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Electronic Labs_61

Electronic Labs_61 - 1-2 Digital Logic Trainer...

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Unformatted text preview: 1-2 Digital Logic Trainer Familiarization E DIFIIEHUGTC TMIliIF It ll'.i'.J'l NAP-Ll l'f)‘ l' ‘ Fig. 1-2 Objective A. Demonstrate how to set up the Model A818145 Digital Logic Trainer. Preparatory Information The Model A818145 Digital Logic Trainer contains twelve separate sections which are independently wired circuits. See Fig. 1-2. These sections can be connected together to build more complex digital circuits. All twelve sections are mounted on a convenient work surface and can be interconnected using wires to jumper one digital circuit to another. The Digital Logic Trainer requires a fixed +5Vdc supply to energize the digital logic circuits. The Model 1234 Enclosure/Power Supply provides the voltage necessary and provides storage for the Digital Logic Trainer when it is not in use. The supply voltage is plugged directly into the banana jacks provided on the Trainer’s work surface. Its lightweight design and clearly marked silk- screened work surface make the Model A818145 Digital Logic Trainer ideal for teaching digital logic circuit principles. Lab—Volt’s 5 volt power supply (ASl7814) can also be used to energize the Digital Logic Trainer. Exercise Procedure [:1 1.a) Secure the metal brace on the back of the Digital Logic Trainer. [3 b) Set up a power supply for exactly +5Vdc. Connect the positive lead of the power supply to the red (+) jack and the negative lead of the power supply to the black (—) jack. D 0) Turn off the power supply for now. Look at the Digital Logic Trainer. Notice there are a total of twelve separate logic circuits. C] d) When power is supplied to the trainer, all the circuits are operational and can be intercon- nected using the wire provided. The wire is inserted into the connectors at the inputs and outputs of each circuit. NOTE: Wire used for circuit interconnection is standard No. 24 single conductor wire. For best insertion method, hold the wire perpendicular to the board and push straight down into the center of the terminal. After the terminals have been used a few times insertion becomes easier. If the wire develops a kink, stretch it out by running it between your fingers. The wire may also be cut and restripped. Additionally, the material in the trainer terminals is a protective silicone substance. It will not interfere with electrical connection, should not be removed, and after initial connection will make interconnection easier. Objective B. Demonstrate the basic operation of The Display, Switch, Clock and Pulse cir‘cuits. Preparatory Information. The Display section provides eight Light Emitting Diode (LED) type indicators. The LEDs are illuminated by transistor current amplifiers which are all contained in one Integrated Circuit (IC) on the trainer. The schematic diagram for one of the indicator circuits is shown in Fig. 1-3 (a). When a HI logic level is present at the Display circuit input, the transistor is forward biased, conducting to saturatic n. In other words, it has a low resistance between emitter and collector and acts as a switch closing to complete the lamp circuit path. Fig. 1-3 (b) shows the equivalent Circuit, which now has the LED in series with the limiting resistor and switch connected to Vcc- The LED conducts indicating a HI logic level exists at the input. When the LED is unlit it indicates a LO exists at the input. INPUT LAMP )7 HI [1)“ LIT )7 5 L0 l0) UNLIT LED LED lNF UT ...
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