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Questions tagged [pcb-assembly]

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.

4
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2answers
405 views

PCB - Ram connectors problem

Currently following an schematic for NanoPI NEO4 to make my own RK3399 board. On their schematic for the K4B4G1646D-BCK0,I noticed for pins DQ1-DQ15 on both chips connect to a randomised list of ...
0
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0answers
11 views

What do I need to add/remove when changing from a external to internal antenna?

Currently using the nanopi NEO4 schematic to make my own pcb. In their design for wifi/bt they use the F89ETSM13-W2, they connect to a 12pF capacitor and then to a IPX connector for external 2.4GHz ...
6
votes
1answer
106 views

Can you tell me more about “re-enterable” potting compound?

I heard the term "re-enterable potting compound", which is a gel-like (possibly hard?) material that can be used to fill electronics enclosures for water intrusion protection and other things. What ...
8
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2answers
1k views

Double-sided Assembly

I'm going to assemble a prototype PCB which have components on both sides. I have access to a reflow oven with profiling control, solder paste and stencils (from OSH-Park) In the reflow process for ...
7
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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
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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 ...
2
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1answer
72 views

Major causes for routing cut residues on a PCB board and how to prevent it

I am not sure if it is the appropriate to post this question here. I have a question regarding PCB SMT process. We found some PCB board after de-paneling using router cut, some of its residues being ...
0
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2answers
49 views

How to automatically assemble lithium polymer battery?

I'm redesigning a product for automatic assembly (DFA / DFX). The current product includes a lithium polymer battery with solderable leads, very similar to this: Right now the leads are hand-...
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1answer
100 views

What kind of part is this?

What kind of part on the board below? Or it's a part of another part?
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0answers
65 views

Wire connector with hole only large enough for the conductor and not the insulation jacket

I am trying to find a connector for a PCB that has an aperture sized to allow only the conductor to pass through and not the insulation jacket. I found a drawing here, see part B of drawing below ...
0
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1answer
46 views

Any suggestions to solve shielded jumpers between different PCBs? [closed]

I've a problem where I got one PCB and then another and I need to get some small power, ground and signals from the other PCB to the other one. The power and signals will also need shielding and good ...
2
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2answers
92 views

Putting GND on POWER layer

I have a four layer PCB, with a traditional: signal layer, power layer, ground layer and final signal layer. Due to the set up with the power rails, there are some large spaces on the power plane ...
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 ...
4
votes
4answers
218 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 ...
0
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0answers
56 views

Are there blank prototype PCBs with staggered edges for a DB25 connector?

Are there blank prototype PCB boards I can buy that will accept a solderable DB25 with its staggered pins?
2
votes
1answer
103 views

Coplanar PCB interconnect solutions - As cheap as possible

TLDR: Hardware design Newbie is lost in the jungle of options. Base Problem: I am designing a set of PCBs that are supposed to fit into a square grid pattern and be recombined in different ...
5
votes
3answers
928 views

What kind of breadboard and prototyping board do I need for this right-angle DB25 connector?

What kind of breadboard and prototyping board do I need to fit this right-angle DB25 connector? I'm new to soldering and don't know what the standards are. Additional information on this subject ...
6
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1answer
364 views

Rule of thumb for surface tension when placing components on the secondary side of a board

I've been working on my first multi-layer PCB design, and have been placing a variety of components on the secondary side of the board (mostly decoupling capacitors and QFN ICs). However, some of ...
5
votes
1answer
84 views

How to mount pcb with IEC320-C14 power entry connector inside enclosure

I am making a PCB which has one IEC320-C14 and one IEC320-C13 connector on it (Like this one). The PCB will be quite small, just large enough for some sensing circuitry; between 5 and 8 square inches. ...
1
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1answer
82 views

Why is the Image Sensor Board routing different?

The below posted is a open source camera project Elphel PCB layout images I have took their 353 model camera, which is mounted with an Onsemi sensor I only know that for high speed signals we go ...
2
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1answer
141 views

PCB Design Verification

I have been designing and prototyping a PCB for the last couple of months. I'm at the point where I'm extensively testing these boards before going into production. I have come across multiple ...
0
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2answers
73 views

Opening micro-controller package with vacuum pen

So I recently bought an STM32H7 chip to use for my undergrad final year project. The chip comes in a package with a label saying: "Fragile, vacuum pen must be used to remove this device". ...
3
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4answers
1k views

Keeping SMD parts in place while soldering with paste and heat

I was very happy to learn that I could solder SMD parts in place, by dabbing dots of solder paste on all the pads, placing my parts, and heating. I've done it using a modified toaster oven, or ...
0
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1answer
88 views

Can a Nintendo 3DS battery be used to power a pcb? [closed]

I just bought a power bank pcb for a diy project I'm planning. The PCB requires a lithium ion battery with 3.7 volts as input. The power bank then outputs 5v to 2 other PCBs. Can I use any Li-ion ...
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3answers
86 views

Is it possible to PCBA without a Gerber file & BOM

I have a designer designing the Gerber and generating the BOM from a logic design.I have half the information like the circuit drawings and circuit working. He says he will complete the gerber and ...
-1
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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?
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2answers
119 views

How to mount component perpendiculary to PCB

I'm designing small PCB(20mm*20mm) where I'm also limited by height of whole project that can't exceed 20mm. I have to place few sensors on the edge of the PCB but not facing up but facing out of the ...
3
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0answers
53 views

