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A decoder is a component with an electrical capacitor inside that stores electricity and quickly releases it at a steady rate. With LED lights and their low power draw, decoders are used to mimic the way the factory incandescent bulb behaves. The storage of power within the decoder also creates a load on the circuit due to the build-up of electricity. Decoders can be thought of as a water dam where a large portion of the water is held behind it, but it is slowly released downstream so it does not flood the upstream portion.