[time-nuts] HP Stories: Battery Chargers, and a fading idolization of HP

[Adrian Godwin]

The schematics are so good - easy to read, lots of context. Even some
off-board parts shown so you can see where the signal ends up. Notes about
the function and adjustment. You can learn a lot from them. Manuals were
worth having.

So many of today's schematics are little more than a netlist : a bunch of
fragmented sections with no way to find how they link up (maybe net names
but you can't tell if they have 2 ends or several). Useless even for
troubleshooting, let alone education.


On Sat, Feb 9, 2019 at 6:08 PM Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:

> Hugh,
>
> I notice your design, like all other HP designs I have seen from
> that era, operates with a very high margin for low mains voltage.
>
> Do you happen to remember what HP's design criteria were for this ?
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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