The process of mounting electronic components onto a printed circuit board. This can be done manually with a soldering iron, or automatically using a "Pick and Place" machine.

learn more… | top users | synonyms

1
vote
2answers
54 views

Connectors in high volume manufacturing?

How are connectors such as USB handled in high volume manufacture? Would the panelized board leave room to place these connectors or would the panel be cut apart and the connectors added later. Is ...
3
votes
6answers
621 views

Why are there no easy-to-solder SMD diodes in 0603 packages?

What seem to be the most popular SMD diodes currently come in SC-79 packages, but they super tiny and really hard to hand solder... ...and they also can be a hassle even for reflow. So I thought ...
0
votes
1answer
80 views

PCB lab equipment

I was thinking of buying parts to make equipment for PCB production. I have the knowledge and the experience with PCB production from school (about 10 years ago), but I have no knowledge about the UV ...
0
votes
1answer
61 views

Can I place my inductors in parallel to make a Flyback?

I would like to build a flyback and I've tried simulating my circuit in LTSPICE, in which I coupled a PCH-45X-824 inductor (820┬ÁH, 986mA pk) with a 744139 WE-SI inductor (1.124mH, 3A pk). It works ...
1
vote
2answers
16 views

How to determine which size of surface mount resistor for an ADMP441

I'm relatively new to reflow surface mount soldering and am unfamiliar with the various sizes of components. The PCB design I ordered is here: https://oshpark.com/shared_projects/ypqAU3CH But I ...
1
vote
2answers
84 views

Nomenclature for tested PCB assemblies

I want to unambiguously refer to an assembled PCB that has been tested. I am familiar with the terms: PCB - unpopulated printed circuit board PCBA - PCB assembly, a PCB with all the parts fitted and ...
-2
votes
1answer
50 views

Arcade stick PCB not working as expected

I am using Logitech precision PCB to make an arcade stick. I am having a problem in button 1 (green) area. While I try to solder button 1 via R2, I had a great difficulty - R2 resistor moved every ...
2
votes
1answer
82 views

Impact of PCB revisions on its embedded software

Over the past couple of years we have done some minor revisions to our PCB, including Different component selection (resistors / caps / ...) based on availability / price (while still taking into ...
-3
votes
1answer
111 views

How do I solder this red part in PCB?

I am making an arcade stick. I was making good progress on the right hand side but now stuck on this red circle bit. For the RHS I had this socket(?) that I can put solder on easily But this red ...
3
votes
1answer
66 views

PCB fab and assembly, how to resolve width problem between adjacent pads?

I have just sent off for some pcbs to be fabricated and assembled, I have used this company before for fab but not assembly with no problems a few times. They have just sent back a issue I need to ...
2
votes
2answers
337 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
3answers
52 views

how to get a breakout made for module that doesn't have one?

I'm just starting out in this field and I got ideas for projects I want to build but I'm running into problems, not so much with how to find the part I want or how to get it to work. but how to ...
0
votes
1answer
47 views

Best way to prototype a TDFN package chip (MAX9814 and MAX9820)?

For my engineering project, we wanted to use the gain control and amplifier available on these two chips, but are finding difficulty with prototyping them as they are so tiny. One of the chips is a 14 ...
3
votes
2answers
127 views

Possible to Solder top of through-hole header?

I have designed a small 2-sided PCB with through-hole parts, which I plan to have fabbed professionally. Given the lack of space (2"x2" was a design constraint to keep costs low, as I will need a ...
0
votes
1answer
38 views

TVS unintentionally shorting on USB?

I had a very peculiar situation on a PCB I am working on, and the only possibility I can think of is that my assembler installed the wrong chip on my board. I'd like to present it to the forum to see ...
1
vote
0answers
39 views

how to identify pads of a chip antenna?

I am using a chip antenna called ACA-102-T. The linked document says that Pad No1 is the input pad, and Pad No2 is the ground short pad and an example circuit I am going to solder the ...
0
votes
0answers
53 views

How to Clean Solder Stencils?

I have had great success in the past using the reflow soldering method, using a syringe and needle to apply the paste to the board. However, I found myself repeatedly making the same boards so I ...
14
votes
3answers
1k views

Replace SOT-23 (5 pin) package in production with wire

I have found a hardware bug on a board design after many PCBs have been manufactured but not populated. I can fix the problem by removing a SOT-23 component and putting a wire across two of the pads. ...
1
vote
1answer
97 views

Can anyone indetify this SMD component?

This is from N9005 phone and i would love to know what SMD component is this. Here is a photo. Thank]1
3
votes
1answer
91 views

How are system configuration flash or eeprom chips programmed?

I've seen, quite often actually, a circuit that will have an eeprom or flash chip soldered next to the application chip. Take a look at the ESP8266, it has some kind of programmable memory that sets ...
1
vote
1answer
131 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 ...
2
votes
2answers
275 views

How to avoid solder bridges between LGA-16 pads (paste applied manually)?

I made a breakout board for an LGA-16 part (LIS3DH) and two attempts at soldering failed with a solder bridge between two pads. Top view of the PCB: The land pattern was created according to ST's ...
0
votes
1answer
125 views

What should I consider before purchasing a professional Pick and Place machine?

I am thinking to expand business and go with a professional pick and place machine. Not the most expensive, but not the cheaper ones. I will ask about software licenses/usage, training and post sales ...
6
votes
1answer
103 views

Soldering a male-female bus connector

'Stackable bus connectors' are common nowadays on Arduino and other boards where a single connector has both the male pins (for the board below) and female sockets (for the board above) In DIY ...
3
votes
4answers
1k views

Is it ok to clip component leads after soldering?

