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Questions tagged [manufacturing]

The tag has no usage guidance.

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0answers
27 views

What determines the cost of manufacturing of a computer chip? [duplicate]

I am not sure if this is the right place to ask this but here goes: As far as I know, there is a high correlation in computer chips between performance and manufacturing cost. At least, there is a ...
7
votes
3answers
3k views

What is this small unconnected solder blob on this PCB?

There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. ...
2
votes
2answers
64 views

Usefull 0402 and 0603 solderbridge footprints compatible with machine manufacturing?

I am currently in process of my eagle library cleanup, and came up with the idea to create a footprint similar to the one from nucleo boards. Those pads are meant to be easily bridged by just solder ...
1
vote
2answers
152 views

Do any commercial products use dead bug construction? [closed]

I'm talking about connecting electronic components without using a PCB. Soldering such an assembly is pretty fast if you have a jig holding the components in place. (The examples below are laid out ...
0
votes
3answers
92 views

Makeshift SMT Station. Any suggestions? [closed]

I am trying to do some surface mount soldering for my project and have hit a few snags. My hot air gun works perfectly fine for most of the PCBs I am making but one type in particular is problematic....
7
votes
1answer
130 views

Do Soft Termination Caps Really Increase Reliability?

I'm managing several designs. At one point I identified a few failures that were caused by 0603 caps failing short. After that I switched to all soft-term caps to hopefully eliminate the problem. ...
5
votes
2answers
93 views

How to deal with unused components in pick-and-place file?

I intend to send a board to a PCB manufacturer and I am wondering how to mark unused components in the pick and place file. I'm using EAGLE and I saw that it includes all components in the file, but I ...
-2
votes
1answer
91 views

In Altium Why My Square slot is shown round in Gerber?

In Altium I have created a square slot in PCB then I create the gerber files. In CAM, file's square slot is shown as round shape. Can anyone explain why? Also I have enabled the G85 command.
3
votes
1answer
96 views

Manufacturing of Translucent LED Indicating Symbols (e.g. router indicator lights) [closed]

I've been researching how manufacturers create custom LED-illuminated symbols such as those seen on the router in the image below: I haven't been able to find any information online from custom ...
13
votes
3answers
289 views

LEDs no longer bang - or whimper!

I volunteer at a club to teach Arduino programming to teens. As part of that, of course, I talk about voltage, current and what not to do. My prime example is taking an LED, putting it directly across ...
3
votes
1answer
98 views

logic level conversions for opto-isolators in digital input acquisition

This isn't my usual job, I'm not an EE, but I want to give it shot... This question concerns developing an interface board to connect a device (DUT) to a test system in a manufacturing scenario. ...
0
votes
0answers
82 views

Fast but affordable way to crimp dupont connectors

I'm currently doing a small production run of a board I designed. It features a few pin header type dupont connectors which are used to attach cables to the board. Now, I can surely crimp this using ...
2
votes
1answer
192 views

How are glass diodes produced?

What I am trying to understand is how the diode is placed inside of the encapsulating glass container such as that pictured in the following: I've tried to read some patents, where I more or less ...
-2
votes
1answer
101 views

Still 1000 hours of lifetime [closed]

I am familiar with the famous Phoebus cartel of the companies Osram, Philips and GE, but this cartel began its operation in 1924 and lasted at most to the World War II. In the second half of the 20th ...
0
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0answers
142 views

Tape and Reel: Paper versus embossed tape

Especially for passives (such as MLCCs), I see manufacturers provide two types of tape options: paper or embossed. I see typically that embossed is a little bit more expensive. Looking at the two ...
0
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0answers
28 views

electronic manufacturing supplier, qutoation process

Do CMs (contract manufactures) run a full CAM (computer aided manufacturing) inspection on gerbers (or is it a 'light' CAM)? I would also like to a crude equation for estimating assembly cost (or a ...
1
vote
1answer
84 views

Does Apple or Qualcomm do product binning for their SoCs?

