Is 200 amperes @ 2v not lethal? -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070
-2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed <paulsw...@gmail.com> wrote: > Just trying to figure out why a 2V power supply pretty curious. > Regards > Paul. > > > On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer <ed_pal...@sasktel.net> wrote: > > > I think there's lots of ECL in this thing. In 2012, Richard H > > McCorkle said that US Patent #6226231 was for part of the DTS-2075. > > It shows lots of ECL. My unit dates from around 2000 and doesn't > > have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V > > supplies might be adjusted for 5V2 and wired for negative voltage. I > > didn't check that. > > > > Ed > > > > > > On 9/9/2013 1:16 PM, paul swed wrote: > > > >> 2.1 volt hmm maybe they are doing something with ECL. Say the > >> common > logic > >> was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. > >> Though these look new enough that ECL should not be in the mix. > >> Regards > >> Paul > >> WB8TSL > >> > >> > >> On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer <ed_pal...@sasktel.net> > wrote: > >> > >> Hi Marki, > >>> > >>> > >>> On 9/9/2013 12:15 PM, Mark C. Stephens wrote: > >>> > >>> Amazing Ed, I just had a invasive discography last Thursday! > >>>> I have been a bit quiet because of a back injury too. > >>>> > >>>> You're creeping me out Marki! > >>> > >>> > >>> We must be living parallel lives, fortunately my telly is still > >>> good, my > >>> > >>>> 9 year old son has discovered Dr. Who so we are having great time > >>>> watching it :) Some of the original series are a hoot :) so > >>>> overdone but the Dalek's back then couldn't fly... > >>>> > >>>> I remember watching it when it was new in the early '60's. Scary. > >>> > >>> > >>> Only 1000 for a crown, It would be cheaper for me to fly to > >>> Canada to get > >>> > >>>> crown > >>>> My last crown was disaster as a result the clown that put the > >>>> crown in stuffed up and the crown snapped off at the root So > >>>> added to the $2400 for the crown, I am now up for around 7K for > >>>> an implant. > >>>> > >>>> Geez, I hope I don't follow in your footsteps! Your 'parallel lives' > >>> comment now has me really worried. > >>> > >>> > >>> The standby PSU tranny is dead short, zero ohm as compared to > >>> the > 2v/6A > >>> > >>>> supplies 8-10 ohm. > >>>> Any idea what that 2V supply is for?, > >>>> > >>>> Sorry, no clue. But my mainboard has a +2.1 volt test point so > there's > >>> certainly a 'family resemblance' between our units. Mine must > >>> generate the > >>> +2.1 volts on the mainboard. > >>> > >>> > >>> If I can lose the 2 linear PSU, I'll lose a ton of weight, but > possibly > >>> > >>>> at the expense of electrical noise. > >>>> I was thinking that is why they used optics between the control > >>>> board > - > >>>> to keep spurious noise to a minimum. > >>>> > >>>> Yes, but I would have thought that optoisolators would have been > >>> cheaper > >>> than optical transmitters, receivers, and cables. > >>> > >>> > >>> Yeah, I did play roulette by powering it up like that but I was > >>> a tad > >>> > >>>> annoyed as I was told it was a working unit. > >>>> The bottom board on this one has millions of tiny surface mount > >>>> caps mounted on there sides. > >>>> It looks terribly fragile. Much of a job to get it out? > >>>> > >>>> Well, I described my process in the teardown. Is your board similar? > >>> Other than the front panel stuff, board removal is just a matter > >>> of unplugging connectors and unscrewing the mounting screws. > >>> > >>> > >>> All the PSU screw heads are under it (of course) Yup. I needed > >>> to get at the mounting screws for the cardcage so that I could > >>> inspect the motherboard. > >>> > >>> Ed > >>> > >>> > >>> -----Original Message----- > >>> > >>>> From: time-nuts-boun...@febo.com [mailto:time-nuts-bounces@**fe** > bo.com<http://febo.com> > >>>> <time-nuts-bounces@febo.**com <time-nuts-boun...@febo.com>>] > >>>> > >>>> On Behalf Of Ed Palmer > >>>> Sent: Tuesday, 10 September 2013 1:53 AM > >>>> To: Discussion of precise time and frequency measurement > >>>> Subject: Re: [time-nuts] Wavecrest DTS 2070 > >>>> > >>>> Sorry, the oracle is out of the office today - I'm the janitor. > >>>> :) > >>>> > >>>> I see you've already replaced the 24V supply and powered the unit up. > I > >>>> would have removed all output connections on the supplies and > >>>> tested them seperately. Are you sure about that transformer > >>>> short? Remember that primaries on decent size line transformers > >>>> only have something ike > >>>> 2 to 4 ohms resistance at most. I wondered why yours was 12 lbs > >>>> heavier than mine. Linear supplies - that would do it! > >>>> > >>>> The expanded/exploded capacitors could be just from age, or they > >>>> could be from an output fault on the power supply that caused the > >>>> voltage to go high. That's why I would have tested both power > >>>> supplies offline. > >>>> > >>>> You said it's alive, but you haven't mentioned if it actually works. > >>>> > >>>> By the way, it turns out that I paid dearly for my good luck with > >>>> the repair of my 2077. In the two weeks following that, I got a > >>>> pinched nerve in my back that's still giving me trouble, I broke > >>>> a big chunk off a tooth and am now scheduled for a crown at a > >>>> cost of about $1000, and my big-screen TV died! :( > >>>> > >>>> Ed > >>>> > >>>> ______________________________**_________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/** > > mailman/listinfo/time-nuts< > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.