About the manufacturing of PCBs (Printed Circuit Boards).

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0answers
46 views

Cheap CNC PCB machine kit [closed]

Is there a cheap kit available for making PCB's? I have looked over the internet and saw the mantis one, but I can't see a kit, only things like the design. I want one that is able to make PCB with ...
2
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3answers
72 views

Does ferric chloride etchant “go bad” after some period of time?

I have some old circuit board etching solution (ferric chloride) that is unused but a few years old and has not been in a temperature controlled environment. It has been sitting, all but forgotten, ...
2
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1answer
54 views

PCB assembly cost per-board

I know this question might get closed because of being opinion depended but I couldn't find any answer from google or any other search, so I decided to ask it here. For clarity of question I want to ...
0
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1answer
88 views

Suggestions for in-house PCB/FPC lab? [closed]

We are a hardware startup based out of Greece, looking for in-house PCB/FPC fabing solutions/equipment. LPKF's ProtoLaser U3/S look great but they cost $140K and $70K (if I'm not mistaken) ...
4
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2answers
164 views

Gerber - is my understanding of solder mask layer (GTS / GBS) correct?

I've just had a PCB manufactured for me, but it seems like the solder mask is only applied to where the copper is. I'm trying to figure out if it's my fault or not. According to my understanding ...
2
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0answers
43 views

Is 3dBi PCB etched GSM/GPRS Antenna Possible?

Is it possible to design a GSM/GPRS antenna that has a gain of 3dBi? if not, what is the maximum gain possible with a PCB GSM/GPRS etched antenna? I'm thinking of a PCB sized 11cm long and 5cm width. ...
0
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1answer
56 views

Why should PCB design be mirrored before toner transfer?

I am currently designing a PCB to make with the toner transfer method for the first time. I was reading a guide that said to mirror the image before printing it to the paper. However it seems that the ...
0
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1answer
70 views

What Gerber file extension is used to specify PCIe edge connector plating?

I am designing a PCB in Eagle using the mini PCIe card format and am not sure how to specify finger plating the board edge connector to the PCB fabricator. These plating regions are specified in Eagle ...
0
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1answer
59 views

What fedex paper to use for toner transfer

I am very new to creating PCBs and I am planning to make my first one in the upcoming weeks. I noticed that all the instructions and tutorials called for using a laser printer which I do not have ...
2
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1answer
194 views

Any better alternative to produce PCB than UV etching

I hope this is an appropriate question to ask it here. I work for a small start up company that has a limited budget. We have UV box, etching tank, etc from manufacturer like Mega UK. Our problem ...
5
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4answers
417 views

Why did my homemade PCB turn out like this?

I did a first experiment with the UV-lamp + Transparency + Presensitized-Board method. Using a randomly drawn pattern, this was my (promising but unsatisfactory) result: What could typically be ...
3
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3answers
150 views

Solder Mask and Pad Area (SMD vs NSMD)

I have been trying to figure out the "right" way to size pads for surface mount components, and I have found some conflicting wisdom floating around the internets. Lets say I have this hypothetical ...
11
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4answers
589 views

PCB, pads with holes but with different nets on top and bottom sides

I need pads with holes in by PCB, but the top and bottom side of the pads need to have different nets i.e. the top and bottom sides must be isolated. Here is the picture Is this possible to fabricate ...
8
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2answers
1k views

What is the use of the golden like coat on this circuit?

The below PCB belongs to a wireless access point. Could anyone explain what are the golden-like part of the circuit that is indicated by the red circles(ish)? What material is it? What is the the ...
0
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0answers
30 views

In pin-through-hole, how much bigger should the hole be than the pin? [duplicate]

I've been etching circuits. So I ask: how much bigger should the hole be than the pins I intend to put them in?
2
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2answers
90 views

Lead solder toxicity after cooling?

