This article goes through the process of building your own i/o expander breakout board for the DE0-Nano Altera FPGA demo board. The PCB built easily connects to a breadboard where you have access to each individual FPGA I/O pin.
DIY DE0-Nano Breakout Board - [Link]
Florin made a head to head comparison of Seeed and ITead’s inexpensive PCB services. He made the orders with the same design files, on the same day. While the Seeed order came in after 4 weeks, ITead’s came just 15 days after the order was made. The author however suspects it might have been a fluke, since all his earlier orders from ITead took around 4 weeks to complete too.
Seeed Studio vs ITead Studio PCB service head to head - [Link]
PCB design toolkit – PCB Via Current | PCB Trace Width | Differential Pair Calculator | PCB Impedance – [via]
The Saturn PCB Toolkit is the best resource for PCB related calculations you can find. It incorporates many features that PCB designers and engineers are in regular need of like current capacity of a PCB trace, via current, differential pairs and much more. Please download our PCB Toolkit today for free and enjoy!
PCB design toolkit – PCB Via Current | PCB Trace Width | Differential Pair Calculator | PCB Impedance - [Link]
Ian @ dangerousprototypes.com
In Eagle polygons are used to make big copper areas on a PCB that aren’t necessarily traces. We use them all the time to fill blank space on a PCB with copper connected to ground. Less frequently we use them to make large power traces such as with the ATX Breakout Board. Here’s some notes on how to use and customize polygons in Cadsoft Eagle.
Polygons and ground fills for PCBs in Eagle - [Link]
There are many CAD developed to assist the electronic designers during drawing of PCBs and schematics; often they are integrated in complete suite to project, simulate and realize a whole electronic system. Besides the many commercial versions, there are also free CADs available. Today we’d like to analyze one of the most diffused and known software: Eaglecad (eagle does not mean the powerful bird but it is the acronym of Easily Applicable Graphical Layout Editor) made by Cadsoft, actually at version 6.2.0. We have chosen this one because, as you know as an Arduino’s fan, the official pcbs and schematic files of the boards are developed and available free of charge to everybody in Eaglecad format; you can find also a lot of libraries and circuits made by famous DIY website (Sparkfun for first) available for free.
How to make an Arduino shield with Eagle CAD - [Link]
Haris Andrianakis writes:
After some modifications on my UV exposure box (scanner) for better UV expose, i desided that a better pcb must me designed for switch timer. The old one had over drilled holes and it was designed and built on my very fist steps. Also the high voltage side from the low voltage wasn’t seperated as it needed to be safe.
So i redesigned it in a more compact and easier to use pcb. The firmware has been also updated and now you can program the timmer by using the two buttons. The time is calculated by timer interrupt triggering using a 32.768KHz RTC Crystal with better accuracy. The display update also has been changed from static to dynamic.
PCB Exposure Switch Timer V2.0 - [Link]
Rik shows how to design PCBs with more than two layers in Cadsoft Eagle. The tutorial covers the basics, as well as some advanced subjects like BGA escape routing. Keep in mind you’ll need a standard or pro version of Eagle, as the free version doesn’t support designs with more then 2 layers. [via]
Designing multilayer PCBs in Cadsoft Eagle - [Link]
ZofzPCB is a gerber viewer geared to make verification quick and easy. It shows the board and layers in 3D so it’s easier to spot errors. It can also make each trace a different color so the location is clearer. [via]
- ZofzPCB 3D Gerber Viewer can display 3D PCB model, using your design CAM files.
- Gerber and Excellon files are assigned to layers in auto or manual mode. – Stackup dimensions are fully editable.
3D approach allows more direct visual examination of your design.
- ZofzPCB 3D Gerber Viewer aided by DirectX and modern graphic hardware, brings impressive real-time images to your desk.
- ZofzPCB recreates netlist and can mark each net with different color.
- ZofzPCB allows you to take mechanical measurements, also between layers.
ZofzPCB 3D gerber viewer - [Link]
Schurter 5500.0655.1 line filter will enable it to you and provides an universal usage, independent on the type of the of the inlet power socket used in your device.
It is necessary to use an input line filter in almost every device. At its choosing, you have a possibility to use a filter combined with an input line socket , or a standalone, most often designed for PCB mounting.
Thanks to a big amount of various electric devices with a non-linear power consumption, the line voltage sinusoid is far distant from a clean form found in books of mathematics. Despite still more stringent EMI and EMC regulations, it is necessary to use line filters – also thanks to the fact, that modern digital circuits with a very low power consumption are potentially more sensitive for disturbances. A similar situation is at analog circuits, where more sensitive circuits are used (amplifiers, AD and DA converters, …). A usage of a filter brings two benefits – a better protection of a device from disturbances and also prevents a noise leakage from your device to a mains line.
A novelty in our portfolio is the Schurter 5500.0655.1. line filter for PCB mounting. Advantage of the PCB version is, that it doesn´t require a space on your device´s rear panel. With a maximum current of 6A, it is suitable even for relatively powerful devices. In the Schurter 5500.0xxx datasheet can be found detailed graphs about the filter attenuation in a common, as well as differential mode. For highest demands regarding EMC, it is possible to equip the filter with a metal shield.
Afford to your devices an undisturbed operation - [Link]
As consumer devices continue to shrink in size, power considerations and appropriate thermal design become increasingly important for circuit designers and board layout engineers. This tutorial helps designers to ensure that a board is both electrically sound and thermally balanced for proper operation and optimum efficiency.
Layout Considerations for High-Power Circuits - [Link]