I never seem to be able to find any good rules of thumb on bypass caps. Hoping for some hard guidelines.
Ok, it seems .1uf is the value I hear allot. Should I just slap that on everything? How does one know if that's wrong?
Ok, next, I'm currently using the atMEGA328. It has several pins for Vcc. Would I just put one cap across the rails close to the chip still?
Ok, I'm also using an AD75019 cross point switch chip. It uses separate analog and digital rails. I feel that maybe .1uf near the digital Vcc pin, and a larger electrolytic of some sort on the analog (audio) rails would be right, but I'm really just guessing.
What about opamps? No digital there, so would you not worry unless they are noisy?
I'm assuming well regulated power supplies for all of this if it's relevant.
Finally, I plan to have a smattering of shift registers for input purposes. .1uf on each?
To summarize, how do you make these decisions? I feel the datasheet for each chip should have a suggestion, but I never see that.