Electronics

By David L Buchla

Experiments for electronic basics

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Extra info for Experiments for Digital Fundamentals

Example text

The symbols are shown in Figure 4-3 (f) and (g). The output of the XOR gate is HIGH when either A or B is HIGH, but not both (inputs “disagree”). The XNOR is just the opposite; the output is HIGH only when the inputs are the same (agree). For this reason, the XNOR gate is sometimes called a CO­ INCIDENCE gate. The logical operation of any gate can be sum­ marized with a truth table, which shows all the pos­ sible inputs and outputs. The truth tables for INVERT, AND, OR, XOR, and XNOR are shown in FIGURE 4-2 Examples of assertion-level logic.

1 \ -----1___/ TABLE 4-3 NOR gate. Inputs Output A B 0 X Measured Output Voltage -----T ^ j o — ----Inputs Output A B 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 TABLE 4-4 Truth table for Figure 4-4. rH ~~ Input Output A X \ X Measured Output Voltage TABLE 4-5 i___ s Truth table for Figure 4-5. Measured Output Voltage Input Output A X 0 0 1 1 Measured Output Voltage 35 TABLE 4-6 Truth table for Figure 4-6. -a Input Output A X y~ Measured Output Voltage TABLE 4-7 Truth table for Figure 4-7. Inputs 0 Output A B 0 0 0 1 1 0 1 1 1 X Measured Output Voltage & n .

It is used in both the on-site display and the remote display portions of that system. You will construct a simplified version of the display for this experiment. FIGURE 3-1 Procedure 1. Take a moment to review “Circuit Wiring” in the Introduction before constructing the circuit in this experiment. The pin numbers for the integrated circuits (ICs) in this and succeeding experiments are not shown; pin numbers may be found on the data sheets in Appendix A or on the manufacturer’s website. It is a good idea to write the pin numbers directly on the schematic before you begin wiring.