Circuit Troubleshooting: Finding Correct States of Diodes

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SUMMARY

This discussion centers on troubleshooting diode states in simple circuits involving DC sources, resistors, and diodes. The key takeaway is that multiple combinations can satisfy Kirchhoff's laws, which may lead to confusion during manual analysis. The diode equation is crucial for understanding diode behavior, specifically that diodes conduct only when the anode is at a higher potential than the cathode, provided the reverse voltage does not exceed breakdown limits. The provided resources enhance comprehension of diode functionality.

PREREQUISITES
  • Understanding of Kirchhoff's laws
  • Familiarity with diode operation and characteristics
  • Basic knowledge of circuit analysis techniques
  • Proficiency in using the ideal diode equation
NEXT STEPS
  • Study the ideal diode equation in detail
  • Explore advanced circuit analysis techniques using simulation software
  • Research the effects of reverse voltage on diode performance
  • Learn about different types of diodes and their applications in circuits
USEFUL FOR

Electrical engineering students, hobbyists working on circuit design, and professionals troubleshooting diode circuits will benefit from this discussion.

seang
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Today in class we learned about diodes. Our prof explained to us that the only manual way to find the correct states of the diodes is guess and check. Each time, we ended with one correct circuit; that is Kirchoff's laws coincided with the diode constraints.

Now I'm doing this circuit on my own, and I'm finding that there are 2 combinations which fulfill Kirchoff's laws. Is this possible? or must I be making a mistake somewhere?

The circuit is simple really. DC sources resistors and diodes.
 
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As long as you don't put so large a reverse voltage across the diode to break it down, it will only conduct in the forward direction, when current flows from anode to cathode. It's best to think of diodes in terms of the diode equation:

http://en.wikipedia.org/wiki/Ideal_diode_equation
 
Take a look at the http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Diodes/Diode1.html" and see if it helps answer your question.

Regards
 
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