Arduino Ethernet Board Hardware Problem

Development Other Hardware Development
1

Hi,

I am currently modifying and developing based on arduino ethernet board to interface with a relay and fpc connector.

I would like to ask regarding this component :
5 10u CPOL-EUSMCB SMC_B C8, C11, C13, C18, C19 POLARIZED CAPACITOR, European symbol

I realized these are the decoupling capacitors for the arduino ethernet board.
However, based on my observation these capacitors on the original board are non-polarized capacitors.
May i know should i be using a polarized one or non-polarized capacitor in this part?

Many thanks

2

Typically decoupling caps are ~100nF - I'd be inclined to think these are tank caps for the power supply instead.

Regardless, it doesn't matter whether you use polarized or non-polarized, as long as the orientation is correct :slight_smile: You could use 10uF ceramics, which are (almost always) non-polarized, or you could use 10uF aluminum caps, which are (usually) polarized.

3

I see, this means that if i use non-polarized cap, the orientation doesn't matter and when i use polarized cap, the orientation matters right?

4

Exactly!

5

thanks for the great help :slight_smile: