Eagle PCB Tip: Pin and Gateswapping
To optimize board routing, there are times that interchanging pins or gates is necessary. Recent article on Dangerous Prototypes gives us a full description and procedure to make this happen in EAGLE.
Eagle Tip: Gateswap and Pinswap tool - [Link]
Surprisingly often, I find myself wanting to import vector images into eagle, and have them appear as polygons – usually for silkscreen. Whilst importing vectors as lines is practical – although ridiculously awkward – up until now I haven’t found a single practical way to import a vector drawing as polygons.
Importing SVG images as polygons Into Eagle - [Link]
Ever want to print your own PCBs for high power LEDs, other SMT power devices, but regular PCBs can’t sink enough heat? Fear no more! You can print them right onto silicone thermal tape!
PCBs on thermal tape – Put them on heat sinks! - [Link]
Many users often request if there are any tools that can simplify library part creation. Make-symbol-device-package-bsdl.ulp is one of those tools, it can parse a BSDL file and automatically create a part for you, device, symbol, package everything in just a few clicks. It’s one of the more sophisticated ULPs that ship with EAGLE and can be used to speed up part creation especially with high-pin count components such as FPGA and large microcontrollers. Most manufacturers such as TI and Microchip provide BSDL files for their parts. This is also one of two ULPs that come with a manual you can find it in the doc folder of your EAGLE installation. [via]
Eagle Quick Tip: Simplify library part creation - [Link]
Our dear friend Vassilis notes an easy way to trim ground fills on EAGLE PCBs. This tip is really helpful if you would like to prevent ground to be filled on small areas without having to add a new polygon.
Normally, if we like to add a ground plane on a PCB we use a polygon named GND and then empty space is filled with copper attached to GND net (keepout distance from traces, pads etc can be adjusted). In most cases you will notice that copper is filled in areas that we would not like to be filled. A solution to this is to add a polygon on tRestrict layer to prevent copper to be added on that area. This solution works nice for relative large areas of board.
Another way to prevent ground to fill a small area is to use a wire on tRestrict layer placed in such a way to “cut” the ground filling path. Using such wires on the above PCB give us better results as you can see on the screen below.
Jianyi Liu wrote a tutorial on PCB fabrication at home. He states: [via]
A few years ago, I started experimenting with homemade prototype PCBs as an alternative to professionally fabricated PCBs from board manufacturing company. My company was flexible enough to give me some resources and time to explore the subject matter. What I discovered was that with a small initial investment, you can make reasonably high quality two sided boards. In addition, all the equipment needed was easily accessible. I’ve decided to put my findings into this guide. Hopefully some of my fellow hobbyists will find the information useful
DIY PCB tutorial - [Link]
Here is a great list of some Eagle tips on dangerousprototypes.com. Check it out..
Cadsoft Eagle tips and tricks - [Link]
I decided to order a prototype PCB for my latest project in a professional fabrication company but i could’ t decide if i should order it in a company in Europe or Asia. I am located in Europe and I wanted fast and quality service so it seemed that ordering from Europe will be the best choice. But i also was curious about the quality of the cheaper Asia manufacturers. So i concluded ordering the same PCB on both an Europian and an Asian PCB manufacturer. I choose the following PCB manufactures :
Eurocircuits.com – offers a great user experience when ordering a PCB. You place your PCB in shopping basket, you choose PCB details and you get an instant quote for your order (including shipping, excluding VAT). After placing your PCB in shopping cart you are able to review you PCB in PCB Visualizer. PCB Visualizer is a great tool to test you PCB for manufacturability online. My PCB prototype (2 layers, 1.55mm FR4, 1oz copper, green soldermask, white silkscreen, Lead free HASL, 100% E-test, .. more details here) costs calculated at 85 EUR for 2 pieces including UPS shipping.
Iteadstudio.com - offers a pretty simple billing scheme, you choose from 5 sub-categories based on your max PCB dimensions. Quantity offered for each category is 5-10 pieces and prices are reasonable. I choose the 10x10cm batch offering 10 pieces (2 layers, 1.6mm FR4, 1oz copper, green soldermask, white silkscreen, Lead free HASL, 100% E-test, .. more details here) for a price of 24.90 USD + 25 DHL shipping = 49.90 USD final value.
Order on both manufactures done the same day. Both PCBs come to our door in 10 days. What we got:
- Eurocircuits – we received 3 PCBs in 10 days for 85 EUR. PCB quality is great, plating is more thick on bottom than top layer, pcb cut-offs from panel are visible, soldermask has a faded green color, there are marks from E-testing. Packaged on plastic bag (vacuum). Cost per PCB = 28,3 EUR
- Iteadstudio – we received 10 PCBs in 10 days for 49.90 USD. PCB quality is great, plating is more thick on bottom than top layer, pcb cut-offs from panel aren’t visible, soldermask is shiny vivid green color, there are marks of E-testing. Packaged on plastic bag (vacuum) + silica gel. Cost per PCB = 4,99 USD
I can’ t figure out any significant quality details between the two PBCs. To me IteadStudio PCBs seems more beautiful and worth the money. So i give +1 to IteadStudio for quality, quantity and processing time!
A great online PCB verification service for free…
For added peace of mind now you can verify your PCB data prior to placing your order. PCB Visualizer is an automatic tool for data input and manufacturability analysis. Clear graphic presentation pinpoints any issues found. You can then fix them up front, helping to avoid delays to your time-critical deliveries. Upload your Extended Gerber (RS274X) or CadSoft EAGLE V6 files and let us surprise you.
pcbvisualizer.com – Free online PCB data verification service - [Link]