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Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

7
votes
2answers
77 views

Component designators on multi-pcb projects

I am currently working on a project that goes over multiple PCBs for the first time and realised that i don't know what the "standard" or best practice for component designators over two (or more) ...
4
votes
1answer
32 views

Is this possible to make a module with both castellations and LGA?

I am trying to decide on a pinout methodology for a module that will be assembled board to board on a bigger PCB. considering the pros and cons of LGA vs. castellations(cut half vias), i was thinking ...
0
votes
1answer
62 views

Creating a slotted & plated through-hole in EAGLE: where to draw milling outline

Problem summary I want to create a rectangular slot in my PCB for this component. Do I draw the milling outline on the footprint library or on the board after placing the component? Does it matter? I ...
1
vote
0answers
39 views

How to solve via on pad without plugging?

There are some vias on pad in my design. I've read some articles and know that these vias should be plugged to avoid solder wicking. However, the board house told me that they can't provide a plugging ...
5
votes
1answer
577 views

How to plug PCB into PLCC Socket

I have an IC that I need to replace by a small PCB. IC is currently plugged in the 44-pin PLCC socket. Is there a way I can keep this socket in place? That is, can I somehow "plug" this new PCB (which ...
0
votes
1answer
70 views

Vias not connected to ground plane

I recently designed my first 2 PCBs. Both have a 5v copper plane on the top layer and a ground plane on the bottom layer. I use short traces and vias to connect top components to the ground plane. ...
-1
votes
0answers
58 views

How to extend a PCB on one side

I used to connect PCBs above/below each other but this time I need to place them side by side. The PCBs are rectangular (same size) and they use I2C. Of course, I can just connect through-hole pads ...
2
votes
1answer
93 views

Can Silkscreen Go Directly Onto Copper PCB Layer? (No SolderMask)

Hi I am wondering if a PCB silkscreen layer can be printed directly onto a copper layer without a solder mask. I don't see this often but I have a design for which this would be useful. Has anyone ...
0
votes
2answers
71 views

In PCB DFM process; manufacturer have highlighted Gullwing Issue. What is Gullwing?

In PCB DFM process; manufacturer have highlighted Gullwing issue saying "Gullwing is not optimal robust SMT process. What is "Gullwing"?
0
votes
1answer
57 views

In PCB DFM analysis; manufacturer highlighted TOEPRINT ISSUE. What is component TOEPRINT?

PCB manufacturer have highlighted component TOEPRINT issue. Issue Statement: "Component is too close to another component TOEPRINT." What is mean by TOEPRINT?
0
votes
3answers
50 views

Equivalent Characteristic Impedance for Different Trace Widths

Suppose I have a PCB trace that needs to be impedance matched, but the trace width changes as it travels from its source to its destination. Something like this: The 5mil trace would have a certain ...
1
vote
0answers
55 views

Reversed silk screening on EasyEDA

Just a quick one. I'm not sure if the text should be mirrored on the bottom layer of EasyEDA. It seems okay in the 3D preview, but when I upload the gerber to JLC their preview shows it still reversed....
-1
votes
1answer
36 views

EAGLE GERBER files nit opening in CAM 350

I have chinese factory that I need to assemble PCB. They cannot open eagle gerber files, only altium how to fix
2
votes
2answers
80 views

Is it feasible to remove non-functional via pads on outer layers

During PCB design & manufacture it is common to remove the via annular rings on internal layers where the via is not connected to anything, so called non-functional pad removal. Would it be ...
1
vote
3answers
144 views

PCB plated through hole short-circuit

We have a board built in the thousands, and several have (apparently) short-circuited a plated through hole (PTH) to an adjacent pour (see photo, note the other thermal damage is probably due to ...
4
votes
1answer
247 views

What part type is denoted by SKx? [closed]

I’m fairly well versed in component labels like C1, R12, U72, etc but while taking apart a small external hard drive I found a component which looks to be made of ceramic labelled SK1. Now, crystals ...
1
vote
1answer
47 views

Accidentally Pasted Beyond Origin in Altium

I'm new in Altium and I accidentally pasted some pads and components(the ones at the bottom corner) from another pcb file but I wasn't aware of it at first because it didn't show on the sheet on the ...
4
votes
1answer
201 views

SMDs on bottom side of board with THT components?

