R26 added in series with C33 because when it was only C33 the peak voltage of the positive feedback (hysteresis)
was outside the save range for the comparator inputs.  R26 and C33 provide short positive feedback pulses
which helps keep the comparator from self-oscillating.

R27 added across C5:  There seemed to be some instability in start up, sometimes the TL3116 would start off with
output HI, sometimes output LOW.  R27 restores proper bias to the comparator input by discharging the DC offset that may 
be left across C5.  I picked 100k for R27, but perhaps values as low as 10K may be required, i would not suggest going
lower than 10k.