[VoIP] Oslo phone

[Russ Price]

Steph Kerman wrote:
> Only electrolytic capacitors are subject to reforming.  They do so in 
> the presence of voltage, not the absence from it.

It could well be a bipolar electrolytic, and in any case the -48V gets 
applied to the cap when the phone is on-hook, with the cap passing the 
AC ring voltage if present.

>> The cap definitely says 0.5uF on it, and also has a 500V rating.
> Interesting!  That's an unexpectedly high rating.  Does it look 
> original?  What does Ralph Meyer say about ringing capacitor voltage 
> ratings?

*whoosh*  Who's Ralph Meyer?

Closeup of cap: <http://cnet.fubegra.net/photos/eb-cap.jpg>
The phone's innards: <http://cnet.fubegra.net/photos/eb-guts.jpg>
Outside view, with the K1000 accompanying it: 
<http://cnet.fubegra.net/eb-k1000.jpg>
Closeup of dial: <http://cnet.fubegra.net/photos/eb-dial.jpg>

>> Anyway, I was able to let it ring 20 times and not have it trip - 
>> maybe I won't need to do any surgery on it.
> It's been my experience that problems that go away mysteriously return 
> mysteriously too.

Just like "Heisenbugs" in computer programs!