I've got that as well!!! There is quite a few JD barbeque sauces.. (WOW Another spelling the Americans don't like!!!)hi Ian,
You said in another your eyesight was not so good, perhaps its 'spec savers' time.
E
Or change over to this....
Panel PC.. Vortex86 with everything!!!What kind of back light inverters that cost £400?
I used to buy mine from DigiKey here in the past, around $20. - $30 if I recall?
Max.
First rev boards virtually always have problems, I wouldn't beat yourself up about it. In fact these days, I treat the first rev PCB as a complete prototype, I generally rush it out as soon as I can, and treat it like its going to have problems once I get it. I put on multiple zero ohm links to isolate different parts of the circuit, I sometimes add a few different designs of circuit subsections which I can then test their characteristics individually by populating the appropriate zero ohm resistors. This is particularly handy with SMPS design. So often you chose a controller from pure theoretical and cost parameters, then just have to make it work. If you've got a few SMPS designs on your current board, you can see the characteristics and chose what works best.Last week really didn't go very well for me either. I designed a board for a piece of test equipment we use in-house. Discussed it with the engineers and technicians who used it the most, the software engineers that program the FPGA and the GUI, the managers in charge, etc. Had some of my coworkers in my own department look over the design and verify that everything was ok, and that there were no errors. I was confident that it was ready to go, so I wrote up a purchase req and had my managers sign off on it, and got the PCBs made (10 of them cost about $1500). Got them back a couple of days later and we assembled them in the lab. I took one to the printhead test lab (where they will be used) and hooked it up to the equipment. Plugged in the USB, and the computer mouse died. After some examination I realized there was a dead short on the USB port. I decided to use an external supply so that I could at least complete the testing. Other than the USB issue, there were no problems. I went back to look at the design and eventually discovered that the footprint I had used for the USB connector was mirrored, probably due to a poorly labeled "bottom view" rather than the standard "top view" shown in datasheets. The entire batch ($1500 worth) had to be scrapped.
I have been on a long-running project at work for another piece of in-house test equipment. There have been a lot of changes to the design in the process, so my coworker (who is on the project with me) and I have had to adapt frequently based on management's ideas of what the final product should look like. As soon as we think we have a final design, management decides to do it a different way, one which requires a complete redesign of the system. The other day I learned that management complained to my coworker saying "You seem to be having trouble meeting deadlines." Of course we're having trouble meeting deadlines, when management keeps changing their design requirements
It's been a very tough week, and there have been a few other projects that have kept coming back to bite me. I still enjoy my job and the people I work with are great, but it's definitely been challenging.
Matt
Ah, dont get me wrong, but I love hearing that other people also make mistakes in their jobs. Makes me feel more human
First rev boards virtually always have problems, I wouldn't beat yourself up about it. In fact these days, I treat the first rev PCB as a complete prototype, I generally rush it out as soon as I can, and treat it like its going to have problems once I get it. I put on multiple zero ohm links to isolate different parts of the circuit, I sometimes add a few different designs of circuit subsections which I can then test their characteristics individually by populating the appropriate zero ohm resistors. This is particularly handy with SMPS design. So often you chose a controller from pure theoretical and cost parameters, then just have to make it work. If you've got a few SMPS designs on your current board, you can see the characteristics and chose what works best.
First thing to do is hook it up to a current limited bench supply, limit the current to a very low value and turn it on to pick up any shorts. Afterwards, when you get around to your Rev1 board, you'll have your Rev0 board to base it off, it will contain all the final values and have a much better chance of being 100% accurate.
I mean, boards are getting so much more complex these days, gone are the days of breadboard design. Everything is SMD. Think of a small board with 200 components, and possibly over 1000 connections. Even if its 99.9% correct, you still have one fault.
You mean you cannot just replace the Inverter?Panel PC.. Vortex86 with everything!!!
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