About the manufacturing of PCBs (Printed Circuit Boards).

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2
votes
2answers
299 views

Non plated through hole to PTH

I have defined Plated through holes on my PCB design.But somehow my pcb manufacturer has drilled it as non plated through hole and PCB has arrived.Now I need a suggestion to convert this non plated ...
1
vote
1answer
44 views

Printing PCBs using conductive paint? [closed]

Has anyone tried to use a programmable cutting machine like a Silhouette CAMEO to cut a stencil for a circuit and then used conductive paint to transfer it to a board? Could that work? What kind of ...
2
votes
1answer
86 views

Is one big PCB cheaper than multiple smaller ones, if so how to do this in Eagle PCB?

I have heard/read somewhere that one bigger PCB is cheaper than multiple smaller PCBs, is this correct? If so, then rather than order seperate PCBs for different parts of a project e.g main board ...
1
vote
1answer
20 views

Create breakout for iM880A-L

I currently need to work with the iM880A-L. As it is annoying and shaky to solder that thing on perfboard and attach cables, I want to create a breakout board with JTAG and SWD plug and pins for all ...
6
votes
1answer
163 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
1
vote
0answers
48 views

Problem isolating vias. Solder mask offset

I detected a shortcircuit between two vias in one of our PCBs. The shortcircuit was caused because an offset on the solder mask leaves part of the via's ring "half opened". When the PCB was assembled, ...
1
vote
0answers
57 views

How to make a flexible PCB cheaply? [closed]

I'm trying to make a flexible PCB for membrane keyboard circuit matrix. After some research I found material called Pyralux, which you can etch PCB on. But it's too expensive for me. Computer ...
3
votes
1answer
65 views

PCB Design Ruleset

I have just started learning PCB Design (using Altium Designner) and I have a basic question about PCB Rule set. Rule set is defined by the Altium, but can we edit the rule set according to our ...
1
vote
1answer
103 views

Are smartphone PCB designs at the bleeding edge?

I am working on a board design that is near the limits of the PCB fabricator's capability. It uses 4mil stacked microvias, via in pad, blind and buried vias, 3 mil trace/space, buried capacitance ...
1
vote
1answer
78 views

Can I wash my PCBs denatured alcohol

I have denatured alcohol which, according to wikipedia, is composed of roughly: 85% ethanol 10% water 3% methanol 1% aceton 1% pyridine My solution has a blue color. Can I use this as a ...
8
votes
2answers
357 views

What is this “paper-substrate pcb” technology called?

I took apart a broken calculator to show my daughter how it functions. It had a small "traditional" FR-4 PCB mounted underneath the LCD glass, but the pushbutton area was printed on a paper-like ...
0
votes
0answers
54 views

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 ...
0
votes
1answer
33 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
11
votes
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.
3
votes
2answers
96 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 ...
1
vote
1answer
108 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 ...
8
votes
4answers
435 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 ...
4
votes
1answer
236 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 ...
1
vote
1answer
47 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 ...
5
votes
3answers
206 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 ...
0
votes
0answers
44 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. ...
1
vote
1answer
106 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 ...
3
votes
2answers
110 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 ...
5
votes
2answers
174 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 ...
5
votes
4answers
192 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 ...
2
votes
1answer
103 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
votes
1answer
198 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 ...
0
votes
1answer
104 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 ...
0
votes
1answer
50 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 ...
0
votes
2answers
50 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?
0
votes
0answers
73 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? ...
3
votes
1answer
90 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
votes
1answer
103 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 ...
0
votes
1answer
64 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?
3
votes
6answers
700 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 ...
5
votes
3answers
707 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. ...
2
votes
2answers
166 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 ...
1
vote
3answers
150 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 ...
8
votes
4answers
788 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 ...
1
vote
0answers
71 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 ...
1
vote
2answers
117 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 ...
0
votes
1answer
68 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 ...
3
votes
1answer
118 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 ...
1
vote
2answers
259 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 ...
1
vote
1answer
149 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 ...
4
votes
1answer
124 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 ...
10
votes
2answers
814 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 ...
2
votes
3answers
308 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 ...
3
votes
1answer
197 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" ...
0
votes
2answers
88 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, ...