Bar code singal regulating circuit

Published:2011/5/13 3:04:00 Author:Nicole | Keyword: bar code, singal regulating | From:SeekIC

This circuit is used to handle the level singal from bar code scanner photodiode, it can change the current output into voltage output in IC1, then it is further amplified by IC2. Amplificative singal is sent to peak value hold circuit, then it will build a reference level, the comparator output is 0 or 1. The peak value of white level or black level should keep long time enough, then it will be read-out by bar code pattern. The difference between peak value is divided by 2 then transported to a output terminal of comparator; and the amplificative singal level is transported to phase reversal inout terminal. If the singal level is higher than reference level, the comparator output is 0, contrarily, the output is 1.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Measuring_and_Test_Circuit/Bar_code_singal_regulating_circuit.html

Print this Page | Comments | Reading(3)