I'm working on a project right now where I run the output of the PIC
oscillator (8 MHz) from one side of the resonator to a couple Maxim SPI
UARTs. I see no evidence of loading the oscillator.

In another project, I used a dual varactor as the load capacitors on a
crystal on a PIC oscillator. The output side of the oscillator goes
through a 10k resistor to an op amp voltage follower to a BNC on the front
panel. This allows the user to adjust the PIC oscillator frequency to
exactly 10MHz. This also seems to have worked fine.

Harold


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