FYI

In follow-up work on my clock board using the PIC internal oscillator, I varied the supply to my on-board regulator, and found the internal oscillator varies significantly. I did not think of doing this before, but I had some PS problems and with my counters set accurately to a 5V supply I varied the source from ~3V-15V and found the timing off by 50% to ~500%.

Not a huge suprise, but just some insight to consider if anyone else has timing issues. The internal RC appears more sensitive to supply than temperature. And since various designs affect the supply, you will also be changing your timing significantly.


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