Circuit to inhibit attempts to defraud owner of gambling machine, involves use of high frequency receiver which inhibits coin payout by machine when under attack by high frequency pulses

摘要

High frequency pulse generators are sometimes used by fraudsters to trigger the discharge of coins, when no winnings are appropriate. The present circuit (1) has a high frequency receiver (2). The output of the receiver is fed to a 'hold' circuit. The hold circuit lights an alarm LED (D2) and a relay (RL). The relay cuts off the supply to the coin payout mechanism.