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Versatile RGB LED PWM Driver

Step 8Assembly Step 5. C3, C4

Assembly Step 5. C3, C4
Next we install capacitors C3 and C4, they are marked 100uF 25V

These are electrolytic capacitors and need to be fitted the correct way round.

If you look at the leads on the part, one is longer than the other.
The long one is the + lead
The short one the - lead

Now if you look at the PCB, there is a + next to one of the two holes in the PCB. You must fit the capacitor so that the long lead goes in to the hole marked +

The photo should make this clear
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