All Questions
Tagged with pcb-assembly pcb-design
173
questions
0
votes
2
answers
85
views
What is the best solution to keeping heavier components on a double-sided PCB while going through second pass reflow?
I am trying to do some research as I have many customers who face this issue with their parts falling off the board during the second pass. What has worked for you? Many applications are different ...
- 1
4
votes
6
answers
940
views
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 ...
- 41
0
votes
2
answers
86
views
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 ...
- 145
0
votes
2
answers
59
views
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 ...
- 11
1
vote
1
answer
96
views
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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0
votes
1
answer
30
views
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 ...
- 100
0
votes
0
answers
24
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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 ...
0
votes
0
answers
63
views
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. ...
- 1
0
votes
0
answers
43
views
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 ...
- 25
1
vote
0
answers
71
views
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 ...
- 737
0
votes
0
answers
57
views
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 ...
- 11
0
votes
1
answer
167
views
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 ...
- 41
0
votes
1
answer
92
views
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 ...
- 41
5
votes
4
answers
2k
views
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 ...
- 7,159
0
votes
2
answers
113
views
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 ...
- 193
0
votes
2
answers
95
views
Why are some components missing areas of pour near mounting holes?
Circled in red are component through holes in a copper pour plane that are missing areas / don't have the copper poured completely around the via. Seen on tons of components both through hole and ...
user298907
0
votes
1
answer
50
views
How to connect a removable multipolar signal flat cable to PCB
Wich is the best and easy way to connect this kind of cable to a PCB in a manner that it can be attached or removed to and from the PCB?
- 359
11
votes
5
answers
3k
views
Are these tracks too close for comfort, will this distance cause any problems?
I'm doing some PCB wiring and I am connecting many buttons to an Arduino Mega's digital inputs. The idea is that the digital pins will be normally high and when I push one of the buttons, the digital ...
- 125
0
votes
2
answers
268
views
PCB warping during Reflow
I have design a PCB size about 100x60mm it reflow very nice on the hot plate but If I convert my PCB to a panelization 2x3 quantities size became 200x180, the edges began to lift up due to expansion ...
- 1,139
1
vote
3
answers
155
views
Component/Footprint selection in EAGLE for PCB designing
I'm a beginner and I want to build a basic PCB using EAGLE software. I want to only use SMD components but I have few doubts while using EAGLE:
I want to design a PCB schematic by using standard ...
- 99
0
votes
0
answers
121
views
PN532 RFID Reader IC taking up 4mA even when there is no power applied
I have designed a custom PCB for one of my side projects. PN532 is interfaced with ESP32 over i2c. Goal is to have the system consume current in uAmps range when in deep sleep. I put ESP32 in deep ...
- 1
2
votes
2
answers
462
views
Need help figuring out circuit board design
I'm building a clock I found on Thingiverse. The designer created a custom PCB to connect three stepper motors, an Arduino Nano and some Hall sensors. Unfortunately there aren't many instructions. I'...
- 123
1
vote
1
answer
115
views
Do companies usualy change PCB layout if they create different versions for different markets? [closed]
I was wondering what's common practice.
If a company like Samsung for instance creates a phone for the international market (SM-G975F) and the Korean market (SM-G975N), and the Korean phone has some ...
- 133
1
vote
2
answers
162
views
Altium Variants In Bill Of Materials
Is there any way in Altium to display/combine the different Variant configurations in a single Excel sheet exported from the Bill of Materials, e.g. have the different variant configurations displayed ...
- 96
1
vote
0
answers
72
views
Flexible PCB design suggestion
I'm currently learning to design a PCB. For this board, I want to sense the current in two different ways (using either analog or digital current sensors). Each sensor requires a current sense ...
- 89
2
votes
1
answer
1k
views
Calculating minimum prepreg thickness to withstand high voltage difference between layers
I am considering doing a 4-layer PCB for a 3-phase system (400 V) for the first time (never done a high voltage board before).
Because of mechanical constraints, I want the board to be as thin as ...
- 131
1
vote
1
answer
178
views
PCB Silkscreen Marking
Today, I came on a PC board and the silkscreen marking have TG on it. What is the component for TG?
0
votes
2
answers
100
views
PCB Design on width
I would like to construct a 25A on board. How much mil or mm should I use for wire width? I have search for it size shown that 300mil/7.62mm for 10A.
0
votes
2
answers
562
views
How to predict costs for getting PCB assembled?
I have a PCB that I designed that has around 40 components (mostly resistors and capacitors) on a board that is 40 mm by 80 mm. I have the BOM, pick and place file, and gerber file. If I provide the ...
0
votes
1
answer
105
views
Placing components between DPAK IC pins
Is it accepted practice to place components between the pins of a DPAK IC like in this picture?
KiCad says "courtyard overlap" in the DRC, but this shouldn't be a problem, I think. During ...
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