Now I am sure that most people have read discussions on the possible hazards of handling solder and how your supposed to wash your hands after handling it. My question is, after soldering something, ...
0
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0answers
71 views

Multiple Layers per Page Printed on Altium Designer

I use Altium Designer for PCB design. Usually, before ordering prototypes with a better finish, I make my own boards at home, as many do. I'm playing with the Press-n-Peel sheets for the tonner ...
4
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2answers
153 views

Creating printed circuit boards (PCBs) which aren't flat

I would like to create a printed circuit board (PCB) which is not flat and which is not shaped into a square, but don't know how to proceed. Can Cadsoft Eagle create such a board? If so, how? What ...
2
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1answer
73 views

Is a ceramic heater good to use in an etching process?

I use Sodium Persulfate as an enchant at a maximum temperature of 50 C. My experience with glass heaters is that they break if they are not fully submerged or if they are removed while it is warm ...
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3answers
110 views

Creating with BGA

I have a project that I've begun to work on, it's sort of an embedded PC type project, with a iMx6 arm processor. However, since this is a (potentially) commercial venture, we can't use prebuilt ...
0
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2answers
315 views

Making PCB with DVD Writer

Maybe sharing this idea after building a prototype would be much better. As many of you know, there is a technique to make a PCB with laser CNC. You spray a matte black paint onto PCB, and burn that ...
3
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1answer
214 views

What kind of PC board coating is this?

I recently came into possession of two large (approx. 3x4 ft) copper-clad fiberglass boards from a junk sale. These boards are consistent with typical printed circuit board material (thickness, ...
0
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0answers
47 views

Why is all my photoresist stripping?

I got presensitized positive boards from Injecterall, but I'm using Datak chemicals (positive developer and etchant). I used Datak boards before and the process was very smooth. This time, after ...
1
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2answers
71 views

Non-glass heating element for an etching tank

I have been using below glass heating element (the part name is ET20) on my etching tank. The problem is that the glass is too gentle that breaks very easy for many reasons, I already needed to ...
0
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1answer
73 views

PCB Trace Orientations [duplicate]

When inspecting a PCB earlier today it occurred to me that all traces you find on modern PCB's are confined to 45 degree increments with respect to the (typically square) board edges. What is the ...
3
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1answer
250 views

PCB design: the setting of the test point and the use of variable resistor

I am designing a PCB circuit and meeting two problems: My design includes a two-stage MFB band pass filter. To make sure the center frequency of the filters is the same, I need to add a variable ...
0
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2answers
108 views

Which layer of PCB is used to identify cut-out of individual boards within a panel?

Let's say I'm using a software like EagleCAD to create a panel with a few copies of a design (or even different designs). There is a "Dimension" layer (mapped to an Outline layer, e.g., GKO), but ...
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2answers
195 views

Is quality China manufacturing possible without being there? [closed]

I'm looking for some help with manufacturing in China with respect to PCB fabrication and assembly, plastic injection molding and metal forging/brushing. Common wisdom in our days is that one HAS to ...
1
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1answer
74 views

How many of these UV lamps do I need for PCB fab?

I want to build a PCB UV exposure unit. It will be in a wooden box, it will have lamps and a glass above them. Basic design. For the lamp drivers I will use the circuit from the neon lamps at home. ...
3
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1answer
111 views

How to choose PCB manufacturing technology/factory?

I have sent some PCB designs to factories for prototyping. The price, however, varies greatly. Some ask 200USD for a four-layer 5cm*10cm PCB prototyping. While some only ask for 50USD. I assume that ...
6
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4answers
2k views

Are acid traps real? (2014)

Some people online say that acute angles in trace routing will cause these problems: "Acid Trap" - PCB etchant gets stuck in the corner, and eats away too much, causing open circuit "Peelable" - ...
0
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1answer
64 views

adding limiter to reduce distortion in audio amp

I got this schematic from adafruit. But at high volumes, it exhibits distortion. A guy from Maxim Integrated referred to include a diode-resistor network(BAV99 and R-100 Ohm) b/w C22/C23 and R8/R9(to ...
7
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3answers
206 views

What rules and tips make automated assembly easy?

