INFRARED_CODE_PRACTICE_RECEIVER

Published:2009/7/12 20:47:00 Author:May | From:SeekIC

An IR phototransistor, Q1, is directly-coupled to the input of op amp IC1-a. The output of IC1-a is fed through the gain-control potentiometer R9 to the input of op amp IC1-b, which has a voltage gain of 10. Section IC1-b's output drives IC1-c, which has a voltage gain of 100. The output of IC1-c supplies audio to the heddphones via J1. The IR phototransistor can be mounted in reflectors to increase the CPO's operating range.



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