader at mksound.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, February 06, 2003 9:07 PM
Subject: Re: [sdiy] Speaking of LEDs...


> Use one of those new RGB leds and make it morph through a rainbow...
> in curved air (perhaps) ?
>
> H^) harry
>
> John L Marshall wrote:
>
> > And, if the voltage is wagging (going positive then negative fast
enough)
> > get colors between the two.
> >
> > Take care,
> > John
> > www.sound-photo.com
>
> --------------------------------------------------------------------------
-
> >
> > ----- Original Message -----
> > From: "patchell" <patchell at silcom.com>
> > To: "Peter Grenader" <petergrenader at mksound.com>
> > Cc: <synth-diy at dropmix.xs4all.nl>
> > Sent: Thursday, February 06, 2003 7:41 PM
> > Subject: Re: [sdiy] Speaking of LEDs...
> >
> > >     There is no problem, the diode will always be forward biased, you
just
> > need
> > > to make sure you don't exceed the maximum current.
> > >
> > >     But, here is a sugestion...if the voltage can go both positive and
> > negative
> > > about ground, use a two lead-bi color LED and tie it to ground instead
> > of -12.
> > > That way, when the voltage is positive, you will get one color, when
> > negative,
> > > another...
> > >
> > > Peter Grenader wrote:
> > >
> > > > Question for the masters:
> > > >
> > > > How lame is it that I am driving an LED with 20 volts across it and
a 2k
> > > > current limit?
> > > >
> > > > We thinks that before too long, it will be blown to smitherens and
> > become a
> > > > zener. I was thinking of putting a few 1N4148's in there in series
with
> > it
> > > > to lessen its load.
> > > >
> > > > What I want to do is a cheap and dirty way to show the level of a
smooth
> > > > random voltage, which will fluctuate between these two rails (about
+8
> > volts
> > > > to -12).  I am currently driving this with a unity gain op amp.
> > > >
> > > > to see the specific application, go here:
> > > >
> > > > http://www.buzzclick-music.com/sample_hold.jpg
> > > >
> > > > Any suggestions?  OK the way it is?
> > > >
> > > > thanks in advance,
> > > >
> > > > Peter
> > >
> > > --
> > >  -Jim
> > > ------------------------------------------------
> > > * Visit:http://www.silcom.com/~patchell/
> > > *-----------------------------------------------
> > > *I'm sure glad Merry Christmas comes just once a year
> > > * -Yogi Yorgensen
> > > ------------------------------------------------
> > >
> > >
>