DICE_OR_ROULETTE_RUNDOWN

Published:2009/7/7 21:39:00 Author:May | From:SeekIC

4046 PLL connected as VCO is set at twice desired maximum rate for dice or roulette-wheel counters. Pressing spin button momentarily to start action charges 1-uF capacitor to sypply voltage and jumps VCO to highest frequency. Output frequency then decreases rapidly as capacitor is discharged by 10megohm resistor. Output is stopped by using retriggerable mono to drive other half of 4013 dual D flip-flop. When frequency drops below value at which monotimes out, mono resets flip-flop and holds it to stop display.-D. Lancaster, CMOS Cookbook, Howard W. Sams, Indianpolis, IN, 1977, p 252-254.



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