What rules and tips make automated assembly easy, rather than unnecessarily difficult or completely impossible? In particular, if I have a circuit board that works fine after hand assembly, some ...
5
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3answers
558 views

PCB fabrication vs PCB assembly

What is the difference between PCB fabrication and assembly? Some companies like Golden Phoenix list that based on the size of PCB, it outputs a quote. Mine was 2.1 x 1.6 inch. It outputted 29 pieces ...
21
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6answers
1k views

Is it better to route a pad to a trace, or a trace through a pad?

When routing a PCB, is it better to route a trace through a pad as in 1 below, or to route a pad to a trace as shown in ...
2
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3answers
742 views

What is a suitable temperature rise for PCB traces?

I'm designing a PCB for a 10A relay and am trying to determine what the trace width should be. According to this trace width calculator, the biggest factors in the width are copper thickness, ...
3
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3answers
349 views

How much clearance should you include in through-hole component holes? [duplicate]

Is there a general rule as to how much clearance you should add to through-hole components' holes to allow them to fit easily? For example, if I have a component with 1mm pin diameter, what should ...
1
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1answer
95 views

SMD component clearance limitations and guidelines?

I'm laying out a fairly compact PCB (first SMD design of this degree) and am concerned about how close some of my SMD components are getting. I've been unable to find any guidelines or advice online ...
4
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3answers
675 views

How to make final good looking prototype of our project?

The handmade projects we make contain a lot of loose wiring and are actually bad looking products. So what should I do to make my product look better and that we can actually sell directly to people? ...
9
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4answers
1k views

Why do PCBs always have an even number of layers?

Looking at many online PCB fabs, when spec'ing out a board and uploading your gerbers, often you select how many Layers your board should have. Invariably, the options are always multiples of two. ...
1
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1answer
90 views

Correcting printed PCB (add a via)

This board is a prototype for the project and is for testing. It is missing the soldermask and silkscreen layers, so correcting mistakes is very possible. The board was printed correctly, but somehow ...
0
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1answer
110 views

FR4 measurement tolerances

I am going to get a PCB produced, but was wondering how the FR4 thickness measurements work, i.e. how thick are 1.6 and 0.8 FR4, in millimeters, to a few decimal places?
1
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1answer
137 views

How can I quickly build PCB prototypes? [duplicate]

The development cycle of the company I work include building alfa prototypes, sometimes in breadboards, and beta prototypes in printed circuit board assembly. A considerable slice of the development ...
3
votes
1answer
185 views

What are the steps for a beginner to electronics to get custom PCBs made for a simple adapter?

I need to make an adapter between two 14-pin board-to-board connectors, one being a MicroMatch and the other being a JMC. What is the most straightforward way to get a PCB designed and ordered so ...
0
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1answer
162 views

gold finger plating needed on prototype board edge connector?

I am making a PCIe card and will be ordering prototypes. I know that in my production cards I should order hard gold plating on the edge connector. Can I skip this plating on my prototype cards to ...
2
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2answers
2k views

Altium Designer: How do I scale the output gerber file generated by Smart PDF into 1:1 ratio?

I'm trying to export a PCB layout PDF from Altium Designer 13.2.5. When my PCB design is open, I click Menu > File > Smart PDF... to open the PDF generation wizard. Throughout the wizard, I do the ...
0
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0answers
286 views

KiCad: Component outline on the soldering pad - will it disturb the soldering process?

Lots of KiCad's SMD components (including capacitors and resistors) print the component outlines over the solder pad. The pictures are shown below, please notice C25-27, R5-6 and D2-3 PCB design ...
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2answers
133 views

PCB - Why to use Iron chloride?

Soon, I'll try to create my own PCB with the iron chloride method. I watched a video on that and it seems quite "easy". The only thing that I don't understand is the need to put the PCB on the iron ...
2
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1answer
784 views

How to add Mouse Bites or V-Groove to PCB In Altium?

I know mouse bites are more used to snap off one of many of the same boards in a panelized array, but I'm hoping to put mouse bites to snap off part of the same board if that's possible. Is there ...
2
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3answers
171 views

Preventing corrosion of copper PCB tracks

I do DIY PCB with the following steps: ...