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Optocoupler circuits

2017-09-02 17:18  
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This circuit is a TTL-to-TTL isolator circuit. The driver circuit is an open-collector TTL inverter (Ul). When the input is high, then the output of the inverter is low. Thus, when the input is high,
Optocoupler circuits

the output of Ul grounds the cathode end of the LED and causes the LED to turn on.

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