Tiny 1.0 uF's

[pickdropper]

What does NPO mean?

It's the material used in the ceramic caps.  NP0 are are the least sensitive to temperature and voltage fluctuations.  They also don't lose capacitance over time, like other ceramic caps.

Usually X7R or X5R are sufficient, but even those can lose quite a lot of their rated capacitance as you approach their maximum voltage level.

I find this to be a well-written article on the subject:

http://www.johansondielectrics.com/technical-notes/product-training/basics-of-ceramic-chip-capacitors.html

[billstein]

Thanks everyone