NP0 and X7R

[Koala]

Is there any advantage in using NP0 capacitors instead of X7R in the Quasar ARM


or is it not worth the extra cost

[dbanner]

Not worth extra cost is me opinion. Stability in relation to temperature variation should not be a factor +-10 degrees. All caps of same type will vary by same factor, overall circuit not really affected since calculated values during design are rounded to nearest commercially available value anyways. The overall circuit has built in tolerance.
Super stable precision capacitors are for high end lab test equipment which cost tens of thousands of dollars.
Unless you treasure seeking down in volcano or at North Pole, temperature stability not really an issue.
Then again, I live in mild tropical climate, no issues for me with cheap ceramics.

[Koala]

There's also the

piezoelectric effect ?

Probabley worth putting them in as the 50V versions are only 7p each very little added to the over all cost.

Any one know the max voltage on the Tx of the Quasar ARM