I'm designing a PCB for factory production and I'm not sure if placing SMD components on the bottom side of the board, which also contains THT components (pin headers and buttons, they're all on the ...
11
votes
4answers
1k views

When are fiducials needed?

On a single-layer board with no through-hole and no machine placed components, is there any need for fiducials (for example to route the board outline)? Board house has asked for permission to add ...
4
votes
4answers
219 views

What PCB Plating do I need to use Exposed Copper Pads with Pogo Pins?

I am designing a PCB that will have some Mill-Max pogo pins make direct contact with exposed copper pads on the PCB. This will have many connects and disconnects, think hundreds to thousands. I know ...
2
votes
1answer
52 views

How long can a brand new PCB last before additional protective coating is required if any?

I have just made several PCBs for a large project using the photoresist method. (I ran the boards through sodium silicate developer then through ferric choride) I then rinsed off all chemicals and ...
0
votes
1answer
84 views

PCB inside a parallel port cable case

I designed a PCB to fit inside the case of a parallel port connector cable. It will be soldered, internally, to the pins of the cable connector. I already did a first version, I printed it on paper in ...
0
votes
0answers
85 views

Is it possible to find out current consumption of circuit design before giving it for manufacturing?

I want to measure the current consumption of my PCB design before giving it to PCB manufacturing. Is it possible..? If yes than what are the tools..?
0
votes
1answer
81 views

PCB key contact [closed]

Hi! anyone knows how to design a pcb like this in the photo with eagle? Someone has a guide to do it? I don't know how the resistor should be placed. It is basically a pcb for a synth, the key ...
1
vote
3answers
109 views

Best way to flatten PCB again after cutting with utility knife

I cut my presensitized PCBs down to size with rulers and a utility knife when I need a custom PCB. I noticed every time I cut one, the cut is always clean, but the copper on the board at the same ...
4
votes
2answers
224 views

Can I place an electrolytic capacitor close to a solder point on a two sided pcb?

I’m designing a pcb, which is going to be installed inside a metal chassis. To minimize space I will make it a two sided pcb. (See pictures) Because there will be parts mounted on the top face of the ...
0
votes
1answer
148 views

Photoresist PCB - Traces always gets washed away with developer

I have a positive acting presensitized UV-curable PCB board (link). I'm using the manufacturer-provided developer. Supposedly, the parts that get exposed will get washed away by the developer. ...
2
votes
2answers
348 views

Through hole components on a PCB

When prototyping diy PCBs, we would run a small wire from the underside of the board to the top and solder on both sides, wherever there was connection on both sides of a THT component, so there was ...
2
votes
1answer
85 views

Manufacturing PCBs for DDR3 memory

I'm currently designing a 4-layer PCB for a SOC (Allwinner A33 to be precise, 0.8mm-pitch BGA) with one DDR3 chip. Per DDR3 routing requirements, the traces need to have 50-ohm impedance. Also, they ...
0
votes
0answers
82 views

cause of photoresist removal after etching

I just tried to do a new PCB today with the photoresist method but what is very strange is that after etching it, I rinsed the board with water and wiped it dry, but as I wiped it dry with toilet ...
2
votes
2answers
95 views

Bubble etching versus rocker tank

I make my own PCBs and etch them in a homemade bubble tank. The tank has failed after a couple of years largely due to the etchant slowly eating it's way through some of the materials (glues, pipes, ...
0
votes
0answers
63 views

how does multilayer PCB Press/lamination machine work or bond the layers?

I just know the components involved in this process of bonding layers: Vacuum hot press to remove air bubbles, Piston Press to apply pressure and some temperature device to create the temperature. i ...
0
votes
0answers
40 views

Curly PCB lines [duplicate]

I was checking out this Raspberry Pi 3B when I turned it over and found that there are these curls made out of the printed material near the microcontroller. Why have these been made?
10
votes
4answers
2k views

My PCBs etch all bad! (sodium persulfate)

I've recently started having problems with etching my PCBs. I use a permanent marker to do the traces and etch them in a stainless steel cup, heated with a tea light (small candle.) The PCBs come ...
4
votes
2answers
678 views

Solder paste pattern

I recently downloaded a component's footprint and it comes with a peculiar solder paste pattern (see picture attached - solder paste is in gray). Until now I have just defined the solder paste to be ...
2
votes
1answer
112 views

Adding USB Tracks Directly on PCB with gold finish and contact lifetime

We are making a USB device but with the USB tracks on the PCB itself, something like this - My concern is regarding the life of such a product. How can I make it last as long as it would if I were ...
0
votes
2answers
94 views

Why would the capacitance of a co-planar pcb capacitor not match changes in nearby dielectric constant?

