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input protection with optoelectronic isolator circuit

2016-09-25 07:16  
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input protection with optoelectronic isolator circuit
This circuit combines diode and transistor together.When the input voltage is between 3 and 30V,the incoming current of LED of the optoelectronic isolator MOC3011 is limited to a secure ultimate value that is less than 15mA.If the polarity is set reversely by accident,this circuit can also protect the LED.