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Optically isolated input protection circuit diagram

2016-09-17 16:53  
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Optically isolated input protection circuit diagram
Diodes and transistors form the circuit, when the input voltage range is 3 ~ 30V DC, the input current of MOC3011 optical isolator LED is limited to be less than the safety limit of 15mA. In the case of reverse polarity accident, the circuit can protect the light-emitting diodes.