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Ralph Mowery

In article ,
says...

Hello, and I already addressed your other post. I think a crystal is
probably likely. You said it was unlikely but don't offer sensible
reason(s) why (e.g. temperature and vibration stability, etc)

cost, as I said.

The cost of small microprocessors and crystals are almost nothing. Look
at the Arduino processor boards. They can be bought from China for
about 2 ot 3 dollars. They are powerful enough to run the inverter part
of the inverter.