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C1 + C2
0.01 uF capacitor
These capacitors make up the second half of the PWM filter (along with R2 and R3 ). These capacitors have short leads, and look the same as C6 and C7; therefore take special care to ensure that these are the proper capacitors. If you do not have a multitester, you can identify these by the marking 103 on the side. They have no polarity.