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 ...
- 11
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
views
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 ...
- 17
0
votes
2
answers
129
views
Clarifications about PCB assembly
I just finished designing my PCB, I printed it and assembled it. Everything seems to be working fine after some tests. However, assembling the load cells and power cables was really complicated and ...
- 7
0
votes
1
answer
128
views
SMD pad size for custom component
I'm trying to reflow a custom shaped strip onto a PCB, but I'm unsure about what size pad I need on the PCB.
The strip is 13mm x 6mm x 0.3mm.
The PCB surface finish is ENIG.
The pad is likely to be ...
- 133
0
votes
4
answers
193
views
Is there another component on the pcb that will extend the leg of the component?
In order to realize the event I mentioned in the picture below, I need an auxiliary component. Maybe a component where I can extend one of the holes 5 mm to the side. Or 5mm to 10mm dip adapter. Is ...
- 35
0
votes
1
answer
107
views
How to connect 2 (and more) PCBs together to make them semi-modular? [closed]
So, I want to design PCBs with some LEDs on them and connect them together. The PCBs are about 2 cm wide and connection has got to be on this sides of the PCBs. I've tried some connectors but ones I ...
- 13
0
votes
1
answer
63
views
2 Layer PCBA routing strategy for high current design
I have a very simple pcba design. The only thing of value is that the traces will carry up to 30A of current.
I have already decided to increase copper thickness to 2 oz for improved current capacity.
...
- 757
17
votes
5
answers
3k
views
Can extra long pads cause problems?
I am a hobbyist and I find it very difficult to solder and work with SMD components which have very small underneath pads. I can't see when the solder flows, I can't touch the pads with the multimeter,...
- 299
3
votes
1
answer
715
views
Will layer-to-layer leakage happen in a PCB?
I have a four-layer PCB that contains a circuit that measures voltage from a very high impedance node. This voltage is a DC voltage value ranges from 33 V to 36 V.
The voltage measurement circuitry is ...
- 2,593
3
votes
1
answer
82
views
Question regarding durability of wire to board contact
I am designing a board that has to carry up to 32 A of continuous current through it, and as such I need a cheap and compact method of permanently mating the 6 mm² wire to the PCB. Since I have very ...
- 111
0
votes
0
answers
246
views
Homemade double sided PCBs and soldering
I etched my own double sided PCBs (no plated through holes) and quickly realized that there will be an issue with making sure contacts on both sides of the board are making a proper connection with ...
- 511
0
votes
2
answers
99
views
Help in finding articles/research papers regarding materials used for designing small PCBs
I am currently working on an article for my internship on the topic of techniques for PCB design under space constraints. I am looking for the type of PCB materials that are used for manufacturing ...
2
votes
1
answer
140
views
How to outline traces in graphics
I've been searching online with no luck.
I'm using KiCad and I want to outline my traces with graphics similar to the image shown below. Is there a function within KiCad that does this or is this a ...
- 131
-1
votes
2
answers
182
views
What is wrong on this circuit? LDO Regulator TPS74401
I'm testing a board that I designed. I'm measuring all the input pins from LDO Regulator TPS74401, and all of them are ok (3.2 V). With my schematic configuration, the output should be 1.1V but the ...
- 400
0
votes
1
answer
182
views
JLCPCB Bom Detection from U
I am trying to order a PCB from JLCPCB and have the following problem:
When I enter the BOM in the Assembly it does not detect U1, all the other components are detected. What could be the mistake?
...
- 109
2
votes
0
answers
83
views
Have there been any significant industry-wide changes to PCB manufacture in the last several years (~2019-2021)? [closed]
Sorry for the naive question! I want it to be specific enough to be answerable, but I'm not sure how to find the answer to my actual question, so I'm asking it here. Another way to put it might be &...
- 137
3
votes
2
answers
1k
views
Solder bridge pad spacing and scratch trace width
To save cost on a board I'm designing, I'm considering replacing an 8x2 male pin header intended for jumpers (which previously replaced an 8-position DIP switch) with 8 pairs of rectangular solder ...
- 663
3
votes
2
answers
380
views
Can I leave a throughole pad off one side of a machine-fabricated PCB?
So I'm designing a two-layer PCB and I'm very inexperienced. A third-party company will fabricate them.
Now, I have a PTH part with a number of closely spaced pins (and there is no SMD equivalent of ...
- 663
0
votes
2
answers
1k
views
Soldering wire directly to a PCB through hole vias, what is acceptable proximity tolerance?
The wire gauge is 16 AWG. The hole size is 63 mil, and the overall via diameter is 98.5 mil.
What is the minimum spacing between two of these for voltage levels of 0-12V and 0-160V circuits?
I think I ...
user298907
8
votes
2
answers
3k
views
How do PCB manufacturers know how to orient polarized components?
Let's say I have diode or a polarized capacitor in my circuit.
How do PCB manufacturers know how to orient the part on the PCB?
When I create the part in Altium for example, I just make up which pin ...
- 868
0
votes
1
answer
2k
views
Thermal vias-in-pad - leave bottom side tented or exposed?
What is the suggestion for thermal vias under the exposed pad of ICs ? I understand that copper plugging would be ideal. But if I only have the choice of tenting or not tenting, should I leave the ...
- 22.5k
1
vote
2
answers
578
views
0805 package SMT pads minimum clearance and tombstoning
The picture shows 0805 LEDs and one last 0805 resistor connected to the GND pour.
What is the minimum clearance between the SMT pads of the different 0805 LEDs that I should consider safe for ...
- 333