> Peter L. Peres wrote:
>>
>> > LED traffic lights
>>
>> Of course everyone realises that in the event of a major surge or EMP
>> all the traffic lights will die. With or without switchers. (LEDs
>> don't like reverse biasing).
>
>> Interesting! Would you suggest a reverse diode across the LED array?
> Or better still a big zener or specialty surge diode, this would
> protect for both forward and backward surges, considering there should
> be a fair series resistance anyway? -Roman

I have no idea. Many LEDs in parallel have a lot of capacitance but they
are usually wired in series-parallel groups in a lamp. Perhaps a polyfuse
in series would save them from something coming from the wire, along with
a reverse protection diode or a special diode.

Peter

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