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(第二部分) 虽然本文引用的部件号都指的是Motorola公司的器件,但其中大多数元件也可以很容易通过其它各个渠道买到。即设计完全使用标准逻辑。发射机使用四路多工制——输入“与非”门为了提供参考格式,发射机的略图(图1)示出了满足第一部分给出的方框图提出的各功能的一部分电路。正如图所示的,SN74LS40四路多工制输入“与非”门(级联连接)完成发射机的逻辑接口功能。选用LS-40是供这种用途的一种好的选择,因为其缓冲输出可以输出24毫安(而不是一般
(Part 2) Although part numbers referenced in this article refer to Motorola devices, most of them are also readily available through various other sources. Design that uses standard logic completely. Transmitters Using a Four-Way Multiplexer - Input NAND Gate In order to provide a reference format, the transmitter's sketch (Figure 1) shows part of the circuit that fulfills the proposed functions of the block diagram presented in Part One. As shown, the SN74LS40 four-way multiplexed input NAND gate (cascade connection) completes the transmitter's logical interface function. The LS-40 is a good choice for this application because its buffered output can output 24 milliamps (rather than the usual