I just finished writing up some of the details on DIY plated through holes. This is what the simple constant current source was designed for. This process was slightly adapted from Think and Tinker – a really great site for DIY PCB fab. The overall process is:
- Drill holes in the PCB
- Coat the holes with a mixture of water-proof ink and finely powdered graphite
- Cure the ink so it doesn’t rub off
- Dunk the PCB in the electroplating tank, apply current, and let chemistry do the rest of the work.
Electrochemically plated vias for homemade PCBs - [Link]
Retromaster has honed his PCB making skills to get professional quality boards at home. He’s successfully made double sided PCBs with 8 mil trace width, with 6 mil clearance. In his guide he describes how to etch the PCB with toner transfer, how to use mechanical vias, and hot to apply soldermask paint.
DIY double sided PCB with soldermask - [Link]
The PIC IC and RESET button are placed on the top side of the board. The voltage regulator, quartz crystal, and all the decoupling capacitors are on the bottom.
It was designed for the dsPIC33FJ256MC710 with digital signal controller peripherals, but it will work with most PICs in the same package. Schematic and PCB files are provided if you want to build your own.
Another Microchip TQFP 100 breakout board - [Link]
Luca wrote a step-by-step guide to Seeed Studio’s Fusion PCB service. It covers how to export files from Eagle and get your PCB built. It’s available both in English and Italian.
We like Fusion PCB service, it’s cheap and pretty fast. It starts at $10 for 10 PCBs ($1 per board), plus a few bucks of shipping. We’re biased though, so take our recommendation with a grain of salt.
A guide to Seeed Studio’s Fusion PCB service - [Link]
We bring you a favourite protective lacquer for PCBs in a convenient 1l bulk package. If you used this agent so far in a form of sprays, in a bigger amount, or you need to treat devices by dipping, then this package is intended just for you.
Plastik 70 is a transparent protective and insulating coating, protecting PCBs and components from humidity, leakages and also eliminates vibrations of small components. In case of necessity, for example at repair, it is solderable and also can be removed with the Plastik 70 thinner. It is not aggressive and is well compatible to most of material used in electronics, only in the case of some very sensitive plastics, it is suitable to test their sensitivity before application.
Advantages / Features:
- protective transparent coating
- high coverage – up to 9m2/liter/20μm
- protects from humidity and leakage currents
- protects from atmospheric influences
- removable by a thinner
- universal usage on various surfaces
Plastik 70 in a 1l package can be applied by a brush, dipping and after diluting also by spraying. Plastik 70 has a relatively low viscosity and a good penetration ability, that´s why it is an ideal solution for application by dipping of PCBs or single components like transformers and coils. Inspite of the fact, that the price per 1 liter of the product at sprays is similar to the price of 1l bulk package, this 1l package is more than 50% cheaper. It is caused by almost 2,5x higher yield (lower thinner content). Lower thinner content further improves working conditions in a workshop and decreases air pollution. PLASTIK 70 can also be used as a universal protective coating on surfaces like metal, paper, paintings, furniture, etc.
With the 1 liter package of Plastik 70 you can protect your PCBs 50% cheaper - [Link]
EagleUp is a new way to render Eagle PCBs in 3D. It integrates with Google Sketchup so it’s possible to design cases around the PCB model:
version 4 has been released. Most of the import and export procedures have been automatized to simplify the process, so that you can focus in design, and not in the conversion 2D/3D.
With the version 4, you export from Eagle in 2 clicks, and import into sketchup in 3 clicks. No more tiring image creation and manual import necessary. Give it a try !
EagleUP brings PCBs to Google Sketchup - [Link]
Making a PCB – PCB Manufacture step by step @ Eurocircuits – [via]
Step 01- Introduction – Eurocircuits Educational movies – making a PCB
Step 02 – Front-end tool data preparation
Step 03 – Preparing the phototools
Step 04 – Print inner layers
Step 05 – Etch inner layers
Step 06 -Register punch and Automatic Optical Inspection (AOI)
Step 07 – Lay-up and bond
Step 08 – Drilling the PCB
Step 09 – Electroless copper deposition
Step 10 – Image the outer layers
Step 11 – Plating
Step 12 – Etch outer layers
Step 13 – Apply soldermask
Step 14 – RoHS-compliant surface finishes – electroless gold over nickel
Step 15 – Plated gold edge connectors
Step 16 – Silk-screen and cure
Step 17 – Profiling
Step 18 – Electrical test
Step 19 – Final inspection
Making a PCB – PCB Manufacturing step by step - [Link]
PCB layout is tough. Laying out a PCB isn’t in itself too hard once you learn how the tools work, but high-speed (10MHz+) introduces a virtual mine field of potential issues that you may not be aware of until it’s too late. While experience is the best teacher, Analog Devices has a great application note explaining some of the key pitfalls to avoid when dealing with high speed designs (which is basically anything today): A Practical Guide to High-Speed Printed-Circuit-Board Layout. Some of it is a bit heady, but not more than it needs to be, and it really does lay out a lot of key information that you may not have been aware of. Want to improve your PCB design skills? Print this out, and keep reading through it until it starts to make sense. There’s years of bench time worth of information in there.
EEBookshelf: High Speed PCB Layout - [Link]
Converting an Inkjet Printer to Print PCBs. Ryan writes in… [via]
I really enjoy reading the Adafruit blog and thought my project would fit in perfectly. I’ve created an Instructable that follows my entire build process as I took a stock Epson C86 inkjet printer and modified it to print on copper clad board. Using this printer and a specialized ink I am able to simply print out boards and etch them. While this project has been done before I’ve yet to see a source where the modification is completely documented in a step-by-step fashion.
Converting an Inkjet Printer to Print PCBs - [Link]