| 摘要 |
<p>PURPOSE:To relatively inexpensively introduce an IC to circuits by composing a modulating circuit of a decoding circuit, which decodes a data signal from a microcomputer, and a flip flop, which mixes the output of the decoding circuit and a clock pulse. CONSTITUTION:At least a pair of flip flops 6 and 7, which insert the clock pulses from an oscillator 9 to respective clock inputs, and a decoding circuit 8, which mixes the output of one of the flip flops 6 and data outputted from a microcomputer 1, outputs a decoded signal, and produces the output to the data input of the other flip flop 7, constitute a modulating circuit 5. In addition, the output of the modulating circuit 5 is inserted through an output gate 10 and an amplifying circuit 11 to the magnetic head, and at least the flip flops 6 and 7 and the decoding circuit 8 are composed of a single PLD (Programmable Logic Decice). Thus the write signal to a magnetic card can be prepared in a relatively simple circuit configuration, and the costs of the circuit part can be reduced.</p> |
