Photo-diode and Photo-transistor Opto-couplers
The 2 components used in an opto-isolator, an optical transmitter like an infra-red emitting Gallium Arsenide LED and an optical receiver like a photo-transistor are closely optically coupled and use light to send signals and/or information among its input and output. This allows information to be transferred among circuits without an electrical connection or common ground potential. Opto-isolators are digital or switching devices, therefore they transfer "ON-OFF" control signals or digital data. Analogue signals can be transferred via frequency or pulse-width modulation.
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