| 摘要 |
<p>The coin selector employs a coin detector, which supplies an output signal dependant on the dia. and metal composition of the coins. The output signal is supplied to an AND gate (3), via an A/D converter if the output signal is in analogue form, the other input of the AND gate (3) coupled to a clock pulse generator (4). The recorded count value of a counter (5) coupled to the output of the AND gate (3) is stored by a register (6). A programmed passive memory (7) stores the limit values of valid coins and receives the information from the register (6), to supply a signal representing the coin characteristics to an output register (10). Pref. a logic comparator (8) and a logic circuit (9) are also included.</p> |
