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Electronics Forum / Basics / September 2006schematic vs breadboard
Hi everyone, I am trying to build a simple A/D convertor from a schematic on my breadboard. Now, I've built something, but I'm not sure that it's wired correctly... The following link will show a picture of my breadboard and from the schematic: http://stunix.netfirms.com/AD/index.htm Note that the red wire is the ANALOG IN and the black wire connected to the scope is the PULSE output. Would anyone be able to tell me if there's something wrong with the wiring? Thanks! > Hi everyone, > [quoted text clipped - 14 lines] > > Thanks! Your chip is in backwards! Pin 1 should be the pin with the dot next to it. Also, your 0.1uF capacitor is shorted by the strip in the board. Haven't really checked for other problems, they were the two obvious things. Dave :) > > Would anyone be able to tell me if there's something wrong with the > > wiring? > > > > Thanks! > > Your chip is in backwards! Brilliant. It would have helped it he'd used a more conventional colour coding ! Typical googler. Graahm > > > Would anyone be able to tell me if there's something wrong with the > > > wiring? [quoted text clipped - 6 lines] > > It would have helped it he'd used a more conventional colour coding ! Having the "right" colour wires would have still produced the same result... > Typical googler. I'm offended! :-> The OP would not be the first beginner to get an IC in backwards. Heck, after 25 years I still do it occasionally when my brain isn't on the job! Not much fun unless it smokes though, but still an essential part of the beginner learning curve. You don't learn much when your circuit works first go! Dave :) > > > > Would anyone be able to tell me if there's something wrong with the > > > > wiring? [quoted text clipped - 9 lines] > Having the "right" colour wires would have still produced the same > result... It might have made the mistake more obvious though ! Graham Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to work now... The only problem is that I don't have an AC source to test it with (I thought of a mic, but I wouldn't know how to connect it to a breadboard...) Btw, I'm a student Electronics and Computer Engineering (in the second year), and we only worked with breadboards for about a month in the first year, and all the rest is FPGA's and microcontrollers, etc.. So that's the reason I'm not so good at wiring breadboards... Anyway, thanks a lot!!!! David L. Jones schreef: > > > > Would anyone be able to tell me if there's something wrong with the > > > > wiring? [quoted text clipped - 22 lines] > > Dave :) > Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to > work now... [quoted text clipped - 6 lines] > first year, and all the rest is FPGA's and microcontrollers, etc.. So > that's the reason I'm not so good at wiring breadboards... How do you make microcontrollers work then ? Graham and please stop top-posting btw. > > Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to > > work now... [quoted text clipped - 8 lines] > > How do you make microcontrollers work then ? Schools usually have "trainer" systems with everything (sadly) pre-connected. Just compile your code, download, and the LED flashes or the LCD lights up. Means everything works first go and the teacher doesn't have to waste time actually teaching anything :-> Dave :) A little off topic: Why not use top posting? Bottom posts require that I page through stuff I have likely already read. If the response is at the top, I only need to read that. If I don't recall the original it is there as a footnote. Do you have a reader that automatically sends you to the new material? I admit to following the herd on this subject! >and please stop top-posting btw. John Ferrell W8CCW >A little off topic: >Why not use top posting? >Bottom posts require that I page through stuff I have likely already >read. You might install those newgangled things on your screen, "scroll bars" I think they're called. The main reason to not top-post is because most everyone on usenet trims and bottom-posts, and think it rude if you don't. Consider it an issue of manners. John > The main reason to not top-post is because most everyone on usenet > trims and bottom-posts, It's been my experience that most people don't trim, yet still bottom post, which is very inconsiderate, since then you have to scroll (usually past lots of repeat and multi-quoted text) to get to the new text. Also, most people interleave, not bottom-post. If everyone learned to trim down to the minimum, and interleave post, I'd be happier. Usenet news servers used to enforce the rule that you had to have more new text than old, but that's long gone. Me, I trim heavily and interleave my replies most of the time, but top post when the text I'm quoting is more of a footnote than something I'm replying to. > It's been my experience that most people don't trim, yet still bottom > post, which is very inconsiderate, since then you have to scroll > (usually past lots of repeat and multi-quoted text) to get to the new > text. And tragic for the blind usenet users who have to listen through all of the other crap over and over and over again. If I have to scroll down as often as not I'll skip the message. >The main reason to not top-post is because most everyone on usenet >trims and bottom-posts, and think it rude if you don't. Consider it an >issue of manners. > >John I will try to remember to follow the tradition. John Ferrell W8CCW >>The main reason to not top-post is because most everyone on usenet >>trims and bottom-posts, and think it rude if you don't. Consider it an >>issue of manners. >> > I will