Bypass caps

[uncle_bob]

Hi

One of the things that the Murata manual shows are plots of the field around the power traces. Dave has a set of probes (and an amp) that pop up in various videos. They are very useful (and a bit pricy) for figuring this sort of thing out.

Bob

[jnz]

Here's pretty much all you could ever want to know about bypass caps, from Murata: http://www.murata.com/~/media/webrenewal/support/library/catalog/products/emc/emifil/c39e.ashx

That's a really great link! Worth the read.

[dannyf]

how do you make these decisions?

All you need to make sure is that the bypass cap is sufficiently fast - they are there for the transients. I have a ton of .1uf but sometimes I have used small eletrolytics as well.