Ceramic capacitors.

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Ceramic capacitors

Ceramic capacitors use a ceramic dielectric and are cheap and fairly stable over temperature and they are useful for tuning and timing applications.

You may come across the following terms:

NP0, X7R, Y5V, Z5U

These refer to the type of ceramic dielectric material used in constructing the capacitor.

NPO is stable over temperature and the most expensive but you'll need it for creating a stable RF circuit i.e. one that does not drift off in frequency when the temperature changes.

X7R is the next best having a 15% tolerance over -55°C to +125°C
Y5V has the following spec: -82%, +22%- over 30°C to +85°C
Z5U has the following spec: +22% - 56% over +10°C to +85°C

Note: Normally you won't have to worry about the type but when you get to RF design or accurate tuning then you may need to specify accurate capacitors to ensure that the filter stays at the right frequency.

Note 2: Another accurate capacitor type to look at is polystyrene.

Get some bargain ceramic capacitors from Ebay

Here's a selection of ceramic caps that you can buy on Ebay.

Just click on the capacitor you want and start bidding.

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