[sdiy] input buffer question

[David G. Dixon]

I want to put a simple non-inverting buffer on my altered version of the CGS
analog shift register, between the input and the first DG409 multiplexer.

My question is this:  Is there a standard operating procedure for applying
spike protection resistors on such input buffers?  I'm thinking 10k
resistors at the input and in the feedback loop, and nothing to ground.  Is
this necessary/sufficient, and will it affect the accuracy of the subsequent
S&H?