5_DIGIT_PRESET_COUNTER

Published:2009/7/11 5:24:00 Author:May | From:SeekIC

Basis of circuit is Motorola CMOS real-time MC14534 five-decade counter containing five ripple-type decade counters whose outputs are time-multiplexed by intemal scanner. Time-base oscillator pro-vides 10-kHz crystal reference for clocking counters. Total current drain of system is 65 mA from 5-V supply. When used to control quantity of items placed in carton, each item interrupts light beam of photoelectric system to give count. External trigger output is connected to control mechanism that advances conveyor belt when box is full. Quantity of items desired per box is dialed on thumbwheel switches. Dis-play is used to indicate number of boxes filled. Other applications include count and display of number of interruptions of light beam, mea-surement of conveyor speed, and measurement of log lengths in sawmilL-A. Mouton, Five Digit Accumulator/Elapsed Time Indicator, Motorola, Phoenix, AZ, 1975, AN-743 p 3.



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