try to remember to follow the tradition. Try to get into the habit of hitting "Control-END" when your reply window comes up. :-) And thanks for acknowledging the convention. :-) Cheers! Rich > Try to get into the habit of hitting "Control-END" when your reply > window comes up. :-) That's a long reach. > And thanks for acknowledging the convention. :-) > > Cheers! > Rich Puckdropper  SignatureWise is the man who attempts to answer his question before asking it. To email me directly, send a message to puckdropper (at) fastmail.fm John Larkin wrote: > >A little off topic: > >Why not use top posting? [quoted text clipped - 3 lines] > You might install those newgangled things on your screen, "scroll > bars" I think they're called. Now that I'm using Google Groups, it doesn't really matter if people top or bottom post, it automatically hides the quoted text, no need to scroll - nice. If your newsreader doesn't do this automatically then I suggest you get one that does, it's a great feature. I find myself rarely opening and reading the quoted text because I am already familiar with the thread. So I'd say that probably 90% of the time the quoted text is a waste of space for me. It's interesting to note that in other email lists like Yahoo Groups, top posting seems to be the norm. If you try and convince people to bottom post then they just end up throwing in ALL the quoted text and you have to scroll a heck of a long way just to get to the one new paragraph. It can be horribly inefficient. I've never really understood the issue either, if you are quoting a whole block of text then it *is* very inefficient to bottom post, and scrolling in this case is a PITA. Of course, if you are quoting paragraphs then you do it inline and then bottom post your final comment, that is of course very sensible. But now of course we have a bigger problem, Google Grouper snobbery, which is even worse! To the point where some people are kill-filing every person who uses Google groups, how ridiculously stupid. There are some very good reasons to use Google Groups for some people, and some "old timers" like myself have switched over to it. Dave :) > But now of course we have a bigger problem, Google Grouper snobbery, > which is even worse! To the point where some people are kill-filing > every person who uses Google groups, how ridiculously stupid. There are > some very good reasons to use Google Groups for some people, and some > "old timers" like myself have switched over to it. Yes. My News Server doesn't carry comp.sys.tandy which is a group I read and post to. And since it's a subcontracted service I'm doubtful I can get that fixed. > But now of course we have a bigger problem, Google Grouper snobbery, > which is even worse! To the point where some people are kill-filing > every person who uses Google groups, how ridiculously stupid. There are > some very good reasons to use Google Groups for some people, and some > "old timers" like myself have switched over to it. Well, yes, but you apparently know your elbow from a hole in the ground. Like, you're using whole words and complete sentences, that make sense, and everything is spelled right. That's not Googlegroupie behaviour. What I usually do with them is ignore the obvious homework questions and the ones where they abbreviate everything ridiculously because they never bothered to learn to type. Cheers! Rich *snip* > never bothered to learn to type. > > Cheers! > Rich I type with both hands. Does that mean I stereotype? Puckdropper SignatureWise is the man who attempts to answer his question before asking it. To email me directly, send a message to puckdropper (at) fastmail.fm On Wed, 13 Sep 2006 08:48:39 -0700, John Larkin wrote: > On Wed, 13 Sep 2006 10:48:44 -0400, John Ferrell > [quoted text clipped - 5 lines] > You might install those newgangled things on your screen, "scroll > bars" I think they're called. Are there still people using mouses without a scroll wheel? One caveat with bottom-posting, of course, is intelligent snippage. When I see a post with a dozen levels of thread quoted and big piles of >>>>>>>>>>>>>>>'s, to where the reply is off the bottom of my screen, I just skip the post. >:-> Thanks, Rich *snip* > Are there still people using mouses without a scroll wheel? Yes, and I'm not giving my mouse up! > One caveat with bottom-posting, of course, is intelligent snippage. > When I see a post with a dozen levels of thread quoted and big piles > of >>>>>>>>>>>>>>>'s, to where the reply is off the bottom of my > screen, I just skip the post. >:-> Who cares if it's intelligent or not? At the very least cut off all the previous replies except the original post you're replying to. Don't reply to an reply through an original post. > Thanks, > Rich Puckdropper SignatureWise is the man who attempts to answer his question before asking it. To email me directly, send a message to puckdropper (at) fastmail.fm *snip* > Do you have a reader that automatically sends you to the new material? No, but close. Whem I'm reading posts with lots of quotes I can hit [shift]+[space] to jump down to the first bit of unquoted text. This works only when others use properly quoting newsreaders (where quotes are greater than signs at the start of the line.) I'm using Xnews as my newsreader. Puckdropper SignatureWise is the man who attempts to answer his question before asking it. To email me directly, send a message to puckdropper (at) fastmail.fm > A little off topic: > Why not use top posting? It disrupts the natural flow of the conversation. > Bottom posts require that I page through stuff I have likely already > read. That's what snipping is for. > If the response is at the top, I only