DIGIT_SHIFTER_FOR_DISPLAY

Published:2009/7/1 19:50:00 Author:May | From:SeekIC

Circuit takes BCD output from 10-key keyboard and shifts each number, as entered, from right to Ieft on display panel. Intemal clock is not used. Keyboard strobe is delayed 2 ms to allow Ume for keyboard switches to stop bouncing. BCD outputs from G5-G8, go directly to 7- or 10-segment decoder driver, such as SN7447 decoders driv-ing RCA DR-2100 series low-voltage readouts.All resistors are 220 ohms. Capacitors for G1B and G1D are 1000 pF,and capacitors for othergates are 240 pF Article traces circuit operation，－T .O'Toole,Transfer Paranel Information Without a clock,EDN Magazine， Aug.1,1972,p 59.



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