Hi The gizmo you want is a hot air rework tool. They are not all that expensive ( < $200 for a fancy one, quite a bit less for a simple one). They normally come with a bunch of tips. That lets you “focus” the heat on the part you want to pull.
One of an infinite number, randomly chosen: https://www.amazon.com/gp/product/B006FA481G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 <https://www.amazon.com/gp/product/B006FA481G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1> Bob > On Oct 31, 2020, at 8:42 PM, paul swed <paulsw...@gmail.com> wrote: > > Jim > Thanks for the details. I took a serious look at popping the xtal out and > am afraid its a bit beyond me since there are 4 pads that need to be > heated. I have worked on very small stuff under the microscope. But this > seems problematic. I sort of thought all the bits would get upset. No free > lunch. > No matter not popping the xtal. Mainly because if anyone else did want to > build the magical solution it would be as bad as soldering lots of chips. > Super fine wires to very small pads. > But at least at the moment perhaps thats not critical to developing > something. > I did tinker with delay and will need to use a scope at this point to see > the effects. > Regards > Paul. > > > On Sat, Oct 31, 2020 at 7:35 PM jimlux <jim...@earthlink.net> wrote: > >> On 10/31/20 11:42 AM, Bob kb8tq wrote: >>> Hi >>> >>> …..errr….. >>> >>> Can you pull the clock oscillator off the Teensy board? (Yes, the >> soldering >>> iron would be involved). >>> >>> Will the clock input to the MCU accept something like 10 MHz? If so >> solder >>> on a cable …. >>> >>> At that point whatever the Teeny does is locked to the 10 MHz. If that >> comes >>> from one of the $3 eBay OCXO’s, steer that with a DAC output … now you >>> have a WWVB GPSDO. >>> >>> Indeed, if the Teensy needs 28 MHz, then the OCXO will not be quite as >> cheap. >>> >>> Bob >>> >> >> I've tried this - It will run just fine, but *all the UART and USB >> speeds change*. So, basically, the USB stops working, and you need to >> set your serial port to something like 112.8 * 10/28 (and it takes a bit >> of fiddling to get it to work right).. I sort of cheated, and switched >> back and forth - signal generator to 28MHz, load and debug software, >> start it, then switch generator to 10 MHz. >> >> And of course, all the functions that are time based, like delay() are >> the wrong length. >> >> One could probably figure out a relatively few patches to the >> Teensyduino code base that would fix all this (clock rate is a variable >> - you can run the teensy at multiple clock rates, even with the same >> crystal) >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.