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 <[email protected]> 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 <[email protected]> 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: [email protected] >>>> [mailto:time-nuts-bounces@**fe**bo.com<http://febo.com> >>>> <time-nuts-bounces@febo.**com <[email protected]>>] >>>> >>>> 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 -- [email protected] > 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
