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A snubber is a circuit used to suppress transient voltages in electrical circuits. It can include RC snubbers that comprise a resistor and a capacitor in series, often used for AC circuits, and also a diode used across relays and other inductive components to suppress their inductive 'kickback'.

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Reducing LED PWM Noise: Which is the best option?

The PCB traces will still be radiating RF. c) This looks like a snubber circuit meant to save switch contacts from inductive kickback. …
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