Optocoupler test circuit example

An optocoupler test circuit verifies electrical isolation while transferring signals safely between two sides. When input voltage drives the LED inside the optocoupler, it emits light that activates the phototransistor on the output side. This allows signal transmission without a direct electrical connection, protecting sensitive circuits from noise and high voltage. It is commonly used in power electronics, microcontroller interfacing, and industrial control systems.

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