OK, glad to hear you have your TB working again.
On Sun, Jun 2, 2013 at 11:32 AM, David Hooke <[email protected]> wrote: > > > Azelio, > > I was lucky, it was just the opamp, so the TB is happily driving the MV89 > again. Back to three cornered hat testing! > > The DAC is no more than PWM, so I'm guessing the reference (5V, not as I > thought 4V) and DAC output are sampled by the CPU to get the PWM output > close to what's required. > > One interesting thing: the Trimble oscillator is now dead (ignoring EFC). I > had tried it after the MV89 failure, and it apparently didn't like more than > +/-5V. > > Cheers. > >> and maybe that the DAC's output feeds an OPAMP first, if so then >> replacing the OPAMP should fix the problem... >> >> On Thu, May 16, 2013 at 12:10 PM, David Hooke >> <[email protected]> wrote: >>> >>> >>> OK. >>> >>> This MV89 is mounted on a PCB with SMA connectors for the EFC, REF and >>> 10MHz. I connected the EFC from the TB to the REF out of the oscillator, >>> not >>> for very long, and things haven't been quite right since then. >>> >>> I should not play in the workshop after drinking wine with dinner! >>> >>> It'll be interesting to see how Trimble designed the DAC. There doesn't >>> seem >>> to be much more than a 4V reference, a quad opamp and a bunch of RCs. I >>> guess that as long as it's monotonic, accuracy is not overly important. >>> >>> Cheers. >>> >>> david >>> >>>> Fess up David. Tell the story. >>>> >>>> LOL, >>>> Tom >>>> ----- Original Message ----- From: "Burt I. Weiner" >>>> <[email protected]> >>>> To: <[email protected]> >>>> Sent: Wednesday, May 15, 2013 11:54 AM >>>> Subject: [time-nuts] Embarrassing stuff... >>>> >>>> >>>> David, >>>> >>>> I'm sure it's nothing compared to what I did many years ago to my >>>> Singer FM-10C Synthesizer. You tell us your story and I'll tell you >>>> mine. You're among friends. Every time my life flashes before my >>>> eyes it's mostly embarrassing stuff. >>>> >>>> Burt, K6OQK >>>> >>>>> From: David Hooke >>>>> <dhooke-re5jqeeqqe8avxtiumwx3w-xmd5yjdbdmrexy1tmh2...@public.gmane.org> >>>>> >>>>> Subject: Re: [time-nuts] three cornered comparison tools >>>>> >>>>> Hi All, >>>>> >>>>> I've managed to blow up the DAC output on my TBOLT; it now has about >>>>> 0.5V 42kHz ripple on it. I think I know how I did this, but it's too >>>>> embarrassing to share in public. >>>> >>>> >>>> Burt I. Weiner Associates >>>> Broadcast Technical Services >>>> Glendale, California U.S.A. >>>> [email protected] >>>> www.biwa.cc >>>> K6OQK >>>> >>>> _______________________________________________ >>>> 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. >>>> >>> >>> _______________________________________________ >>> 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. > > > > _______________________________________________ > 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. _______________________________________________ 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.