need to read that. If I don't > recall the original it is there as a footnote. Well, interleaved posting is acceptable, if there are multiple points that you want to address. (like this post of mine.) Thanks, Rich >Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to >work now... [quoted text clipped - 6 lines] >first year, and all the rest is FPGA's and microcontrollers, etc.. So >that's the reason I'm not so good at wiring breadboards... I hate those plastic breadboard things. I prefer to solder parts live-bug style on an old hunk of copperclad. It's a lot easier to understand, and you can add "comments" with a marker pen and keep it for future reference. If you're serious about electronics, you should set up a personal mini-lab: scope, DVM, function generator, soldering iron, power supply, a small stock of parts. The things you hear in class tend to just whizz by and be forgotten, but if you actually make working circuits, the theory becomes real and sticks. "Electronics" education is less and less about electronics, mostly because all that computer and digital stuff is so cheap to teach. John > Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to > work now... > The only problem is that I don't have an AC source to test it with (I > thought of a mic, but I wouldn't know how to connect it to a > breadboard...) Stick your finger on the input. That'll couple a little 60 cycle AC in. > Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to > work now... > The only problem is that I don't have an AC source to test it with (I > thought of a mic, but I wouldn't know how to connect it to a > breadboard...) if you've got it working with a potentiometer on the input, you could try AC from a small low voltage transformer (use a voltage divider if the transformer puts out too many volts) if that looks good then yeah you could try a microphone (it'd probably need amplifying before the DAC) or the signal from the headphone socket of a cheap radio (no point in risking a good radio...) Bye. Jasen > Ok, thanks a lot Dave, I corrected these two mistakes, and it seems to > work now... > The only problem is that I don't have an AC source to test it with (I > thought of a mic, but I wouldn't know how to connect it to a > breadboard...) Nothing to it. Go to the local electronics place, and get a mic jack. Solder a couple pieces of #24 bare wire to the contacts, and poke them into the breadboard. And please try to learn to bottom-post; top-posting upsets the natural flow of the thread. Thanks! Rich > Btw, I'm a student Electronics and Computer Engineering (in the second > year), and we only worked with breadboards for about a month in the [quoted text clipped - 31 lines] >> >> Dave :) Thanks! What exactly do you mean by "shorted by the strip in the board"? David L. Jones schreef: > > Hi everyone, > > [quoted text clipped - 23 lines] > > Dave :) > Thanks! > > What exactly do you mean by "shorted by the strip in the board"? It means the 2 'holes' you have it plugged into are internally connected in the 'breadboard'. Maybe you think the connections run the other way ? They don't ( except for the power connections on the outer part ). Graham > Thanks! > > What exactly do you mean by "shorted by the strip in the board"? Exactly as Graham said, but a picture tells a thousand words: http://www.machineproject.com/classes/images/Breadboard.jpg http://www.iguanalabs.com/breadboard.htm Depending on the breadboard model, the horizontal power strips can be split in half and not run all the way along, a trap for young players. Dave :) >> Thanks! >> [quoted text clipped - 6 lines] > Depending on the breadboard model, the horizontal power strips can be > split in half and not run all the way along, a trap for young players. Heh! Got bit by that one myself, once. :-) I noticed on the one page, they sell jumper sets, color-coded by length - hell, Real Men use tinned solid wire and teflon tubing! ;-) Cheers! Rich >>> Thanks! >>> [quoted text clipped - 11 lines] >I noticed on the one page, they sell jumper sets, color-coded by length - >hell, Real Men use tinned solid wire and teflon tubing! ;-) --- _Real_ men wire-wrap. SignatureJohn Fields Professional Circuit Designer > _Real_ men wire-wrap. Real men don't need none of these stinkin' prototypin' methods. They simply build the project. Puckdropper SignatureWise is the man who attempts to answer his question before asking it. To email me directly, send a message to puckdropper (at) fastmail.fm > >> Thanks! > >> [quoted text clipped - 11 lines] > I noticed on the one page, they sell jumper sets, color-coded by length - > hell, Real Men use tinned solid wire and teflon tubing! ;-) You use insulation? Real men don't need insulation! Dvae :) >> Hi everyone, >> [quoted text clipped - 23 lines] > > Dave :) Looks to me that the ic is in right. pin 1 is lower left and 8 is top left and connected to positive. The .1 cap is in line with the pin1 instead of pin 5 where it should be, and is indeed shorted by the breadboard connector. > Looks to me that the ic is in right. pin 1 is lower left and 8 is top left > and connected to positive. The .1 cap is in line with the pin1 instead of > pin 5 where it should be, and is indeed shorted by the breadboard connector. Take another look, the IC is in back to front. Turn the chip around and all the pins become correct, including the cap on pin 5. Dave :) > Hi everyone, > [quoted text clipped - 12 lines] > Would anyone be able to tell me if there's something wrong with the > wiring? Surely you can do that yourself ? What are you expecting the circuit to DO ? Why do you think you have a problem ? Graham |
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