[sdiy] Taming things that run to the rails...

[David G Dixon]

> Is it considered good practice to limit signals (where 
> possible) that would otherwise try and head for the rails 
> under normal operating conditions? i.e. Comparator outputs, 
> some integrator outputs perhaps?
> 
> I guess I'm referring mainly to trying to keep op amps out of 
> saturation by using zeners across the feedback path.
> 
> Good? Bad? Vital? or Don't worry about it unless it's causing 
> problems?

Generally, I let opamp comparators run to the rails, and have never had
problems.  Otherwise it never really comes up as an issue.