ADJUSTABLE_ODDS_LORRERY

Published:2009/7/13 2:48:00 Author:May | From:SeekIC

Odds for lottery are set by diode matrix connected to output of 4040 counter. Range is from 1 :2 to 1 : 1024. To use, close scramble switch for a second or two to make free-running oscillator drive counter at high rate, then let contestant hit toueh plate to trigger flip-flop that advances counter one step. If counter was frozen at next to last connected diode, next diode is biased off and Q2 energizes buzzer. For 50-50 odds, connect only diode at output Q1. For odds of 1 in 10, connect diodes only to outputs Q2and Q4 for binary 1010 or 10. With all diodes connected as shown, odds are 1:1024.-J. Sandier, Play 'Random Chance,' Modern Electronics, Oct. 1978, p 42-43 and 88.



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