Is the capacitor drawn or wired wrongly?

The capacitors marked red are too small to be electrolytic. They must be ceramic. They just used same symbol for all capacitors except without the plus sign.


It's actually a common misconception that the curved side means negative or that the curve signifies an electrolytic. The + sign is supposed to be used to indicate polarity. Any specific meaning of the curved side, if there is one, depends on the situation.

IEEE Std 315-1975:

2.2.1.1B - For style 2, if it is necessary to identify the capacitor electrodes, the curved element shall represent:

a) The outside electrode in fixed paper-dielectric and ceramic-dielectric capacitors;

b) The moving element in adjustable and variable capacitors;

c) The low-potential element in feed-through capacitors. (IEC Preferred)


It looks like lazy symbol use. Those motor noise suppression caps and the crystal caps should be ceramic caps which are non-polarized. You'll have a hard time finding 33pF or 0.1uF electrolytic caps anyways. I don't think they exist.