Light pipe amplifier circuit

Published:2011/4/24 7:11:00 Author:Nicole | Keyword: light pipe, amplifier circuit | From:SeekIC

This circuit is composed of light pipe and four operational amplifiers IC1. IC1a is operational amplifier, using silicon diode's exponential positive conductivity to change the light pipe output to logarithmic voltage change, its peak-peak value is in direct proportion to the ratio of white and black light current, it is irrelevant to the absolute value. IC1b is comparator, the output of amplifier IC1a is rose to fixed level by IC1b and peak value detector. So the singal is transferred into the microprocessor needed binary digital output. The output is compatible with TTL.



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