Who would have thought a seriously leaky cap c7 on the input of U1a pin 3. Roughly 10K ohm. System is running at 1.6 x10^11. See if it hangs in there. Lamp is actually going higher in voltage at 8.2 V. All in all a good experiment. Regards Paul.
On Sun, Feb 13, 2011 at 1:46 PM, paul swed <[email protected]> wrote: > Startup circuit looks like a bad op amp used as a comparator. U1 section a. > This is a LM 158. I have a LM 148 on hand suspect they are different in > temperature quality. So will look it up and see. This is a common op amp so > if the 148 does not work for some reason any numbers of more modern ones > will. Accept one issue its a T08 can. What pin was 8? ;-) > Regards > > > On Sun, Feb 13, 2011 at 1:24 PM, Magnus Danielson < > [email protected]> wrote: > >> Dear Paul, >> >> >> On 13/02/11 18:50, paul swed wrote: >> >>> Magnus it indeed does look very good. >>> >>> I have re-assembled the various boards and the system locked up as normal >>> after the warm up period. I do indeed have a failure in the lamp control >>> startup crkt. >>> >> >> My R&S does not have a startup circuit, so I can't help on that particular >> detail. I'm sure you will debug it yourself. >> >> >> The reference after warm up and adjusting the c field is down in the >>> 1x10-11 >>> area. Anyhow I adjusted the c field and the systems not fully assembled >>> nor >>> has it really been stabilized long enough. Was simply curious so I do not >>> think this is really a very accurate assessment. Especially since this is >>> time-nuts territory. >>> >> >> At least it proves that you are up and running at least, modulus quirks. >> >> >> So next steps is to let the unit cook in or maybe I will further assemble >>> it >>> and troubleshoot the startup crkt. Add the unlock counter. (A pedometer >>> and >>> opto coupler) and let the system run for a long while perhaps a week or >>> so >>> to see what really happens. >>> >> >> Sounds like a plan. >> >> >> Thanks for your guidance and help Magnus. Who would have thought there >>> was a >>> recovery technique for FRS-c RB references. >>> >> >> Happy to help. Happy to learn of your progress! Happy to hear I >> contribute. >> >> >> Cheers, >> Magnus >> >> _______________________________________________ >> 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.
