Re: Q: for you 12V electrical wizzards.


Joe Rooney wrote:
"Ken Shackleton" <ken.shackleton@xxxxxxx> wrote in message
news:1139355103.823590.47900@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

john wrote:
"XR650L_Dave" <is skeptical of the building better idiots every day
schools>
"Right....I was thinking of the effect on the LED, not the control
circuitry per se. I also assumed that the signal light [designed for
12VDC] would be simply LED's and current-limiting resistors. Cheap to
produce, simple, robust... "

I've long since stopped thinking "there's no way they'd build this
thing so it would break THAT easily!".

-DDave

reverse current goes to heat, i know my gas gas coil
does 100 watts + guessing led's that run on milli
amps wouldn't like to have all that juice running wild.
http://www.theledlight.com/pdf/NSPW500CS_18000mcd.pdf
5 volts @ 50 uA

I just read that link....the Vreverse is only 5 volts?? That is
exceptionally low. Ordinary diodes are typically in the hundreds of
volts for PIV. This would be the point at which the LED starts to
conduct in a reverse direction. This is much lower than I would have
guessed it to be.

Ken,

There are signs on the horizon that a silicon based LED may reach
manufacturing yields, but for now LEDs are made from III IV elements
gallium, aresenic, phosphor, and a bunch of other elements are used to form
the junction. The diode is forward biased and when electrons move to a
lower energy band, they emit a photon of light.

The reverse voltage stinks and they also suffer from current crowding in the
forward direction.

Interesting....Slocal...better talk to the manufacturer and see what
the Vreverse or PIV [Peak Inverse Voltage] is for your device.
Also...you might want to verify if your bike's voltage output is
regulated DC or AC.

I do have a nasty habit of sometimes typing before I am in possession
of all the pertinent facts....I apologize if I caused any confusion.

Ken


I learned all this from my neighbor. I wish my neighbor was a stunning
Swedish bombshell, but no..., he's one of those dingbat Noweigians.

Joe

XL600R

.

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  • Re: Q: for you 12V electrical wizzards.
    ... I also assumed that the signal light [designed for ... I just read that link....the Vreverse is only 5 volts?? ... conduct in a reverse direction. ... but for now LEDs are made from III IV elements ...
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