Recorder to microcomputer translation circuit

Published:2011/5/12 4:10:00 Author:Nicole | Keyword: recorder, microcomputer | From:SeekIC

The input singal of this circuit comes from the loudspeaker of recorder or the earphone jack, then it is transformed to microcomputer. Green LED indicates singal level, red LED indicates work state. Adjusting volume knob and lighting up LED means the input amplitude reaches 2.5V, then the anti-jamming ability is higher. The input singal is transported to microcomputer by two levels TTL inverter and emitter follower.



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