This board is designed to work with the MFOS 16 Step Sequencer and supports both another set of "active step" LED indicators and another set Please read over the entire project before ordering PC boards Please do not attempt this project unless you thoroughly understand the operation andĬan troubleshoot it (as with any complex project, you will probably need to). Only the schematic, circuitĭescription, and suggested panel layout are provided. This is provided by the instructor.This is a very challenging project requiring understanding of electronics and electronic building and trouble shooting skills and equipment.Īccess to a good oscilloscope, DVM, bench power supply, soldering station and hand tools will be required. No report is otherwise required for the in-lab activity.ĥ0% At-home exercise on decoder logic design. This lab is grading for completion only, based on demonstration to the TA. Test input values 0-9, as well as 10-15.ĥ0% Completion of In-Lab activity (verified physical circuit demonstration). Demonstrate the operation circuit to the TA.Connect the CC (pin 8) of the seven-segment display to ground. Connect MC14485 outputs a-g to appropriate inputs a-g of the seven-segment display.Without disrupting the previous circuits, connect the four DIP switch signals to the four inputs A,B,C,D of the MC14485 IC.? TA Verification Have the TA check and record your completion. Demonstrate the operation of the circuit to the TA.Use ten output indicator circuits (resistor and LED) to observe the ten active low-outputs.Connect the four DIP switch signals to the four inputs A,B,C,D of the 74LS42 BCD decoder. You should otherwise use time before lab to plan your placement and wiring, and/or you may start assembly of your circuit before lab. the function of the decoder) for the at-home exercise. Once you complete the lab activity, the exerience may serve as a reference for understanding the logic design goal (i.e. Therefore there is no pre-lab submission. That exercise will be turned in as part a lab report, and does not nessisarily need to be completed before lab. Seven-Segment Decoder Truth Table (assuming LE=LOW) Seven-Segment Display Prelabįor this lab, the instructor is providing a complementary exercise related to the design of the logic for one of the decoders. Note the in-built current-limiting resistors. This is the circuit that will be constructed in this lab. This IC is an example of an integrated circuit with more than digital logic Therefore, you do not have to add current-limiting LEDs to your breadboard. The MC14495P1 has these resistors built-in because it is designed to drive such LEDs. The seven-segment display uses LEDs that you might expect to require the inclusion of current-limiting resistors in a driver circuit. Seven-Segment DisplayĬurrent-Limiting Reistors for seven-segment display LEDs This configuration is called common-cathode. This display has many LEDs with their cathodes tied together with the intent of a common connection to a low supply terminal. Additionally, this display has a right display point. It has seven primary segments which can be independently activated to display characters. Second Circuit Seven-Segment LED outputįor the second circuit, a Seven-Segment LED Display will be used. 3 ‾ \overline 3 ) on the pin labels in the datasheet to indicate this. Output Display First Circuit 10 LED outputįor the first circuit, 10 discrete LEDs and 10 current-limiting resistors can be used. In this lab the standard Quad DIP switch with pull-up resistors will be used for inputs. Resisors for current limiting LED current.learning the operation of a seven-segment LED display.verifying the operation of a hexadecimal to seven-segment decoder (MC14495).verifying the operation of a BCD-to-decimal decoder (74LS42).
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