Somewhere in the depths of boxes (if no lost is a fire about 25 yrs ago) are a few B7700, BSP and AFP boards that followed me home. The BCM chips my guess are now quite rare., Some of the boards have (had?) Motorola ECL.
-pete On Mon, Sep 9, 2013 at 3:42 PM, paul swed <paulsw...@gmail.com> wrote: > You have some cml in the basement right? > Regards > Paul > > > On Mon, Sep 9, 2013 at 5:51 PM, Pete Lancashire <p...@petelancashire.com > >wrote: > > > Lethal was dropping a conductor across the buss bars. If it was not the > -2V > > it > > was -5.2V. I can't remember but it was at least 75A more like 100A. > > > > The power supplies were in the bottom of the cabinets and tin plated > copper > > buss bars would run up the side of the back planes. > > > > The back planes where wire wrapped and we were suppose to shut the power > > off > > when making a change. A bit of 30 gauge wire didn't matter but a manual > > wire wrap > > tool made some pretty interesting sparks. That caused a fault. > > > > Another had metal framed glasses. Did not even cause a hiccup to the test > > program > > that was running. > > > > Ah the good days of CML, Current Mode Logic. at Burroughs. > > > > -pete > > > > > > On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens <ma...@non-stop.com.au > > >wrote: > > > > > 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. > > > > > _______________________________________________ > > 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.