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The thing to keep in mind about optical compressors is that the materials used in their construction greatly affect how they behave. As the light source illuminates, the resistor causes the compressor to apply compression, and when the light source dims, the amount of compression applied is reduced. An optical compressor’s input signal illuminates a light source-the more powerful the input signal, the brighter the light will shine. Optical compressors, or opto compressors, rely on a light-dependent resistor and a light source to dictate the way in which compression is applied.