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Download Digital Design for Computer Data Acquisition by Charles D. Spencer PDF

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By Charles D. Spencer

This electronic electronics textual content specializes in ''how to'' layout, construct, function and adapt information acquisition structures. the cloth starts with easy good judgment gates and ends with a forty KHz voltage measurer. The method goals to hide a minimum variety of subject matters intimately. the knowledge acquisition circuits defined speak with a number laptop via parallel I/O ports. the basic suggestion of the publication is that parallel I/O ports (available for all well known desktops) supply a great stability of simplicity, economical, velocity, flexibility and suppleness. All circuits and software program are completely verified. development information and troubleshooting instructions are incorporated. This booklet is meant to serve those that train or examine one of many following: electronic electronics, circuit layout, software program that interacts outdoors undefined, the method of computing device dependent acquisition, and the layout, model, development and trying out of size structures.

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The outputs undergo the following pattern. imal D 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 c0 B0 A0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 As can be seen from the A column, every time the count advances, bit A reverses (toggles). Bit B toggles every time bit A goes low; bit C toggles every time bit B goes low; and bit D toggles every time bit C goes low. 36 presents the count timing pattern. Although not required, COUNTS-IN is a periodic clock.

27. Timing diagram for the toggling operation showing the 7474 gate delay. The time scale is greatly expanded. 0000 MHz digital clock . 28. Timing diagram showing how a toggling flip-flop divides a clock frequency by 2. 0000 MHz digital oscillator. The output is also a clock with twice the input clock's period. 00 KHz. Additional flip-flops could further divide the frequency as desired. 7 shows how multiple toggling is the basis for digital counters. 6 Synchronization A common problem in measurement and control circuits is synchronization between a START signal and a continuously running CLOCK.

3. a. What happens if two switches go active simultaneously? b. When So is deactivated, what happens if S3 is active? 28. Sketch a circuit which encodes 16 switches using two 74138's. 29. 4). 30. 3. Connect the counter output CBA to LED's. Use the breadboard clock set at 10 KHz and use logic switches for S3, S2, Sx and So. 4. Exercises 51 31. Test a 74152 multiplexer as follows. Connect the select inputs (CBA) and Do to the breadboard system's logic switches. With CBA = 000, see if W* is the inverse of Do.

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