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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Unknown SMD component - PCB Designation question
I have a board we are trying to repair. We are unable to get any technical documents from the manufacturer, no schematic or BOM for the board. This has multiple switches, think metal dome you press ...
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Attaching foam to the bottom of a PCB
I'm currently designing some development boards that are quite large, around 100x180mm, with lots of through-hole components. The goal is to create an educational tool for students. Because of this, I ...
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Identify 5 pin smd marked "KV.." from motherboard led tv Panasonic
Identify 5 pin smd from motherboard led tv Panasonic that burned.
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What is the best way to adapt a larger connector when the insertion holes on the PCB do not match?
Good day, everyone. I have a Type-C connector on a device that is much larger than the micro USB connector I had previously. The insertion legs do not align with the holes on the PCB, and since it is ...
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Reattaching DC power adapter jack to PCB
Recently, my baby monitor stopped charging - that is to say, when I inserted the DC power cord, I had to wiggle the plug about in the socket a bit to get in to start charging and even then it was ...
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Is it possible to create new footprints and integrate additional components into an already manufactured PCB?
What is the most effective method to do so? I have enameled wire, which seems safer to me due to the insulation. My plan is to cover them with solder mask. However, I have a question: Would it be ...
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STM32F4 TQFP100 part orientation
I have mounted a STM32F446VETx on my PCB as shown on a picture of my PCB:
For me the pin 1 marker in the big mark at the top right of the picture, near C67.
But, after a lot of trial, I can't connect ...
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What is the best solution for wire to board then board to board connection?
Background: Hello, I am a first timer trying to finish this pcb redesign. I am in dire need as an intern who has no clue what they are doing but is having fun learning
I have all my schematics working ...
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Any idea how to stack two PCBs that can work independently
This is my first time ever doing PCB stuff :D
I have two L-shaped PCBs that will stack on top of each other. The connectors would stack on each other so that it can either:
Be used with both top and ...
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Are there any techniques for soldering USB-C 16 pin?
I am trying to solder Type-C SMD USB connectors but I can't do it properly. Despite using an SMT stencil for soldering, each time I am having an issue and I can not solder it properly. Sometimes pins ...
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Can I treat the thermal shock test temperature as the continuous operating temperature of a conformal coating?
We are using this conformal coating on our design, HumiSeal 1B73EPA.
However, it does not state in the datasheet the continuous operating temperature for the coating, only the thermal shock test ...
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Any software for helping hand place components by listing 'by group'? i.e. all 10k resistors so they can be placed at one time
Sorry for the convoluted title but what software do people use when placing physical components on PCB's?
Looking for something to highlight all 10k resistors or 1nF capacitors as examples to speed ...
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CJMCU-3652 resistor dimensioning
I bought a CJMCU-3652. It is based upon the LT3652 from Linear Technologies. In the datasheet on page 15 there is a description on how to calculate the resistors to properly
charge whatever battery ...
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Using TO-92 package for high voltage applications
I'm looking to build a high voltage (but low current) current source and I see transistors rated at 500V in a TO-92 package. The leads aren't even bent so spaced 50mils/1.27mm apart, and when ...
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Acceptable: Polygon/zone over surface-mount (SMT) pads?
Will placing a copper polygon/zone over multiple (same-net) surface-mount (SMT) pin-pads create any thermal issues with the solder (for example, paste not sufficiently heating up)?
The solder mask ...
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Are the diodes and capacitors oriented correctly in this motor driver PCB? TMC2209 stepper motor driver
If the polarity of both diodes and both caps look right, the driver IC probably smoked because of my solder job.
Datasheet:
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How do they make PCB with 0.2mm tracks? [duplicate]
I want to understand how do they make PCBs with 0.2mm tracks. I have built PCB using screen printing process. As screen print requires 0.5mm minimum track thickness, I need to keep track wider. ...
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2D mapping of PDB Layout in Allegro
I am trying to export a 2D drawing of my pcb layout in allegro. I would like the layout to include the components and their reference designators. However, I cannot find a way to do so and the ...
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PCB Layout review: ESP-07 with 28BYJ-48 Stepper board
I have used the 28BYJ-48 in conjunction with an ESP8266 in some applications and I thought it would be handy to have pcb made. I want to use JLCPCB including Pick and Place.
The Kicad source code is ...
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Footprint pads for an RF chip in QFN package
We are working on a design that uses the Analog Devices HMC321A. The datasheet does not specify a recommended footprint; they do specify the IC dimensions. The pins/pads on the chip have a nominal 0....
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How to solder a 5.5x2.1 DC plug to a PCB?
I am looking at mounting a DC plug on the side of my PCB board.
Unfortunately, only jacks exists for purpose of PCB mounting, and there are no mountable plugs produced.
(if they existed, they would ...
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What should be the minimum number of SMD components on a reel (minimum tape length) for a pick and place machine?
What should be the minimum number of SMD components on a reel for a pick and place machine? Different scenarios are possible for each machine. In terms of professional machines, if everyone writes ...
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PCB design - Routing without a schematic
I am using Altium CircuitMaker to design a PCB. I'm wondering if there's a way to make my PCB design without a schematic.
My idea is to simply make a PCB with just pads and populate it myself with the ...
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PCB Design Process
I'm new to PCB Design so I wanted to clarify a few things about the process.
For context, I have already physically made my project on a breadboard. Now I am trying to lay it out on a PCB.
I have ...
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How do you align parallel connectors (e.g. Raspberry Pi CM4) in production?
Apologies if this seems like a duplicate of this question but the eventual "answer" to that seemed somewhat anecdotal at best - and there's been a LOT more of these used since 2012 so things ...
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Is pad against pad enough for a good connection?
I have two PCBs that I need to connect together with holes or notched pins that I have to solder by hand.
In order to reduce soldering time, I've placed a few 2mm square pads on the bottom PCB and I'm ...
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Production quality issue?
I had 5 two-layer boards fabricated by a popular assembly house in China and I'm curious what folks thoughts are based on what I received.
Here is a photo of the 5 boards which has a red square around ...
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Diode and bipolar NPN transistors orientation not correct, says JLCPCB
JLCPCB is telling me 4 components are incorrect but when I look over it and the datasheet it all seems correct to me.
My original | JLCPCB corrected:
This is what my current board looks like:
My ...
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Supplier advising age of 74HC173 SOIC parts
I put in an order for 50 Nexperia 74HC173D,652 with JLCPCB for some kits I'm having built and assembled by them. These are going into electronics kits that are sold to high schoolers as part of a ...
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Is this USB C connector with tight pads too risky to use?
I'm intending to use the following vertical USB C connector because the long board overhang fits requirements, but the footprint causes some concern, not least because it seems to violate JLCPCB ...
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