The attachment contains part of a schematic that contains a MCU that has an external xtal. If someone has the time, can you explain how the values of the two parallel capacitors are determined?
Will a ceramic resonator be accurate enough - I'm using it for an electric motor tachometer? I would like the tachometer to be as accurate as I can make it.
I have a FOXLF100-20 oscillator on hand – will it be okay?
Gramo, ceramic resonators are less accurate and stable than crystals, not more. The crystal will work just fine. If you need to fine tune the exact frequency of the crystal you can use trimmer caps, but calibrating the whole setup can be a bit finacky.
Gramo, ceramic resonators are less accurate and stable than crystals, not more. The crystal will work just fine. If you need to fine tune the exact frequency of the crystal you can use trimmer caps, but calibrating the whole setup can be a bit finacky.
Yes, crystals are FAR more accurate and stable than ceramic resonators, the capacitors used on the crystal are very non-critical - anything from 10pF to 47pF usually works fine.
The ceramic resonator is often used instead of crystal because of it's lower price. The frequency accuracy is not as good as a crystal but in many application the accuracy is not critical.
But they are cheaper (certainly in production quantities) - and for many applications the extra accuracy of a crystal isn't required. Personally I've never bought one, but I have used them occasionally, taking them out of old TV's - it saves you looking out a couple of small capacitors!.