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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.

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33 views

How to calculate stray capacitance on PCB

I use a 0.4mm spacing between PCB traces (including 0.4mm space between crystal pads and ground) and I believe that's causing stray capacitance. My circuit board is typical (1 ounce copper on FR4 ...
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0answers
65 views

Tight Space Pin Remapping for General IC Controller Socket Design (3d Printer Main Board) [on hold]

I'm currently contemplating a 3d printer main board design... I would like to minimize price and maximize reliability and re usability. Existing boards use a somewhat monolithic architecture; Usually ...
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8answers
2k views

How can I add “standoffs” to elevate a SMD component above the PCB?

I made a mistake when creating a symbol/footprint for a small (2.0 x 1.6 mm) SMD crystal and didn't notice until the prototypes didn't work. Unfortunately, the boards are tiny and expensive (0.4 mm ...
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0answers
27 views

Using board-to-board pins and crimp receptacles to attach a non-board receptacle to a board

I imagine this is a bit of a stretch, but I'm working through some iterations of a cable harness for a 3D printer. I've considered that a custom PCB may be in order (still on the fence there), but the ...
7
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1answer
87 views

How to remove kapton tape from soldered parts in bulk?

I have PCBs with SMT nuts (SMTSO2060MTJ) which has been assembled onto a PCB - the nut has kapton tape on top to allow easy pickup for assembly. However, removing the kapton post reflow is proving ...
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2answers
47 views

IC on Breadboard: I have a PCB IC (LTC3115), how to search if it's available for breadboard use?

I am designing a PCB and am using buckboost converter IC - LTC3115. I have tested the component on the PCB and am not getting the required voltage output. My idea is now to check if it will work on a ...
12
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1answer
949 views

Identify these wide ended tweezers

Working in an electronics lab, we do micro soldering and I came across the tool pictured. No Idea what it's is for. I'm guessing its some tool for holding or removing chips as you rework a PCB. I don'...
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1answer
75 views

Single key not working on DIY mechanical keyboard (xd75re PCB and Switch both work)

I have assembled my first mechanical keyboard using the xd75re PCB. I used a plate mount, and all of the switches were installed without issue (this PCB has hotswap). When I used keyboardtester.com to ...
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1answer
150 views

Connecting top and bottom SMD component pads using via

I am working on a 2 layer board and the PCB will be a double sided job. Some components on the top layer will have exact mirrors on the bottom right under them. My question is, for SMD components, can ...
2
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1answer
64 views

How to Indicate Bridged Solder Jumper for Production PCBA

If I would like to indicate to the PCBA manufacturer that a solder jumper position is to be "bridged" with a solder blob, what is the preferred way to indicate this? I have thought of the following ...
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4answers
547 views

Beyond what is recommended by fabricators, how far should traces be from SMD pads?

Having followed a fabricator's DRC (this case being OSHPark), this distance between an SMD pad and a trace is considered acceptable (see attached images). However, I wanted to inquire about what the ...
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2answers
444 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 ...
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0answers
18 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
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1answer
136 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 ...
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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 ...
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2answers
96 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
58 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 ...
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1answer
86 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 ...
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2answers
56 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
102 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
74 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 ...
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1answer
49 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 ...
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2answers
109 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
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1answer
214 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
329 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 ...
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0answers
75 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?
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1answer
130 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
962 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
441 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
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1answer
114 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
86 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
213 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 ...
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2answers
79 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". ...
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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 ...
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1answer
92 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
147 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 ...
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1answer
101 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
171 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 ...
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0answers
61 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 ...
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2answers
132 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??
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2answers
104 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
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1answer
376 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 ...
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0answers
132 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 ...
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1answer
179 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
313 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
104 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 ...
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2answers
167 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 ...
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2answers
123 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 ...
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3answers
187 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 ...
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2answers
171 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 ...