Search found 8 matches
- Sun Aug 10, 2003 10:34 am
- Forum: General Discussion
- Topic: resistor problem on uC
- Replies: 2
- Views: 1690
resistor problem on uC
I'm using a resistor pack to hold portb of my uC low but when I send one pin high the whole port is going high, it's a 20K RP, it worked just fine in the breadboard but now that it's in the PCB i'm getting problems.<p>Any ideas??<p>Ron
- Mon Jul 07, 2003 5:53 pm
- Forum: General Discussion
- Topic: Crystal won't start
- Replies: 2
- Views: 1843
Crystal won't start
I'm having a problem with a circuit I've made, it worked fine on the breadboard and now that it has moved to a PCB the crystal won't start I just get 5V and no Oscillation, now I know it's hard to guess at the problem without seeing the PCB but I traced it out and it is fine, I even removed the Caps...
- Thu Mar 13, 2003 3:24 pm
- Forum: General Discussion
- Topic: Creating Custom printed PC Boards
- Replies: 20
- Views: 9624
Re: Creating Custom printed PC Boards
Here is how I make mine (I use a laser printer but you can do this with an injet as well just different transparencies) make your PCB on the computer, print it on the transparency, using photosensitive copper clad board you place the transparency on top of the board (in very low light and ink side d...
- Wed Mar 12, 2003 8:38 pm
- Forum: General Discussion
- Topic: Double sided PCB's
- Replies: 5
- Views: 2655
Re: Double sided PCB's
Hmm that sound easy, won't there be a bit of distortion due to the thickness though? I should give that one a try though on a small test board to see how well it works!<p>Thanks
Ron
Ron
- Tue Mar 11, 2003 2:33 pm
- Forum: General Discussion
- Topic: Double sided PCB's
- Replies: 5
- Views: 2655
Double sided PCB's
I've been making single sided PCB's for a while now using pre sensitized board, now I have a much more complicated board to create and I think I need to use double sided board, I just like to get some tips from those of you that have done this and can pass along a few hints as far a lining up the tw...
- Thu Feb 13, 2003 3:05 pm
- Forum: General Discussion
- Topic: Creating a high impedence probe
- Replies: 6
- Views: 3641
Re: Creating a high impedence probe
Thanks for all of your help<p>I used a 74LS244 and it's working like a charm, the probram that I', using was written in ASM and is fairly fast, I'm not too concerened about realtime being in windows I never expected that, I just wanted to see the relationship between the lines. I'm running a P3/733 ...
- Wed Feb 12, 2003 8:25 pm
- Forum: General Discussion
- Topic: Creating a high impedence probe
- Replies: 6
- Views: 3641
Re: Creating a high impedence probe
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Russ Kincaid: Since you are using the parallel port, you must be looking at logic signals. The solution is to use CMOS logic buffer such as 74AC244 or 74HC244. <hr></blockquote>...
- Wed Feb 12, 2003 3:51 pm
- Forum: General Discussion
- Topic: Creating a high impedence probe
- Replies: 6
- Views: 3641
Creating a high impedence probe
Hello, I'm trying to make a logic analyzer using my parallel port but I don't want to load down the target circuit, what would be the best way to do this?
My first thought would be to use a MOSFET since they have a high input resistance.<p>Any ideas?<p>RonH
My first thought would be to use a MOSFET since they have a high input resistance.<p>Any ideas?<p>RonH