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In audio systems or sensor networks, two circuits might have different ground potentials. Connecting them directly burns traces. Placing an optocoupler between the sensor's ground and the microcontroller's ground breaks the loop while passing data.
: Isolating power transistors and feedback elements.
: Protecting low-voltage control systems from the high voltages used in AC or DC motor drives.
Standard optocouplers like the 4N35 are slow (µs range). They cannot pass high-speed data (e.g., I²C at 400 kHz or SPI at 10 MHz). For high speed, use dedicated logic optocouplers (e.g., 6N137).
In audio systems or sensor networks, two circuits might have different ground potentials. Connecting them directly burns traces. Placing an optocoupler between the sensor's ground and the microcontroller's ground breaks the loop while passing data.
: Isolating power transistors and feedback elements.
: Protecting low-voltage control systems from the high voltages used in AC or DC motor drives.
Standard optocouplers like the 4N35 are slow (µs range). They cannot pass high-speed data (e.g., I²C at 400 kHz or SPI at 10 MHz). For high speed, use dedicated logic optocouplers (e.g., 6N137).