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In Reply to: RE: Odd means of lighting an LED in YBA Integre DT. posted by h_h on January 25, 2011 at 13:27:15
Two words: French Engineering
Those boys do it differently
Follow Ups:
They sure do, but I do like the way they sound (or don't sound, however you want to articulate it.)
The answer is:
The LED lights due to the stray capacitance in the switch that transfers enough of the 60 Hz 120 VAC to the LED's wires to light it. If they didn't short the LED when the switch was off, it would be on all the time. The high voltage readings are still a bit of a mystery to me, but the high input impedance of the DVM can lead to strange behaviour, and "ghost voltage readings" that would disappear if any substantial load were present. It would be interesting to view it on a scope, but I didn't bother.
Hello h h,
There is nothing magical about the way the power LED lights in a YBA Integre. If you have a closer look, you will see that there is a 100k resistor hidden between the body of the power switch and the front. It should be in a black tubing making it harder to see. This resistor is soldered to both sides of the switch.
Regards,
Is there no blocking diode somewhere with a better PIV than a LED to deal with the reverse swing? I wouldn't expect a LED to survive 120V reverse voltage.
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