A process for the reduction of the incorrectly money risk during the operation coin-operated automatic manipulating units and coin acceptor for carrying out the method

摘要

In order to render counterfeiting of coins uneconomic, the invention proposes the manufacture of coin testers with different characteristics between individual coin testers, so that a false coin which happens to be acceptable to one individual coin tester will nevertheless be rejected by another coin tester. It is preferred to vary the characteristics of individual coin testers by varying the ratio between an input capacitance and an output capacitance of a push-pull oscillator. Genuine coins should produce the same output from all the coin testers, whilst false coins produce different outputs from the individual coin testers.