[sdiy] bypassing caps

[Nils Pipenbrinck]

Hi again.

Since I have to re-design my asm-1 vco pcb anyways I thought about improving
it a little bit. I want to add more bypass caps. Right now I have two 10µF
caps from the rails to ground directly beneath the power connector. I also
routed the rails and the ground seperately for each "part" of the circuit
and connected them at the power supply connector. I think that's the best
way to make the supply lines as clean as possible.

Now I think about adding small bypass caps at the power supplies of the
opamps and especially at the LM311 voltage comparator. Maybe that's not
nessesary, but at least it won't hurt, right? Is a 10nF ceramic a good
choice here?

Also I wonder about bypassing in general: I always bypass from rail to
ground, but never from rail to rail. That's the way it is done in all
circuits I've seen. Does a rail to rail bypass cap has no effect or is not
important (or does it even hurt stability?)

Many thanks,
    Nils Pipenbrinck