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.

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30 views

Shrinking drill hole size in Eagle

The last time I did a successful PCB, the drill hole size relative to the component pad size is rather huge to the point where when I entered the soldering stage, the component wires were not ...
0
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1answer
50 views

Choosing a via for automated PCB assembly order

Apologies if this has been asked before - I'm new to the field, and to Stackexchange EE - so route me to relevant posts if some exist. I'm aiming to order PCB assembly from a manufacturer (i.e. both ...
2
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1answer
55 views

Searching for exotic SOT23 P-channel mosfet where source drain swapped

Due to an error in the layouting process a batch of PCBs has to be scrapped. Instead of the standard pin assignments: 1 - Gate 2 - Source 3 - Drain we used: 1 - Gate 2 - Drain 3 - Source As a ...
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0answers
59 views

How to find the customer [on hold]

We are a big pcb & pcb assembly factory. I am new in this market. But hard to find the customer. is there anyone have good ideal for it?
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0answers
12 views

CNC 2020B - CNC USB Controller Setting File [on hold]

I'm trying to configure this CNC 2020B machine to work with CNC USB Controller and with first run I managed to get tiny board printed from Gerber file, so my first mistake was using mm instead of ...
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1answer
54 views

TSOP-54 Adapter for prototyping

I am using an ARM M based development board (1) from TI. I wish to extend RAM (from default 256KB to 256 KB+ 8MB)by following the provided reference design (2). The design uses an ISSI DRAM ...
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2answers
59 views

Connecting AC wires to aluminium PCB

How do I connect AC wires to the aluminium PCB pads? Is it safe for user?
3
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1answer
54 views

How do you specify orientation of devices during PCB assembly

Generally when I build stuff on a PCB I create a small legend with a circle for pin 1 and I use this to manually orient the IC. I was watching a couple of youtube videos on automated pick and place ...
7
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1answer
131 views

How practical are these land patterns for connecting components in a SMPS?

Was reading this app note from Linear Technology: PCB Layout Considerations for Non-Isolated Switching Power Supplies and on page 7, there is the following image. Are the desired connections ...
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2answers
82 views

Help in identifing these 2 materials

i would like to know if anyone of you recognize these 2 materials and what they are used for ? A material sticky on one side normal on the other , used between capacitors and aluminum enclosure . ...
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1answer
66 views

General rules to define a part for BOM and Assembly files.

I would like to know if there are some standards or rules to describe parts when generating the BOM or assembly files for manufacturing. For example, I would describe an SMD capacitor with format ...
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1answer
48 views

Electrical Part on Connector Board ME302C for Asus Memo Pad

I have some unusual question: does someone know [![Part1][1]][1] what kind of electrical part is on that pcb (encircled)? This is a connector board (ME302C) for ASUS MEMO PAD. The part is ...
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2answers
108 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
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6answers
654 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 ...
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0answers
107 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
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1answer
85 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 (820µH, 986mA pk) with a 744139 WE-SI inductor (1.124mH, 3A pk). It works ...
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2answers
18 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 ...
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2answers
85 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 ...
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1answer
52 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
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1answer
83 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 ...
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1answer
114 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
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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
360 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 ...
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3answers
58 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 ...
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1answer
51 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
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2answers
136 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 ...
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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 ...
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0answers
41 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 ...
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0answers
59 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
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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. ...
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1answer
100 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
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1answer
97 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
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1answer
142 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
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2answers
304 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 ...
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1answer
126 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
108 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 ...
4
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 ...
2
votes
2answers
87 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
748 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. ...
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4answers
344 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
93 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 ...
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3answers
175 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
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1answer
227 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
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1answer
160 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
440 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
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0answers
66 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
244 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
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1answer
155 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
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1answer
139 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
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3answers
974 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 ...