[TriEmbed] RaspPi Power Protection

[Adam Haile]

Oh cool... I was hoping it was possible to just cut the voltage above a
certain level.
Thanks! I'll look further into that.

On Fri, Jan 15, 2016 at 2:00 PM, Rodney Radford <ncgadgetry at gmail.com>
wrote:

> I couldn't find the MAX486C used in that schematic, but I did find other
> chips in the MAX486 family made by Maxim.  The first few paragraphs explain
> how the chip works, and what the P and N channel MOSFETs do (one is for
> overvoltage to turn off the supply to the load, and other is for negative
> voltages to turn off the incoming supply completely).
>
> A nice find and will work great for your need.
>
> On Fri, Jan 15, 2016 at 1:42 PM, Adam Haile via TriEmbed <
> triembed at triembed.org> wrote:
>
>> Ahh, yeah. That little protection circuit (bottom left corner I assume)
>> quickly gets WAY over my head. I see what chips are there but have no idea
>> what that actually *does.* This is why I left CompE for SoftE... analog
>> circuits fry my brain :P Will have to research those chips some more and
>> see if my brain doesn't melt :P Thanks for the link... at least now I see
>> how it could/should be done. And in a VERY similar application.
>>
>> On Fri, Jan 15, 2016 at 1:31 PM, Alex Davis via TriEmbed <
>> triembed at triembed.org> wrote:
>>
>>> Check out how they did it on the Adafruit Pi Matrix Hat:
>>>
>>> https://learn.adafruit.com/system/assets/assets/000/022/441/original/leds_schem.png?1421437847
>>>
>>> It's all 5v, but the power input protection would be of interest.
>>>
>>> In my application, I run a 62x32 matrix off the same power supply as the
>>> Pi2, and to keep things happy required significant bypass caps across
>>> the power input to the matrix.
>>>
>>> > I'm playing with an idea for a Pi Zero "Hat" that would involve
>>> LEDs... I
>>> > know, shocking.
>>> >
>>> > So, I figured it would be possible to power the Pi off the LED power
>>> > input
>>> > but I want to support 12V LEDs as well. My current plan is just a
>>> jumper
>>> > (solderable probably) and a stern warning that it's your own fault if
>>> you
>>> > fry your Pi.
>>>
>>>
>>>
>>> --
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>>>
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>>
>>
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