;)
-- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 18 i686) Linux 3.9.6-200.fc18.i686 ^ ^ 21:15:01 up 1 day 1:36 0 users load average: 0.00 0.01 0.05 ???! ???! ???! ???! ???! ???! ????? (CSSA):
--- I'm intrigued...
It seems like with the choice of your "toylet" addy there's something anal driving you, and with your essentially anonymous account at gmail, you want to snipe.
Why?
-- JF
I just want to know whether it could be done. Everyone said it's safer to assume that LED would short itself.
Now, how could we prove that LED would really do it using experiments?
-- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 19 i686) Linux 3.9.8-300.fc19.i686 ^ ^ 15:45:01 up 9 min 0 users load average: 0.30 0.24 0.16 ???! ???! ???! ???! ???! ???! ????? (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
Yes, put an amp meter in line with the LED and start raising the voltage across. You'll see the amperage raise rapidly as you approach the voltage drop of the diode, indicating it acts like a short until it burns out.
Another way to do this is to put a resistor and LED in series with a variable voltage source. Measure the voltage across the Resistor as you increase the voltage of the source. After you reach the rated voltage of the LED, you'll see the rest of the going across the resistor, no matter how much more voltage you add (until you burn them both out, of course).
I did that once, 100mA at 5V about 1 hour on a fairly ordinary red LED, then it failed open. which if the semiconductor junctions is responsible for 2V of the drop a inticates about 33 ohms ohmic resistance.
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If there is a need for a diode to fail in short circuit, there ARE some surge-protection diodes that do that (Zener types). As for LEDs, the failure modes can include low light output or fused (open circuit) bond wires. Or, presumably, short circuit.
But, I'm not aware of any LED types that can be expected to become short circuits under any reasonable conditions. If you really WANT the LED to be replaced with a short, use a relay.
Just wanna prove that LED could short itself under the right conditions.... :)
-- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 19 i686) Linux 3.9.9-301.fc19.i686 ^ ^ 20:03:01 up 1 day 1:54 1 user load average: 0.16 0.10 0.07 ???! ???! ???! ???! ???! ???! ????? (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
Did you read my earlier reply? It answers exactly why it should be
*treated* as a short, even if it doesn't fail as a short.
That's why I am interested in devising an experiment to make it happen... :)
What all of you said is: do NOT treat a diode as a resistor or a fuse.
-- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 19 i686) Linux 3.9.9-301.fc19.i686 ^ ^ 21:21:01 up 25 min 0 users load average: 0.00 0.01 0.05 ???! ???! ???! ???! ???! ???! ????? (CSSA):
And I devised such an experiment. Did you try it? What did you observe?
Not yet... busy with something else. Relevant messages copied. :)
-- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 19 i686) Linux 3.9.9-301.fc19.i686 ^ ^ 20:45:01 up 19 min 0 users load average: 0.00 0.03 0.08 ???! ???! ???! ???! ???! ???! ????? (CSSA):
In other words, you've run out of steam to troll on the topic?
You've been obsessed with this since it was first mentioned, and once someone gives you a 30 minute experiment to try, suddenly you've got no time?
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