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    • 10. 发明授权
    • Counterfeit coin detector circuit
    • 假冒硬币检测电路
    • US4846332A
    • 1989-07-11
    • US162190
    • 1988-02-29
    • Thomas Quinlan
    • Thomas Quinlan
    • G07D5/08
    • G07D5/08G07D5/02
    • A counterfeit coin detector circuit comprising an constant frequency and voltage maxima and minima square wave oscillator input to a tank circuit including an inductive probe and an adjustable capacitance. The tank circuit is driven at a fixed and stable frequency and has a variable peak to peak AC output voltage amplitude which is a function of the characteristics of the coin under test. The AC output of the tank circuit is converted to a DC voltage correlated to the peak to peak AC ouput from the tank circuit. A group of window detector circuits are employed to determine whether the DC voltage output falls within certain preset ranges corresponding to the presence of particular coins. The presence or absence of a window detect can be used to accept or reject the coin or to otherwise take appropriate action with respect to the coin under test. The circuit is capable of being retrofitted into standard toll booth coin collecting systems and provides a simple and very rugged circuit for detecting counterfeit coins or slugs which is also very temperature stable.
    • 一种假冒硬币检测器电路,其包括输入到包括感应探针和可调电容的储能电路的恒定频率和电压最大值和最小方波振荡器。 储能电路以固定和稳定的频率驱动,具有可变的峰峰值交流输出电压幅度,这是所测硬币特性的函数。 油箱回路的交流输出转换为与油箱回路的峰 - 峰交流输出相关的直流电压。 使用一组窗口检测器电路来确定DC电压输出是否落在与特定硬币的存在相对应的某些预设范围内。 可以使用窗口检测的存在或不存在来接受或拒绝硬币,或者对于被测硬币采取适当的动作。 该电路能够被改造成标准的收费站硬币收集系统,并提供了一种简单而非常坚固的电路,用于检测也非常温度稳定的假币或s。。