[arm-allstar] RPi2 Accidental crashes

[Stanley Stanukinos]

Wow, learned something new. 

Stan

Sent from my iPhone

> On Feb 27, 2016, at 11:49 AM, David McGough via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> 
> Hi Stan,
> 
> The issue is literally the photoelectric effect causing the problem (not
> EMP).  So, the chip needs better shielding from light. This phenomenon can
> happen with -all- integrated circuits, transistors, diodes, etc. However,
> most have a thick layer of opaque plastic (or ceramic or metal)
> encapsulating them, which stops the light from reaching the actual
> sensitive semiconductor materials.
> 
> Unfortunately, that plastic layer also makes the chip considerably bigger.  
> So, in this case, the chip manufacturer left the plastic off, to reduce
> size. The big negative side effect is that bright light makes it act
> like a little solar cell, totally confusing it and making it loose voltage
> regulation. The only good thing is that, when this happens, the output
> voltage seems to drop (at least based on the article I saw!)--so,
> hopefully not causing any permanent circuit damage.
> 
> 73, David KB4FXC
> 
> 
>> On Sat, 27 Feb 2016, Stanley Stanukinos via arm-allstar wrote:
>> 
>> Interesting issue, I would have thought it was the energy pulse but 
> when I read the article further it could even be induced by using a 
> laser. Sounds like the chip mfg needs to do a little work in emp 
> reduction.  
>> 
>> Stan
>> 
>> Sent from my iPhone
>> 
> 
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