When working with through the hole components, I have read that you should clip leads before soldering so the shock from clipping doesn't break the joint. On the other hand I've seen a ton of ...
1
vote
2answers
82 views

Component bodies physically touching

Is it ok when components touch each other (with body, not leads) after assembly? I know that resistors should be ok, but how about capacitors? Is it ok when I assemble them densely? Will there be any ...
5
votes
3answers
735 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. ...
1
vote
4answers
310 views

Small and cheap pcb-to-pcb connection [closed]

I'm looking for a smart way to connect two PCB's in a cheap manner. I would prefer not to use any external components for the connection (if possible). The PCB's are rather small (20 x 20 mm). Do ...
7
votes
1answer
91 views

What initial orientation do pick&place machines use when applying the “rotation angle”?

PCB assemblers require a file describing the component identifiers, the X and Y coordinates of the centre, and the rotation angle. I generate that file automatically from my CAD package (DesignSpark ...
1
vote
3answers
171 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 "...
1
vote
1answer
211 views

Is there a problem to solder only one side of a dual PCB?

If I do a double layer PCB (with the toner method) is there a problem if a solder the bottom side only? there are parts that are so hard to solder from the top layer, do I have to solder everything in ...
1
vote
1answer
156 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 ...
2
votes
3answers
388 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 ...
2
votes
0answers
64 views

Can flux residue affect sensitive ADC circuitry?

I have designed a product that uses a T.I. ADS1230 20-bit Delta-Sigma ADC. I've assembled 20 prototype boards. Two of those boards are having completely insane oscillations (+30/-30 raw values) with ...
3
votes
3answers
236 views

Steps to ensure greatest success in PCBA production runs?

We periodically get some boards produced and assembled in small runs of 50 - 200. The PCBA company just makes and loads the boards (SMD reflow), we do the programming and testing after delivery ...
0
votes
1answer
144 views

Tethering a TO-92 IC to a PCB

I need to tether a TO-92 package IC to a PCB - as shown in figure below. The cable length would be less than 50mm. Questions: How can I achieve CONN1 - i.e, attaching a cable (comprising of at ...
0
votes
1answer
134 views

How to program modules on assembled PCBs?

Suppose a Bluetooth module like the HC-05 is part of the PCB design. During production, how/when are the modules programmed? Is each programmed before or after assembly? If it happens after assembly, ...
7
votes
3answers
939 views

SMD Crystal solder(?) problem and any recommended test procedure

I use a 32.768 kHz SMD crystal (datasheet) for a MCU. Here is the layout part of the crystal. Here is a view from an actual PCB I mounted the components by hand-soldering, and produced about 30 ...
1
vote
1answer
85 views

I'm looking for a specific replacement PCB module connector [closed]

I wonder of anyone here may be able to help. I've been looking for some time now for a replacement for an old (c. 1980s or early 1990s) PCB module connector. I'm looking for anything similar in order ...
2
votes
1answer
149 views

From what pitch should I consider ENIG finish

My design (4-layer, FR4, 1.6mm) has a couple of ICs with 0.5mm pitch pads and some LEDs with 0.4mm pitch pads, very small LEDs. Should I consider ENIG (more expensive) or will HASL do the job? I read ...
1
vote
0answers
95 views

BOM/OPL parts help before PCB fab

I am completing my first official PCB project. I am outsourcing the PCB fab to Seeeed Studio. I was wondering if any of you might be able to shed some light on my issue. I am using their PCB ...
1
vote
1answer
78 views

SMT reel: taking a couple of parts off the reel

I have a couple of SMT parts that I ordered "digireels" for - i.e., essentially tapes wound around a spool, with some leader tape attached at the front. This is good for the pick and place machine - ...
17
votes
3answers
2k views

What are the 'knuckles' on through-hole LEDs and photodiodes for?

I am using an IR LED and a photo diode, and I have designed the PCB according to the specifications that I found on the datasheet - i.e. hole sizes for the pins being 0.6 mm. However, on these ...
0
votes
2answers
53 views

Can I mount LTC6102 on breadboard?

LTC6102 is a shunt resistor current sensor with the following datasheet: http://cds.linear.com/docs/en/datasheet/6102fe.pdf The package Description has come on page 24. If everything is in mm, then ...
2
votes
1answer
184 views

Should PCBs be rinsed after being cleaned with IPA?

A lot of people recommend using 99% IPA to clean flux (and other stuff) off PCBs. I haven't been rinsing off boards after cleaning with IPA as to my knowledge it's not corrosive, but I'd like to hear ...
0
votes
1answer
54 views

Who is responsible for panelizing solder paste layers?

When creating small PCBs, it is often convenient to panelize them for higher volume production. In my package of gerber files, I include all the layers for one image, and then include a PDF detailing ...
1
vote
0answers
119 views

fiducials on a panel

have a little question about fiducials: My Layouter/My Boss likes to use 3 fiducials on the panelframe and one fiducial on each individual board in the panel. My job is to build the program for the ...
1
vote
2answers
97 views

Suitable FFC socket for this LCD module

I've ordered this LCD module, and I'm trying to find a suitable connector for it. It's 26 pins with pitch of 0.8mm, but as you can see, the right hand side is "sticking out" of the connector. Is this ...
0
votes
1answer
255 views

Maximum protusion length for through-hole component pins

I'm working on a PCB that has through-hole components on both sides of the board. The "top" side of the board is mounted flush to a Delrin plastic block (the only top-side component is a gas sensor ...
4
votes
1answer
2k views

How to generate Assembly drawing in Altium

How to generate Assembly drawing with designators inside the boxes like this in Altium? Is it by placing designators (silkscreens) inside manually? I guess not.