About the manufacturing of PCBs (Printed Circuit Boards).

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PCB Documentation for fabrication using allegro

I generally used to design PCB export PDF and create fabrication notes separately. Recently I needed one board to designed by professional and I was surprised to see the complete sheet and fab notes ...
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1answer
22 views

Converting Altium STP/STL model into solidwork

I need my STP/STL model to be re-captured in the 3D workspace environment from Altium to SolidWorks. Can any one help me on this and can it indeed be done? Norman
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3answers
2k views

Is 3D printing of PCBs possible?

I just saw this picture about PCB 3D printing on a website, can it work in real life? It's would be so cool, if it could useful in the real life.
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2answers
69 views

ENIG or HASL for prototype with small pitch and expectation to need rework

I have a project where I'm about to order the PCB's for a first prototype, and I'm staring at the option of HASL vs. ENIG on the website. I will hand solder it with an iron, the smallest pitch part is ...
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1answer
46 views

Altium Power Plane Gerber inverted

Good Day I used internal power planes for the first time (Altium), and I now want to generate fabrication outputs in the form of Gerbers. The gerber below illustrates my internal GND plane, to ...
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4answers
410 views

Placing a mounting hole partially outside the board

I have a board currently 50x30 mm. And I need to have 4 mounting holes on it. Bad news is that I don't have enough space to place them in regular way. Now I made the following thing: I placed four ...
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1answer
75 views

Altium hide component designators in fabrication ourput gerber

As the title says, is there a way to hide the component designators in the fabrication ourput in Altium AD15? I have a very tight board with 0402 parts very close, so there is no room for the ...
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1answer
44 views

Presensitised-PCB Build Method

After completing many basic circuits on stripboard and premade PCB I've decided to try my hand at making my own PCB. Following some other forum posts this seems do-able but will likely take some trial ...
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3answers
162 views

How to break apart grooved PCB

I recently got a set of 20 breakout PCBs. I didn't realize that they came in one piece- that they had not been cut apart yet. However, there are grooves between each board that are cut into the ...
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40 views

TSSOP breakout board toner transfer pcb hints

Friends, Hi! I'm going to play a bit with MCU in TSSOP package. Usually I use small hand-drawn breakout boards to plug small chips into the breadboard. However I can't hand-draw 0.65 pitch tracks. ...
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1answer
73 views

Chamfer the corners of PCB

Almost all the PCBs I've seen for now are right angle. But I think such acute angles are not safe for handing, even when installed on the products, it may do some bad to the wires connecting the ...
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2answers
79 views

Eagle: PCB layers stack-up and impedance

I had a PCB board with 8 layers to be fabricated. I have used an opensource deign modified it a bit and want to get them fabricated. The PCB company asked me to provide layer stack and impedance ...
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2answers
136 views

What is the typical PCB fabrication process in a professional PCB house?

I have been etching my own boards as part of my hobby interest into electronics, and I can't help but wonder how exactly is the typical printed circuit board manufactured? Unfortunately, details on ...
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4answers
94 views

What type of paper is good for the toner transfer PCB process?

I've been using magazines and it works about half of the time. Thick sheets work better but they are hard to find and I must cut them to size. I'd rather just have something that works so I bought ...
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1answer
72 views

Proper storage of ferric cloride PCB etchant

I etch about half a dozen printed circuit boards each year at home, using an aqueous ferric chloride AKA iron(III) chloride etchant solution. As I want to minimize the costs and hassle of buying new ...
2
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1answer
102 views

Eagle - Oval pad

How to make a through hole pad other than circular shape in Eagle? I need an elongated circle / elliptical sort of pad. This is the best I could achieve: This is what I did: 1) Made polygons on ...
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1answer
94 views

How to probe traces on a PCB

I have some PCB's that I have ordered from China. The PCB has a BGA component along with traces which go from the BGA component to another BGA IC(USB controller) and finally to USB. Right now I am ...
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1answer
48 views

Where can I find some basic information about ICT? [closed]

I'm trying to find some information about the basics of ICT (In Circuit Testing) but having trouble finding anything useful. From the few things I managed to find, I gather that an ICT tester is a ...
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2answers
45 views

PCB coating for a high temperature environment

What PCB coating is good for a high temperature environment (my environment is about 30-70 C), and is available in a spray can or so that is easy to implement without need of a device/machine?
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46 views

Sprint-Layout 6.0 transfer gerber problem.need someboby help

is there any people use Sprint-Layout 6.0 pcb design program? after I transfer the pcb design into gerber file, the CAM350 can not open the gerber file successful? is it any wrong when i transfer? ...
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1answer
75 views

Apply etch resist on copper

I cannot get my toner etch resist on to my copper board. I'm doing with the iron, but each time I try the ink does not transfer completely. I've tried many things - applying some water on it, ...
4
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1answer
87 views

Galvanic action on gold plated PCB

It has been always said that having gold plating on a PCB has lots of advantages. Not only does it give a good clean low resistance contact, but the perfect flat surface. However based on the galvanic ...
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1answer
45 views

V-cut gerber format

I prepared a panel on Eagle Cad. now I am preparing Gerber files for the production. What device output and file extension do I need to save the v-cut layer?
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6answers
480 views

DIY PCB Manufacture: Photoresist or Toner Transfer?

So here's what happening: I have my board layout ready to go on eagle, and am looking for a good way to produce this board at home, of a quantity of about 2 or 3, so not large scale at all. All the ...
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3answers
678 views

Good way to affordably manufacture low-quantity PCB?

