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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: more X-rays  Silvertel PoE Supply
Date: Wed, 2 Oct 2024 11:46:21 -0400
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"john larkin" <JL@gct.com> wrote in message news:v6mqfjd93ib6q8j7d7ontsaouidieh5b2u@4ax.com...
> On Wed, 02 Oct 2024 06:22:43 GMT, Jan Panteltje <alien@comet.invalid>
> wrote:
>
>>On a sunny day (Tue, 01 Oct 2024 14:16:09 -0700) it happened john larkin
>><jl@glen--canyon.com> wrote in <tipofjdtie76lbtd7lc2ger5uo7sglq3p5@4ax.com>:
>>
>>>
>>>https://www.dropbox.com/scl/fo/s6wfz2xtdyd6tv32tq3fp/AET6J4oF84HG2hJMeST6F-E?rlkey=acyvuv4z0h2kg0x97azbed8uo&dl=0
>>
>>Cannot make out much from those x-rays, pictures are better...
>>you can probably see the traces just like that?
>
> The x-rays are fun, but are admittedly more useful for an opaque
> potted module or an IC or discrete semi. I can prety well trace the
> Silvertel without them.
>
> I have a gigantic scary Carribean guy who does the xrays and I wanted
> an excuse for taking him to lunch, which turned into an interesting
> hike around The Bernal Cut. He trashed the xray system software, and
> had to rebuild it, and now it can do movies, which is great.
>
> I'd like to have some products that can be powered by PoE or a wart,
> and may want to put two 24-volt PoE supplies in series to get 48, so I
> need to understand how they work. The xrays just help a bit.

If Ag9900 just works then why would you care how?

I did PoE with LTC4267 some years ago such that 12V could also be supplied from a wart.
Fully isolated with a PA1138 transformer.

These days I'd look at MP8017


>
> (When burials were outlawed in San Francisco, a railroad was
> constructed to Colma for all the dead bodies and headstones. That
> forced the Bernal Cut to be dug with people and mules. Colma now has
> more dead people than live ones. Some parts of San Francisco are paved
> with old headstones that nobody wanted to pay to ship.
> https://www.bernalcut.org/  )
>