Hello, I have the following situation. Its probably all very simple, but I want to be sure I understand this correctly. http://i67.photobucket.com/albums/h304/john_ukranian/circuit2.jpg First of all you must know a little about my background. I know what electricity is, how it works, how a battery works and etc very well. I know many basic things very well. But I am very bad at reading circuit diagrams. In fact I was given this on my first day of Digital Logic course, when I only had ONE day of Linear Circuits and Systems an hour before. You see nobody taught me how to read circuit diagrams, and yet they expect me to know how to do so in another course which goes together with the one that will teach me how to read circuit diagrams. Its all quite absurd in my opinion. So as I read the input binary string, the only resistors which should be on are 4.7, 2.2, and 1.0 Kohms. All the other ones are connected to ground and have a current which is so low, its insignificant in this situation. Now comes the part I don't understand. Are these 3 resistors in series or parallel? How do I know? According to what I think, they are in parallel, because it looks to me like the original circuit with the resistors 6.8, 3.3, and 1.5 Kohms switched off. Here is what I drew. http://i67.photobucket.com/albums/h304/john_ukranian/circuit3.jpg Now of course if I am to determine V-out I need to know whether to combine the resistors in series or in parallel, and to be honest I have no idea. Please help.