Opto-electrical isolator input protection circuit

Published:2011/4/13 8:49:00 Author:Nicole | Keyword: Opto-electrical isolator | From:SeekIC

This circuit combines diode with transistor, when the input voltage is in the range of DC 3~30V, the input current of MOC3011 photoelectric isolator LED is limited in the security limit value 15mA. In the case of polarity reverse connection occasionally, this circuit also can protect LED.



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