It's well known that Intel does product binning with their CPUs — essentially selling the same chip as multiple different chips with different specs and prices based on the tested properties of the ...
9
votes
4answers
2k views

Why are accelerometers (and other MEMS devices) so rarely integrated into components?

With the way things are headed, more and more functionality moves into a single chip each year. However, one thing that seems to remain completely untouched by this is MEMS devices like accelerometers ...
0
votes
1answer
50 views

Any script for detecting PCB size or the trace width/spacing

everytime I place an order on PCB manufacturers (such as PCBWay), I need to fill out the related parameters of my boards - the width, the length, the trace , holes and etc. Has anyone tried to work ...
-1
votes
1answer
1k views

JL (or maybe something else) misterious branded IC's [closed]

Take a look at this example of an IC found on a circuit board: Brand is found on many PCB's of Chinese/India manufacturers of different kind of devices, mostly consumer based. For example, there are ...
2
votes
2answers
130 views

Will PCB assemblers solder wires to the board?

When preparing a medium run prototype, are there any manufacturers out there who will solder wires to you if you ask? For example, I have a device with 6 sensor pins. I'm hoping that a manufacturer, ...
0
votes
0answers
182 views

Mass Production: Espressif prodution programming, serial and tests

I am hitting the production phase of my project very soon and the production programming part is still blurry. I am using the ESP32 Wroom-32 module, and it seems like no professional module has yet ...
0
votes
1answer
113 views

CE certification

One of the required CE test technical files is "Test Reports". This document has to be provided to the test agency. Does anyone know what data should be included in this document? Here are the ...
3
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1answer
122 views

How Do They Make Surface Mount Capacitors and Resistors?

With the ever decreasing size of surface mount resistors and capacitors, how do they make such small components?
0
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4answers
269 views

Creating an Assembly Drawing for Fabrication Houses

I have a design for a PCB that I have been thinking about producing. One thing that I have found is that I need is something called an assembly drawing. So far, all I have been able to come up with is ...
3
votes
1answer
387 views

How much does it cost to prototype an analog IC?

There are many paper I see on IEEE website that claims they build their custom designed circuit on a CMOS process. Examples are 5.9GHz ring oscillator and 32-Gb/s serial link equalizer. I know that ...
0
votes
1answer
92 views

STM32F103xxxx VFQFPN 36 pin package thermal pad, isolated or tied to ground?

Currently designing a PCB based on the STM32F103. The package is a VFQFPN 36 pin package, which also has a large thermal pad. The datasheet for this part does not appear to indicate a pin number or ...
10
votes
2answers
2k views

Mounting components on both sides of a PCB

I'm designing a PCB with a microcontroller ,CAN transceiver, sensor (I2C) and linear regulator. I want to make the PCB as small as possible, so my thoughts were to use both sides of a two layer stack ...
0
votes
1answer
110 views

Mass producing my electronics/raspberry-pi idea - What are the steps? [closed]

Could somebody tell me what the rough steps would look like? I think I have a good idea. I have put things into practice, and it's working and so on, but it's very ugly. I guess, first I would have ...
0
votes
2answers
110 views

Newbie on SMD. From THM to SMD PCB design and manufacturing [closed]

I have made a prototype of a device using THM technology. Now one of my successful friends has suggested me to move the design to SMD technology to reduce component and PCB manufacturing costs. I have ...
5
votes
1answer
377 views

12-bit vs 16-bit DAC

When a vendor like Analog Devices offers a DAC family with nearly identical parts like the AD5671/AD5721 are both devices the same die but rated into different accuracy classes like CPUs? Is the 12-...
1
vote
1answer
195 views

What components have a MSL of 5 and 6?

Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions for some semiconductors. Components with an MSL of 1 have an unlimited floor life, whereas components with an MSL of ...
11
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3answers
3k views

Can I assume counterfeit components?

