- #DECIMAL TO BCD PRIORITY ENCODER TRUTH TABLE HOW TO#
- #DECIMAL TO BCD PRIORITY ENCODER TRUTH TABLE CODE#
For successful circuit-building exercises, follow these steps:ĭraw the schematic diagram for the digital circuit to be analyzed.Ģ. You will learn much more by actually building and analyzing real circuits, letting your test equipment provide the änswers" instead of a book or another person. While this is good, there is a much better way. Typically, students practice by working through lots of sample problems and checking their answers against those provided by the textbook or the instructor. Learning to analyze digital circuits requires much study and practice. Questions such as this should be followed (eventually) by other questions asking students to identify likely faults based on measurements. Although this is not necessarily a realistic perspective, it helps students build the foundational knowledge necessary to diagnose a faulted circuit from empirical data. The purpose of this question is to approach the domain of circuit troubleshooting from a perspective of knowing what the fault is, rather than only knowing what the symptoms are. � Solder bridge (short) across resistor R 14: There will be no distinctive "13" state ( 1101), the analog values for all the other states adjusting slightly to fill the gap. � Comparator U 13 output fails low: Output will assume the "13" state ( 1101) unless V in exceeds that analog value, then the ADC will register properly. � Resistor R 1 fails open: If V in V ref, output will be 15 ( 1111).
#DECIMAL TO BCD PRIORITY ENCODER TRUTH TABLE CODE#
Resistor R 16 fails open: Output code will be 15 ( 1111) all the time. Which condition would be easier to troubleshoot?ĭiscuss alternative solutions with your students, being sure to first define what the problem is so that all understand. Ask your students whether the output of this encoder circuit will always be incorrect if two inputs are simultaneously activated, or if only particular combinations of active inputs cause problems. Often, a company designs, builds, and markets a product, and the customers experience trouble because their applications are improper for that product, or the application reveals a deficiency in the product that wasn't detected during development.Īs elegant as the "diode network" design of encoder is, it certainly has its limitations. I'll answer this question with another question: what if two failures occur on this machine at the same time?ĭespite the overly simplistic nature of the company's product, this scenario accurately reflects the realistic nature of product development and customer application. Then, recommend a solution for your customer. To the best of your ability, determine why your company's flagship encoder circuit sometimes produces false codes in this application. They would have rather used a separate LED for each "trouble" sensor, but the display panel was too small to accommodate fifteen LEDs, so they decided to use four LEDs and an encoder, having their technicians interpret a binary code to determine which of the fifteen sensors is activating. Each input of the encoder is connected to a different sensor on the machine (low oil pressure switch, high temperature switch, out-of-limit travel switches, etc.), and then the encoder outputs drive a four-LED display for maintenance technicians to view. He tells you it is used as part of a fault diagnostic circuit for an important piece of machinery.
You then telephone the customer and ask him how he is using the encoder. Perhaps the problem is in how the customer is using it. After sending it back to your workshop for warranty repair, you determine there is nothing wrong with the encoder circuit itself: it always outputs the correct codes when you energize the appropriate inputs.
However, your first customer has a complaint with your encoder circuit. " Our encoder circuits are more reliable because there � s less to break."Īfter months of hard work, you unveil your latest masterpiece, the 16-line to 4-line encoder: After agreeing on a policy of truth in advertising, your board of directors drafts this slogan:
#DECIMAL TO BCD PRIORITY ENCODER TRUTH TABLE HOW TO#
Having learned how to build simple encoder circuits using diode networks, you set out to form your own encoder manufacturing company: Encoders, Inc.
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