12 Jul
2005
12 Jul
'05
7:36 p.m.
yeah, it's AC alright. 20hz at 72volts is nothing to screw around with.
It's like riding a slow wave... it don't necessarily kill you... but it
sure does suck.
You know why it was 20hz / 72volts? Because it has to do with the way
that the original bells inside of the circuitry on a phone would react so
perfectly to that. I love em' old phones.
-----Original Message-----
From: "Curt @ Atari Museum" <curt at atarimuseum.com>
To: General at smtp5.suscom.net, "Discussion at smtp5.suscom.net":On-Topic and
Off-Topic Posts <cctalk at classiccmp.org>
Cc:
Date: Tue, 12 Jul 2005 15:23:35 -0400
Subject: Re: Somewhat OT Knob & Tube wiring (was Re: Power and the RA82)
Still burns and leaves the God-awefullest metal taste
in your mouth
when
you get hit with a ring surge, You sure its AC? Doesn't make
sense,
but voltage on my meter would jump up from 48-52vdc to around 78-80vdc
on the DVM
Curt
Paul Koning wrote:
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>>>>"curt" == curt <@ Atari Museum" <curt at
atarimuseum.com>> writes:
>>>>
>>>>
curt> AC "zaps" for a 10th of second at 110v isn't too bad when
curt> crawling around running wires, it smarts and leave a nasty
curt> tingling feeling in your teeth, makes you super wary the rest
curt> of the day.
curt> What is the most painful is hooking up a telco line (I used to
curt> work for an alarm company many many moons ago) and it just
curt> never failed that when you were wiring up the RJ31X fail-over
curt> box to the alarm system, somebody would call into the line and
curt> man does DC hurt and burn ...
Ring isn't DC. The steady state voltage on a phoneline is -48V DC
(give or take quite a lot; I think the spec says the max is -60).
Ring voltage is 10 Hz AC, around 100 volts.
paul