T&L Publications

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

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...

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...

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

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...

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 ...

<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>...

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