joebell @ instructables.com writes:
With a little practice, you can make excellent double-sided PCBs by combining a laser cutter with chemical etching. The basic idea is: the laser cutter blasts away spray painted etch resist, then chemicals eat away the exposed copper. Once the copper is gone, the underlying board can be cut again with the laser to make through-holes. No drilling required! After some setup and practice, you should get reliable boards with 8-mil trace/space and hundreds of holes in about 2 hours. You can even cut internal routing and odd board-shapes!
Double-sided PCBs with a laser cutter – [Link]
Connectors of the PV, SV and SH series are available in a huge amount of versions and sizes, that´s why you´ll certainly find here a suitable type for you.
A very frequent requirement for a simple and reliable connection of wires to a PCB is actual about as long as the world knows plated copper boards. There are many solutions and producers, thus a choice of suitable type is usually a question of your preferences, requirements of a device, availability, offer of distributors,….
Even in our store can be found various solutions from world-class producers like TE Connectivity (Tyco, AMP), Wago, Phoenix Contact and also from company Euroclamp. Just the last one mentioned – Euroclamp, focuses mainly on PCB terminals, what is reflected in a wide offer. From our experience we can confirm a quality and reliability of these connectors. To the most favorite ones belong series PV, SV and SH, what are plug-in connectors (terminal blocks) for PCB and the mating types for a cable. They´re available in pitches of 2.5mm/ 2.54mm/ 3.5mm/ 3.81mm/ 5.0 mm/ 5.08mm/ 7.5mm/ 7.62mm/ 10.0mm/ 10.16 mm. So as to make you a selection of a right type easier, we bring you a few hints and explanations regarding their description.
● PVxx – main type for a PCB (connector with pins).
Example: PV02 (02-24= number of poles) – 5.08 (pitch of pins) – V (V-vertical, H-horizontal)- M (M-modular, P-closed)
● SVxx – connectors (female) for a cable – intended for connection with the PVxx series
SV02 (02-24= number of poles) – 5.08 (pitch) – P (P – rear wire connection, F- frontal wire connection) – * (additional code, for example „K“= version with side screws)
● SHxx – right angle cable connectors (female) – intended for connection with the PVxx series)
A very useful “complement” of these series is also the SFxx , series, i.e. – a terminal block enabling a “wire to wire” connection (with types SVxx or SHxx). It can be very convenient if we for example want to jump some module and to maintain input and output leads interconnected (enable to make for example various versione of the same product. A novelty in the Euroclamp portfolio is also the PF series – for a PCB (female connector), enabling connection with PF – (male connectors).
A common feature of all PVxx connectors is a relatively high current handling ability – for example 12 (16)A/450VAC at types with 5.0 or 5.08mm pitch and a maximum wire cross section of 4/2.5 mm2 (solid / stranded wire). Body of connectors is made of a rigid self-extinguishing polyamide (UL94-V0) and the connector itself is made of nickel plated copper alloy. Basic color of these connectors is green (RAL6032) but upon order they´re also available in other colors (grey, black, blue, red, yellos, brown and other). A considerable advantage is also a wide range of operating temperatures of -40 to +130°C.
Types with a wide pitch (for example 10mm) are physically the same with types with a half pitch ( 5mm), they only differ in omitted pins and naturally the maximum allowed voltage is higher (750VAC). Perhaps the best idea about possibilities of these „plug-in“ connectors will give you attached pictures. Detailed description can be found in the Euroclamp short-form catalogue, in the main catalogue Euroclamp, as well as in datasheets at particular types.
Do you already have solved a connection to a PCB? – [Link]
EasyEDA is a Web-Based EDA, schematic capture, spice circuit simulation and PCB layout Online. [via]
EasyEDA launches a free, zero-install, Web and cloud-based EDA tool suite, integrating powerful schematic capture, mixed-mode circuit simulation and PCB layout in a seamless cross-platform browser environment, for electronic engineers, educators, students and hobbyists. EasyEDA has extensive built-in schematic, spice and PCB libraries which can be easily extended using powerful symbol, model and footprint creation and editing tools.EasyEDA has integrated with DangerousPrototypes’ open source libraries, so the makers can build electronic stuff with DangerousPrototypes parts in EasyEDA easily.
EasyEDA – Web based design tool – [Link]
Dave shows how the assemblers will production test the µCurrent PCB panels using his new test jigs. And he will does a trial run on 50 µCurrent PCB’s to determine the average testing time. What will take the longest – PCB testing, or wrapping, or packaging?
