Based on my experience (having destroyed way too many circuits), R/C
switches need safeguards to keep the logic and load side completely
separated. Relay-based switches provide the separation naturally.
FET-based switches need an opto-isolator to achieve the same isolation.
The PIC also needs some input filtering to work reliably with some of
the newer 3.3v receivers when using a servo cable longer than 12 inches.
A good-old op-amp or driver chip works well.
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