Re: [NSVC] LED Experts - need help..

Or maybe you could have it compare mp3 collections and swap songs it
thinks the listener would enjoy...

On 2/22/06, Ferenc Kovac <[email protected]> wrote:
> interesting that the mode of failure is a short - the more of those you short out in a string, the more you're likeley to overdrive the remaining ones ...
>
>   i, too, would have suspected some sequencing or strobing, but then, that would be an interesting/useful product - like increase the on duty cycle or having them flash on/off when the brake's depressed, moving arrows in the direction of the turn signal, smiley face when scraping pegs or perhaps some text, graphics, or other facial or hand gestures, as needed.  you could also exchange info with other riders like a serial IR) with your contact info.  this, all of course, on a relatively uneventful ride, and as automated as possible.
>
>   perhaps i should start a cottage industry - or is someone else already doing this?
>
>   ferenc
>
> Chris Weiss <[email protected]> wrote:
>   Yeah, I was thinking maybe there was some circuitry involved (like
> maybe they did some kind of sequencing or other bling bling), but I
> got a chance to look at the back of the boards, they're pretty
> straightforward, just a run of LEDs wired in series.
>
> Thanks mucho for the help!
>
> On 2/22/06, Jim Stewart wrote:
> > Chris Weiss wrote:
> >
> > > The crazy thing is the advice from the mfg when he emailed support:
> > > 1. The LEDs may take a while to light up due to static charge from the
> > > plastic wrap
> > > 2. For better results, charge LEDs with 36 volts battery for 15
> > > seconds prior to installation
> > >
> >
> > Total horsepuckey. LEDs are diodes - they light when forward current is applied
> > to them. They are not high-impedance devices which can be affected by a static
> > charge. They can't be charged like a capacitor, either. If these LEDs are
> > intended for 12-14 volt applications, the 36 volt jolt will force almost three
> > times the design current through them. Good way to destroy a diode.
> >
> > I have some advice to your friend: send the damn things back and don't deal
> > with these people again.
> >
> > BTW, who is selling these things? Just as a warning...
> >
> > -js
> >
> >
> > --
> > Jim Stewart
> > http://www.strappe.com
> >
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