Bad Circuits -- Test Your Knowledge We were having a discussion in a different thread about the fun sections at the end of each chapter in "The Art of Electronics" by Horowitz and Hill, where they show simple schematics as examples of Bad Circuits, without any explanation of what is bad or wrong about them. It was mentioned in that thread that sometimes it can be hard for students learning about circuits to determine what exactly is "bad" about the circuits shown, so this thread is meant to provide a place where we can discuss those circuits, and also to post other problematic circuits that folks have run across in their work or studies. So if one of H&H's "Bad Circuits" is bothering you, or if you have run across any examples of errors in schematics that others can learn by, please post them here for others to see and discuss. I'd like to keep this thread as tutorial as possible, so here are a couple requests: -1- Please do not post homework problems in this thread. You all know where homework questions should be posted for tutorial help. -2- If you can see the problem with a circuit easily, please hang back for a bit to let others discuss it, and maybe offer a small clue or two. Students will learn better if there is a discussion about the circuit, rather than hearing the answer early and outright. That's it for now. I'll pull out my H&H copy and post something on Monday, unless somebody beats me to it. EDIT -- BTW, we are posting small parts of Horowitz and Hill's textbook under the Fair Use portions of copyright law. They are being used for educational purposes only. Many of us here are fans of this book because of its practical approach to basic electronics, and use of real-world components throughout the course of the book. I encourage you to take a look at the book at your local technical library, or at your bookstore. It is now in it's 2nd edition: http://www.amazon.com/Art-Electroni...5879301?ie=UTF8&s=books&qid=1185840378&sr=8-1 .