Basically pin1 is always the cathode on diodes. It's up to you to check the footprint matches reality. It's a common problem with all circuit layout packages. Quote from: salbayeng on March 03, 2015, 08:37:07 am I don't use diptrace, but I'm pretty good with Protel. So I always just start doing the layout, throwing in components as I go. But I love drawing, the actual art/science part, because every line matters.
#Diptrace libraries software
(I still use CIRCAD 98 as my CAD, even with its severe limitations, but I really like the simple no-bullshit flow it's more like a drawing program with some PCB CAD features.) I totally hate playing with broken/poor software (and "management" side of things), because they alienate you from what's really important, which, in case of designing a PCB, is, well duh, designing the PCB. I still mostly use this workflow, but I might be a bit crazy. This will keep you focused on trying to understand what your PCB is going to do (and avoid the mindset that you are just mechanically solving a puzzle of mapping the schematic on PCB). Draw the schematic by hand, and start laying the board from scratch. No way! For a beginner, I could even recommend the exact opposite don't use the strict schematic-netlist workflow at all. Many beginners seem to make the mistake of thinking that autorouters are handy for them. Even something as simple as trace widths to carry the required current. Physical properties such as: capacitive coupling of signals, stray inductances of power and ground, bypass capacitor locations, etc.
#Diptrace libraries how to
You need to think about the physical (electrical) properties when doing it, so it's not only a logical puzzle how to do it in smallest size and least vias/layers/jumper wires/whatever. Circuit layout is a super important circuit "component" itself! It's not just there to connect the components it has parasitic elements that seldom are negligible. Learn it! I really enjoy it, but there is some learning curve involved, but you'll never get there without actually doing it by hand. Sorry, no luck there, you just don't draw a schematic and give it to an autorouter like that.
#Diptrace libraries professional
They are for professional use, for those who know what they are doing, in some limited situations. You are indeed super wrong about autorouters. And when powering up a circuit, wind the voltage to no more than 5v, or stop when it gets to 20mA, then run around with a meter, checking what you thought was positive is actually positive. Watch for SCR's they usually have the gate at the opposite end to a bipolar or MOSFET. The 78L05 in a TO-92 can be numbered 123 or 321.
When you read a data sheet double check the numbering used by looking at the picture. I got caught out so often with diodes that I made my own symbols and named the pins K and A. With a Dtype connector pin 1 swaps from left to right for male and female. Just wait till you get to connectors, pin 1 can be on left or right depending on manufacturer. Pin 1 when looking at a component package on the screen is always on the left (or top), pin 1 when loading from a piece of cut tape is nearest the sprocket hole, i.e. With SMD parts for example, the SMA diode package and the Tantalum size A are near enough interchangeable, except pin 1&2 swaps over. Else pin 1 is the end with the mark, which oddly enough is positive on tantalums and other polarised capacitors. I don't use diptrace, but I'm pretty good with Protel.
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