Remove IC Markings [duplicate]

We are shooting 9,000 boards a month in China, and want to remove the markings on several keys ICs so our competitors don't know what parts we are using. I spoke with our IC manufacturers and for ...
3
votes
2answers
118 views

Pcb Colour and AOI equipment

Can anybody tell me whether the colour of the Solder Resist on a PCB makes any difference when using AOI equipment to recognise the components placed on it??
0
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2answers
102 views

Assembling PCB - C and R holes are touching

Silly question. I am assembling a PCB. The holes for R3 and C29 (center right) are touching each other. Is this correct?
5
votes
1answer
302 views

smd orientation for pick and place

I am trying to confirm the right orientation for all the packages I am using in Eagle before sending for pick and place assembly. After reading a bit, I understand that there is no standard from one ...
0
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0answers
104 views

How long can the leads protrude for a typical selective solder machine?

I have an LCD who's leads extend about 10mm past the board surface. Can a typical selective solder machine fountain reach this high? If not, any suggestions on the best way to handle long ...
1
vote
1answer
149 views

assembling PCB, Cx is shown within IC outline - does this mean Cx goes on other side?

Embarrassing question. I am assembling a PCB. Please see attached picture. C9 is within the boundry of IC3. Does this mean that C9 is installed on the other side of the board? C9 = 100n X7R
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0answers
253 views

Most cost effective 6 layer stack setup?

I've been trying to come up with a 6 layer PCB layout with microvias. But I cannot think of a cost optimized layer stack, because every manufacturer seems to tell me something different on their ...
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0answers
102 views

Assemble a 9 * 9 * 0.05 mm steel foil and castellation PCB using standard pick and place

I have a hybrid PCB where I want to assemble a very thin steel foil on a PCB using standard pick and place SMT process. the picture below describe how the foil is like: The orange area is only hold ...
1
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2answers
152 views

Damages to ICs done when cleaning boards with IPA

I have designed a PCB and soldered some SMD components on to it. When I check it, it doesn't seem to work. It was my very first SMD soldering experience and I think I used too much hot air. While ...
0
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2answers
119 views

probable cause of damage to small SMD part: ESD, heat, something else?

The part in question is a 2 x 2 mm LGA accelerometer. 1. First soldering scenario, 10% non working parts after the assembly: no ESD protection gear hot air gun smoothly brought near / away from ...
2
votes
3answers
179 views

Economical way of manufacturing PCBs [closed]

I am developing a new open source device which consists of several functionalities. My plan is to get it printed from a PCB manufacturing company and get it assembled from the same company. I have ...
1
vote
2answers
135 views

Turnkey Vs Kitted Assembly

So I had some question about the differences between Turnkey (they supply the parts) and kitted (I supply the parts) PCB assembly. When I am making a batch of about 500-1000 PCB's, which option is ...
0
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2answers
151 views

Automatic SMT Line PCB Soldering [closed]

I am planning to create few circuit boards. I am considering getting the PCB printed from a manufacturer and do the SMT via a machine my self. Do you think it is good idea. The reason i an planning ...
4
votes
1answer
238 views

What is “Solder Soaking”?

I am reading "Advanced Thermal Management Solutions on PCBs for High Power Applications": https://ats.net/wp-content/uploads/2014/04/Advanced-Thermal-Management-Solutions-on-PCBs-for-High-Power-...
2
votes
2answers
232 views

How is this kind of soldering done?

The solder fillets around the base of the header pins are almost flat - very different from the kind of fillets you'd expect to around a 0.1" header. These kind of fillets are very common on ST's ...
7
votes
1answer
2k views

50Ω Impedance Matching with Signals Through Vias

I'm working on an IoT board and it is all laid out (LTE, GPS, BLE, WIFI - 30mm x 30mm -- VERY TIGHT). As a design concession, I have to use vias to route some of the RF signals. There's no other way ...
10
votes
2answers
1k views

Magnetic power connectors (ie. “dots”) for slim power supply connection

This may be more of a mechanical question, but does anyone know what these magnetic power connectors are called? You see these on Fitbits and other IoT devices. I'm building an IoT board, that has ...
9
votes
2answers
468 views

Actual Assembly Yields — 0402 vs. 0201 / 01005

I've been designing boards mainly using 0402s. I can hand solder 0402s all day with a microscope and some tweezers. Our passive supplier (a random Chinese passive company) has told us to get ready ...
2
votes
1answer
226 views

What's the proper track to learning PCB Design? [closed]

I am a Computer Science guy. But recently I became interested in designing PCBs. I have done a few designs on Eagle. But they are quite basic. I tried to move forward, but PCB design just seems to be ...
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 ...
0
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0answers
49 views

Placing a Chip on Glass LCD that has no breakout board on PCB

It is entirely possible that I may not have worded my question properly but I found this low power LCD(image below) for an oscilloscope project that I'm working on and I just wanted to know how I can ...
1
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2answers
242 views

Max acceptable resistance between IC ground and PCB ground plane

I tend to be very paranoid when it comes to making PCB's to the point where I try to use 50+ mil tracks for ground wires when routing the board. After, I fill the remaining space on the board with a ...
0
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2answers
79 views

Mounting a solderless tie point

I have an application where popping some solderless tie points on a PCB is a thing to to. I picked up some 1x4 tie points, https://www.elexp.com/ProductDetails.aspx?item_no=03TB-IVR&CatId= The ...