Background I have a piece of double sided PCB that I am plan to use a capacitor to measure soil moisture (somewhere between 133-170MHz). I used the "two-pin method" of measuring small capacitance on ...
8
votes
3answers
2k views

Should I cool off in water the desoldered components?

I use a REGULAR (for home-use, not for electronics) hot air gun to desolder non-SMD components from PCBs. The components are really hot (naturally) after desoldering and it takes a while until they ...
0
votes
3answers
92 views

Plated PCB Hole Shorting Power to GND?

I’ve been soldering components to my PCB; all has been good, but recently, after soldering a big electrolytic through hole cap, the power and gnd plane were shorted. This persisted even after removing ...
1
vote
1answer
36 views

Can we route using plated through hole in a Multilayer PCB?

Hi I'm designing a 4 Layer PCB for my project this is my first time using a ML4 Board. Layer Configuation are as follows. -L1 [red] -L2 (GND)[purple] -L3 [light blue] -L4 [dark blue] My question is I ...
35
votes
2answers
5k views

What did the manufacturer mean by asking if an angle should be made for the fingers?

I sent in Gerber files designed by someone else to PCBWay. It's a cartridge for a Commodore 64. They responded today with this question, and I'm not 100% sure what they are asking. Ref attached ...
-1
votes
2answers
708 views

Can I clean PCB using Petrol?

I was advised to clean PCB using petrol if alcohol is not available. I have tested doing it. Petrol and isopropile alcohol both works good on PCBs. I have also tried with asitone but it makes white ...
-1
votes
1answer
98 views

PCB Fabrication and Circuit Designing [closed]

What are the best resources and options available to initiate learning and practicing circuit designing and PCB fabrication? Any particular website, books or other such recommendable resources?
0
votes
2answers
120 views

In a 4-layer PCB, operating at a 8-16 MHz clock speed, should there be any copper pour on the top and bottom signal layers?

Currently I am designing a 4-layer PCB, with the layers as follows: (1st layer, top) signal (2nd layer) ground (3rd layer) power (4th layer, bottom) signal The clock frequency is either 8 MHz (...
0
votes
2answers
47 views

MT03-004 EDA Library

Currently working on my Honours project, we're designing a wide area sun sensor for an attitude control system of a picosatellite platform. We've elected to implement a COtS quad-photodiode package, ...
0
votes
0answers
63 views

1oz copper ok for card edge connector in prototype?

I'm doing a small prototype system and would like to fab boards at one of the inexpensive Chinese places like: https://www.elecrow.com/pcb-manufacturing.html I'm going to bus the boards using ribbon-...
24
votes
6answers
9k views

Have I placed too much on this PCB layout?

I am doing my first PCB layout (using Altium) and have finally gotten past the auto-router stage. The result is a mess and there are some missing nets and design rule violations. Have I packed too ...
0
votes
4answers
124 views

How should I connect my PCBs? [closed]

I will need to connect several PCBs within a single enclosure for the project I am working on (They are split to reduce cost should there be a manufacturing error). I need to connect an I2C Bus, 5V , ...
0
votes
2answers
456 views

PCB traces: oz to mil (thickness) conversion (for stripline)

According to http://referencedesigner.com/cal/cal_02.php, the conversion between "oz" and "mil" (thickness) for a PCB trace is 1.37. Also, according to zcalc.exe (...
1
vote
1answer
327 views

Unable to identify minimum trace spacing from Gerber file

I designed different PCBs using KiCAD, exported gerber and drill files and uploaded those to JLCPCB. However, I get the following warning: Can not identify the minimum trace spacing As far as I ...