[sdiy] Module input isolation?

[John Speth]

Hi list!

Is there any kind of isolation needed to protect silicon devices that serve
as inputs to the outside world?

Let's say I have a synth module that uses an LM311 comparator.  And the
input to this module needs to go directly one of the LM311 input pins.  Does
this pin need any protection circuitry?  I'm afraid I'm not familiar with
any kind of bad stuff that might happen at that pin.

I'll probably hang a 1M resistor to ground to keep it from floating when not
connected.

Thanks, John Speth
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