I am thinking about making an open-source development board for a specific field in power conversion. If there is interest from local universities, I will manufacture a few hundreds of these boards. ...
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2answers
107 views

Components to avoid using on an ultrasonic cleaner

What components populated on a PCB are not safe to clean in an ultrasonic cleaner? It is not limited, but I specifically wonder below components if they are safe to use or some requires special ...
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3answers
127 views

Four layer PCB, leaks current on edges

I was testing a four-layer PCB and got electric shocks several times when trying to touch the edges of the PCB. The four layers are: top/+15V/ground/bottom layer. It seems that there are several ...
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4answers
700 views

Is it always possible to reduce the number of layers on a PCB by making the board larger

I see that a 2 layer PCB is really cheap to prototype. A 4 layer PCB is almost 4x more expensive . I have a design that uses DDR3 RAM where I need to match trace lengths. However I also need to keep ...
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62 views

castellated holes size and spacing

I'm about to create surface mountable module with at least 65 castellated mounting holes but I am wondering about few things: Is there a minimum size for a castellated hole? Is there a minimum ...
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2answers
100 views

How to etch Double sided pcb?

I am trying to etch my circuit on a double sided copper clad at home. After designing my circuit I took a print on tracing paper and used iron to get the trace on copper clad. When I used iron paper ...
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1answer
59 views

Is every pad in eagle a via?

Correct me if Im wrong, a via is a hole that join two or more layers in a PCB. I have a PCB design who has the pads to solder but I want solder only one side, do all my pads that are connected to my ...
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1answer
103 views

Are we still protecting pcbs with wax?

I've just replaced my smoke detector. It was manufactured in 2006 by BRK. This is an ionization-style detector. I took it apart and the track side of the circuit board is covered with a thick waxy ...
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2answers
154 views

How much space should be left between a PCB's edge and traces and holes

I am designing a PCB for use with an Arduino mega and I am wondering if there is a good rule for how much space I should leave between the edge of the PCB and various items like: traces (ground, 5v ...
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1answer
137 views

Pastemask. Manufacturing PCBs

after finishing some designs, it is time to manufacture and assemble them. For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...
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1answer
101 views

How to reduce the AVR MCU footprints on PCB? [duplicate]

I want to make my circuit board very small. I have seen many smaller boards with complex circuit. But I am not sure how do they do it? Is it all Custom circuit implemented on VHDL or some micro ...
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2answers
795 views

What is the purpose of the brown pads on this PCB?

This PCB has wire connections to external coils that are soldered to pads on the board. Each of the connections has a patch of brown material carefully placed in between the two pads. What is the ...
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3answers
202 views

QFN Standoff (Solder Joint) Height

When designing a QFN footprint, I've read from (reputation limited, only 2) sources... http://www.freescale.com/files/analog/doc/app_note/AN1902.pdf http://www.atmel.com/images/doc8583.pdf ...that ...
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77 views

Is there any way to inspect small holes (in micron scale) inside a PCB non-destructively?

I have PCBs with two layers of copper at top and bottom. PCBs with low quality have holes between top layer copper and epoxy. The holes are in near circle shape with 20 - 70 micrometres of diameter ...
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1answer
136 views

Via's without annular ring on internal layers

My PCB layout package (Altium) has an option to define the full stack of a via so one may have different sized annular rings on different layers. I was wondering if it is considered "manufacturable" ...
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2answers
86 views

How an electrical component behave after being exposed to excessive current/voltage? [closed]

I wan't to know more about how to recognize a damaged component due to excessive impulse or constant current exposure. Particularly resistors, ceramic/electrolyte capacitors, protective diodes, ...
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1answer
88 views

Hydrogen Peroxide for PCB Etching

I found 500 mL of hydrogen peroxide. It says 12% and food grade. Normally, before, what I found was 3% only, and there wasn't any note like food grade at all. Is this suitable while etching PCB? Is ...
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3answers
424 views

Panelization (& Depaneling) a Metal Core PCB

What is preferred way to panelise a Metal Core PCB (MCPCB) - V-scoring or Tab-routing? The engineering challenge I am facing is that the boards are meant for production (1,000 qty in the initial ...
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1answer
59 views

How do I make a through-hole via? [duplicate]

Using a simple PCB with copper on both sides but naturally in between, is it feasible for a hobbyist to make through-hole vias like this: It seems there is copper in the via itself, isn't there? ...
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0answers
50 views

PCB Cleaning for Manufacturing

We produce PCBs in quantity on an automated line. We then have been washing them en mass in a spray-washer that looks like a dishwasher. It uses a saponifier with water to dissolve all the crud on the ...
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2answers
513 views

Place a component on specific height above the PCB

what I have as a big issue is the following layout with two connectors. The problem is that the connector K201 (in right bottom) is very close to the frame. This frame will the attached to a device so ...
5
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4answers
377 views

Clear material for UV Box

I have constructed an UV light box using the innards of a commercially available finger nail drying unit consisting of 4* 9w tubes. (should be more than enough). I have had very poor results in ...
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1answer
126 views

What constitutes a Via-in-Pad?

Would any of the via's in the picture be considered a via-in-pad? or is it only if it's dead center of the pad?
3
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1answer
124 views

What are “slash sheets”, and how do they relate to PCB substrates?

I am trying to specify the stackup for a PCB. Previously I have used whatever the board house considered to be their "standard" stackup. This time I am looking at using FR-408 (pdf) because of its ...
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1answer
113 views

What are the recommended trace width and clearance on homemade PCB's?

I know that there are multiple processes and lots of variables regarding homemade PCB manufacturing. Using the right tools it is possible to achieve professional levels. I'm concerned for students ...
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135 views

Using a CFL ballast to power 9W UV tubes

I would like to build a low-cost home UV exposure box for PCB manufacturing. Recently my attention was brought to these dirt cheap UV bulbs which are used in manicure drying lamps. I have the ballast ...