10O_LED_SOLID_STATE_OSClLLOSCOPE

Published:2009/7/1 23:18:00 Author:May | From:SeekIC

Flat display of LEDs replaces cathode-ray tube of oscilloscope. Suitable for classroom demonstrations even though resolution is poor. Amplified input signal is fed to upper ends of all ten vertical columns of LEDs. Under control of time base, scanner completes circuit at bottom of each column in turn. Vertical columns are made voltage-sensitive by resistors paralleling LEDs.Gate circuit using section of 7400 provides triggering when desired. Vohage-sensitive bargraph readouts formed by vertical columns are scanned by 7490 decade counter and 7441 decoder. Sweep rate of display is adjustable from 1 to 20 vertical columns per second with R5.-F，M Mims, Electronic Circuitbook 5： LED Projects, Howard Sams,Indianaplis,IN,1976，p 92－96.



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