EEVblog #588 – How To Do PCB Production Testing – [Link]
A while ago I needed some small value resistors as current shunts and I started wondering about the feasibility of using traces as resistors.
There are many theoretical reasons as to why copper traces make bad shunt resistors, but I found surprisingly little practical data.
The traces are (from left to right):
– 20 mil wide, 1221 mil long, should be ~30mOhms
– 6 mil wide, 611 mil long, ~50mOhms
– 12 mil wide 1221 mil long, 50 mOhms
– 6 mil wide 1221 mil long, 100 mOhms
Using traces as resistors – [Link]
Gerbv is an open source Gerber file (RS-274X only) which runs under Windows or Linux.
Gerbv lets you load several files on top of each other, do measurements on the displayed image, etc. Besides viewing Gerbers, you may also view Excellon drill files as well as pick-place file
gerbv – a free Gerber (RS-274X) viewer – [Link]
pinomelean @ instructables.com writes:
There are many ways to make your own homemade PCB’s, They all work, but some better than other, some faster than other, ones are cheap and others expensive….
After several attempts, i found the way of making PCB’s, wich is the cheapest, easiest and fastest for me.
I hope this instructable will help you to decide what’s the best method for you, because there are so many to choose.
PCB making guide – [Link]
Custom Circuit Boards, LLC. is a quick turnaround PCB prototype manufacturing company located in Phoenix, Arizona with 32 years of experience on the field offering the best quality printed circuit boards from PCB prototypes to production PCBs. They also have the capabilities to provide multilayer PCBs up to 24 layers. As a leading PCB manufacturer, they provide their services to the aerospace and military industry, medical and bio-medical, automotive industry, and even to hobbyists and student’s with only one thing in mind, quality assurance.
“We started Custom Circuit Boards because we were tired of the poor customer service and board quality from other PCB companies in the industry. We knew that we could do better. Now, every day we do ourbest to exceed our customer’s expectations by providing exceptional personal customer service and competitively priced high-quality printed circuit boards that are delivered on time.”
Custom Circuit Boards fabricates all of their PCBs in their USA factory and they are continually investing in better machinery and technology in order to improve their PCB capabilities. The standard prototype PCB lead-time is 10 days, however, depending on the complexity of the boards and quantity, it could be shorter. They also provide 24 hour, 2 day, 3 day, 5 day and 10-day turnaround when needed. Read the rest of this entry »
Diyouware build a low-cost PCB printer for photoresist using a blue ray module. The UV laser scan the PCB surface and sensitize the UV resistive dry film.
About a year ago my brother and I engaged on a quixotic project to build from scratch a low-cost PCB printer for photoresist.
Finally we did it using a Blue Ray optical pickup (PHR-803T) and his UV laser/electronics to sensitize Dry-film.
The optical pickup is used through his own connector without any modification. We deduced the pinout using reverse engineering and designed a driver for an Arduino UNO to control it. Basically, we can adjust the laser power, turn the laser on/off, move the focus lens servo and read the photodiode array signal.
The control of the pickup allowed us implementing a laser auto-focus algorithm based on the astigmatic method. Is the same method use it to focus the laser beam on the Blue Ray disc.
The mechanics is an X/Y Cartesian table which moves the pickup with two Nema 16 stepper motors and T2.5 timing-belts. Most of the printer framework has been printed with a 3D Reprap printer, so itʼs replicable.
We also developed the Arduino UNO firmware, based on 3D printer firmware Marlin, and the server side software which send the HPGL commands to the printer. Eagle Cadsoft complete the “tool-chain”. It supports HPGL in his CAM processor, so is easy to design the circuit with Eagle, generate the HPGL file and send it to the printer.
DiyouPCB is a prototype and it’s still not perfect: we have some resonance and vibration issues that affect the quality of printing, but it’s a first step to have an alternative method to indirect methods as the famous toner transfer.
DiyouPCB is a PCB printer which uses a Blue Ray™ pickup – [Link]
By understanding the manufacturing process you will be able design PCBs that can made more easily and cheaply. Designing boards that fit within industry standard specifications gives you two advantages: you keep down the cost of your end product, so that it will sell better; and you improve its long-term reliability, so that your customers will keep on coming back to you. And when you want to push the boundaries of technology (and who doesn’t?) you can sit down with your chosen board manufacturer and discuss your requirements knowing where he is coming from.
Eurocircuits – how to make a 4-layer PCB (full version) – [Link]