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microcontroller - How to design an AC current detection ... 1. Simple diode-drop current sensor with opto-isolator. The diodes drop a maximum of about 2.1 to 3 volts depending on current. OPTO1 is a bi-directional LED opto-isolator. These have infra-red LEDs internally and so forward voltage drop is about 1.2 V. R1 will limit the current to 10 mA.

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