Re: more X-rays Silvertel PoE Supply

"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:
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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>:
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https://www.dropbox.com/scl/fo/s6wfz2xtdyd6tv32tq3fp/AET6J4oF84HG2hJMeST6F-E?rlkey=acyvuv4z0h2kg0x97azbed8uo&dl=0

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Cannot make out much from those x-rays, pictures are better...
you can probably see the traces just like that?

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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.
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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.
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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

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(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/  )