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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1answer
76 views

How to make an electrical connection to thin gold plating?

Hello fellow engineers. I am trying to make an electrical connection with some gold plating. The gold plating is shaped like a rectangle, with dimensions of 3mm x 1.5mm x 0.1μm thick. Here is what ...
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4answers
83 views

Securing mod wires to PCB

I have done a few mods to a PCB with 36 gauge mod wire. Obviously this wire is so thin that it only takes a few bends back and forth to break it. What is the best way to secure this in place on the ...
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3answers
116 views

PCB design for 13A/12V Circuit

I am new to PCB design and am building a PCB circuit powered by a 2200mAH, 25C , 3S lipo battery, the maximum current that will be drawn from this would be 13 Amps. I usually use the trace ...
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7answers
2k views

Hand soldering SMD 1206 components [closed]

Because I tried to wire-solder a protoboard which failed miserable, I'm intending to order a PCB. However, to minimize the area, I want to use some SMD1206 components. I ordered some basic ones (...
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9answers
5k views

How to remove this component from PCB

Anyone have any idea how I could remove this component? I've tried blowing hot air, used solder wick, tried to poke the holes with two soldering irons, cut the pins to near the PCB, but it won't ...
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2answers
80 views

How to solder USB-A female socket to PCB?

Sorry I have tried many google searches but can't find anything directly relevant. A USB Type-A female socket, through-hole, right-angle PCB mount has small 45-degree bent pins for soldering the ...
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2answers
84 views

How important is it to track from centre of pad in PCB routing?

When reading through the review comments of a PCB, there was one which raised some questions for me: "Aim to route tracks out of pad centres and in line with the pad, not exiting at an angle." I ...
3
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1answer
73 views

A recommended way to check a transistor is not burned, without burning other PCB parts

This might seem a basic questions but I am relatively new to circuit implementations and working with PCBs. I suspect that one of my transistors is burned. I am using 2N3904. For example, is ...
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1answer
78 views

Clean vs no-clean flux for high voltage circuit

I have a board that has fairly high working voltages up to 100V with small clearances down to 12 mil between the high voltage and ground or low voltage nets. This is unavoidable because the whole ...
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1answer
55 views

Surface Mount Adapter PCB With Castellated Holes

I have some prototype boards that I would like to modify. The modification includes removing a section of circuit and replacing it with another circuit. My theory on how to do this is to make an ...
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0answers
46 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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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
30 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
100 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
48 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
954 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
100 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 ...
6
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1answer
185 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
68 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 ...
3
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4answers
558 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 ...
4
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2answers
463 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 ...
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1answer
152 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
103 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) ...
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1answer
66 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
93 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
60 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
105 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
85 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
114 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
221 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 ...
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4answers
367 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
93 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
140 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
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3answers
974 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
465 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
126 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. ...
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1answer
87 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 ...
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1answer
265 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
81 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
94 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
151 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
201 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
66 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
137 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
105 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?