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I'm trying to understand a schematic of an RFID reader.

Circuit: RFID erader

What capacitors are used - electrolytic or ceramic capacitors?

I've seen schemes of RFID readers that use electrolytic capacitors, but in this scheme I can't see the "+" side of any capacitors.

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  • \$\begingroup\$ Those capacitors are small, so, you will not even find electrolytic capacitors with those values. \$\endgroup\$ – abdullah kahraman Feb 22 '13 at 13:43
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I would venture an educated guess that these are ceramic capacitors.

  • It's extremely unlikely that capacitors below 1 microfarad (in general) are electrolytic
  • The symbols in the schematic also imply non-polarized capacitors
  • C3 and C5 are used for coupling, which isn't a good (or safe) use for polarized electrolytic capacitors
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I think there are ceramic capacitors, for they are small in capacity.

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  • 2
    \$\begingroup\$ I completely disagree. \$\endgroup\$ – Adam Lawrence Feb 22 '13 at 13:54
  • \$\begingroup\$ @Madmanguruman, sorry! I have typed the wrong key word! forgive me!! \$\endgroup\$ – LaiJiong Feb 22 '13 at 14:16
  • \$\begingroup\$ You corrected your answer, which is the most important thing. \$\endgroup\$ – Adam Lawrence Feb 22 '13 at 17:27

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