I recently received a run of 10 PCBs from a manufacturer in China, and am worried they have begun to cut corners and source counterfeit parts. Here is why: I had them do full turnkey production (PCB ...
1
vote
2answers
307 views

Exporting fabrication files (gerber) in Altium leads to wrong connections

I'm going to print my first PCB wich is a small controller, nothing complicated. I know that I need to output GERBER or GERBER-X2 files. I prefer GERBERX2 because it comes with the board outline for ...
1
vote
2answers
518 views

Shared support chips and tooling between 16 and 32-bit computers

Can a production line for a 16-bit computer save significantly on unit cost by sharing support chips and tooling with another 16-bit computer, to a greater extent than if it went 32-bit? To be ...
1
vote
1answer
256 views

Using Beaglebone Black to prototype commercial product

I am designing a system and it's safe to say I am a little out of my depth. The requirements of the project are as follows; drive 7" WVGA touch screen and generate graphics 4-20mA input 3 x 4-20mA ...
2
votes
1answer
53 views

Where can I find ultrasound machine regulations?

Diagnostic ultrasound machines are limited in their output power so that the sound waves don't cavity the microbubbles in the body. What I want to know is how do manufacturers prove their power ...
2
votes
4answers
234 views

Choosing a PCB Manufacturer/Assembler for the first time [closed]

I've just finished designing my first PCB, and I'm about to send out a batch of emails for quotes from manufacturing/assembly shops. My design is super simple: the only components are 7 identical SMD ...
0
votes
0answers
194 views

Leaded wave soldering temperature on “lead free PCB”

I've a question regarding what temperature is recommended on a leaded wave soldering machine? Background of question The case is that I've the option to use a leaded (when customer allows) or a lead-...
13
votes
5answers
2k views

Why put unpopulated components on a BOM?

I've ran into quite a few engineers from unrelated backgrounds that put unpopulated components on the BOM. Some will do a section clearly labelled DNP at the bottom, others will leave them dispersed ...
0
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1answer
75 views

Production programming: is there a practical size limit to serialization length? [closed]

This is a follow on question from the answers of these two: Is it practical for firmware to be uniquely identified in production How to verify hardware is legitimate I would like to be able to ...
1
vote
2answers
643 views

Many small via vs few bigger via

While I was designing a board I thought, if we want to make a better path for the current what is the best choise? Small vias and big in numbers or fewer but with bigger hole?
11
votes
10answers
3k views

Is it practical for firmware to be uniquely identified in production

Are there systems available in large scale manufacturing that allow a unique serial number to be programmed into the firmware or some free memory space for each PCB that comes through? I've found ...
3
votes
1answer
99 views

Term for a guarantee a manufacture makes that a product will be produced for a number of years?

Sometimes manufactures of electrical components guarantees that a product will be produced for a number of years so you can rely on getting new components for future production runs. What is the term ...
0
votes
0answers
47 views

When did they start making SMD2835 and others

i'm trying to build the chart of LED efficacy and power change over the past couple of years. does anybody know when did they start making 2835, 3528, 3014, 5630? google gives me 2015ish for 2835, ...
0
votes
1answer
292 views

Programming flash in manufacturing environment using Codewarrior TAP

I would like to use the Codewarrior TAP to program flash on boards in a manufacturing environment. My target is a P4080 CPU w/Flash memory. I am currently using an Abatron BDI-3000 for this, but ...
0
votes
0answers
824 views

Half-etched fiducials Vs through-cut fiducials

While making PCB, I added 8 fiducials (fids) marks so that pick and place machines use these marks as referent points on the PCB to position the surface mount components (Packages) during assembly. ...
1
vote
1answer
2k views

Which minimum tracking/spacing size is actually required for a 0.2mm gap between LQFP leads?

I am uncertain as to the manufacturing specifications that I will need for a PCB I am hoping to get produced. The most complex component is the MCU (STM32151RCT) which has a recommended footprint for ...
1
vote
2answers
144 views

Precision and manufacturing of resistors

I am trying to understand why there is variations in resistance values, in other words, why there is difference in the value of the resistance between color code and the measured resistance. Also, how ...
0
votes
1answer
107 views

Solder paste for stencil

I'm going to solder a small pcb with reflow process and I'd like to use a stencil for that because the components are too tiny for hand soldering iron. The pcb has a QFN32 (0.5mm pitch and exposed pad)...