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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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1 answer
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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.
Putri's user avatar
  • 31
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1 answer
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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 ...
condor12's user avatar
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2 answers
35 views

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 ...
wimnat's user avatar
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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 ...
condor12's user avatar
  • 145
6 votes
4 answers
632 views

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 ...
Blup1980's user avatar
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2 answers
55 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 ...
Visioncoop's user avatar
1 vote
1 answer
89 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 ...
Visioncoop's user avatar
4 votes
4 answers
730 views

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 ...
mehmet's user avatar
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1 answer
29 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 ...
Never's user avatar
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5 votes
2 answers
66 views

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 ...
jak's user avatar
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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 ...
Cowboy_Patrick's user avatar
2 votes
3 answers
284 views

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 ...
Joe's user avatar
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1 vote
1 answer
45 views

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 ...
kando's user avatar
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1 answer
50 views

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. ...
Pravin's user avatar
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41 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 ...
Roy's user avatar
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1 vote
0 answers
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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 ...
Besi's user avatar
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1 answer
47 views

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....
Cal-linux's user avatar
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0 answers
56 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 ...
underflow's user avatar
0 votes
1 answer
124 views

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 ...
Electronx's user avatar
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1 answer
161 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 ...
Vagabond4761's user avatar
0 votes
1 answer
89 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 ...
Vagabond4761's user avatar
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 ...
John U's user avatar
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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 ...
Unicorn's user avatar
  • 193
2 votes
1 answer
134 views

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 ...
Kevin McQuown's user avatar
1 vote
1 answer
74 views

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 ...
StealthRT's user avatar
  • 773
11 votes
2 answers
927 views

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 ...
Kevin McQuown's user avatar
1 vote
0 answers
130 views

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 ...
Nick's user avatar
  • 113
4 votes
3 answers
677 views

Importance of copper balance when dealing with small components (0402, 0201)

I usually work with big components (0805, 0603.) Now I'm trying to make a board that would use much smaller packages such as 0402 and 0201. I know that balancing copper is relatively important to ...
BEN's user avatar
  • 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 ...
user avatar
1 vote
1 answer
136 views

Trying to ID small barrel component for replacement repair

I am trying to find a replacement part that goes on a PCB of an LED C size battery-driven hanging lantern light. One of the two leads of the small barrel shaped component corroded and broke off near ...
Stephen Zewe's user avatar
2 votes
0 answers
69 views

Can 5mm UV LEDs cure solder mask?

Is it possible to cure solder mask using about 32 5mm UV LEDs spread evenly above a PCB (10x15 cm). If yes, since they are weak, what would the cure time be? I want to make my own PCB mill and I want ...
Gabriel Stan's user avatar
0 votes
1 answer
49 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?
M4Biz's user avatar
  • 359
1 vote
2 answers
82 views

Identical component on both sides of PCB with vias in ground pad

I have a dual analog output PCBA that I am routing. The analog output component selected is two TI DAC7750IRHAR DACs. These DACs are controlled via SPI lines. I had originally intended to place both ...
rothloup's user avatar
  • 428
0 votes
1 answer
89 views

Soldering 2-Wire DC Motor directly to PCB

I'm making a PCB that's required to be pretty compact. In order to reduce overall size, I need to keep a 2-wire DC motor as close to a PCB as possible. It has standard tabs on the back, typically for ...
Vitaliy Sakun-Duvalko's user avatar
1 vote
2 answers
98 views

What files do you need for PCBA?

Just a quick one. It seems that for PCB manufacture, the industry-standard way to specify what you want is so-called “Gerber files”. If you want PCB assembly as well (i.e., loading components onto the ...
MathematicalOrchid's user avatar
3 votes
4 answers
1k views

Putting caps, resistors, etc on back side of board

Assuming I am ok with the extra cost of having parts assembled on the backside of my PCB, does it make sense to basically place all the main parts on the top side and then strategically place all the ...
Kevin McQuown's user avatar
1 vote
1 answer
99 views

Identifying an SMD component

It is related to the USB bus voltage in a Delta HMI that has been damaged. Is this a 2.4 V Zener diode? This component is marked with the letter D311 on the PCB.
Ashkan Khajeh's user avatar
1 vote
1 answer
57 views

How to add 2 or 3 parallel Li-ion cells to my custom PCB

I've tinkered with electronics and components for quite some time now, but I'm kind of a noob when it comes to taking things to "production". I've this project using an ESP12-E, powered by 2 ...
webnator's user avatar
0 votes
1 answer
57 views

PCB hybrid stackup

Have you seen or is it advisable to use TEFLON (PTFE) material between signal and ground layer and use an aluminum core material for better heat dissipation? I am improving a 6 layer circuit board ...
Wu Eric's user avatar
  • 33
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 ...
Jazz Handy's user avatar
0 votes
2 answers
231 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 ...
mehmet's user avatar
  • 1,139
0 votes
0 answers
39 views

Could 94-HB board be used for SMD and THT soldering?

I have a circuit that I designed lately which is quite simple based on just 1 opamp and have an SMD and THT components (like a relay) and will be producing mass production in Chinese factories and it ...
Hazardous Voltage's user avatar
0 votes
0 answers
70 views

SMD button not in jlcpcb BOM

I want to try the jlcpcb assembly service. I created the BOM, by using the bom2grouped_csv_jlcpcb. I inspected the generated file and indeed all the SMD components ...
user1584421's user avatar
  • 1,369
0 votes
0 answers
267 views

Replacement IC for SGM2212 LDO Regulator

I'm looking for a suitable replacement IC for the SGM2212-3.3XKC3G/TR found in this schematic. I've found this, which seems to be very similar and suitable for this application, but I'd like if ...
SurrealCereal's user avatar
1 vote
3 answers
134 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 ...
Ashish1313's user avatar
0 votes
0 answers
114 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 ...
Hamza's user avatar
  • 1
2 votes
2 answers
458 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'...
yhax's user avatar
  • 123
5 votes
3 answers
1k views

Is it feasible to put solder mask cured on the top of tinned pads?

I made a batch of PCBs with a QFN package IC. I accidentally connected the pad to GND even though it should be either left floating or connected to some signals else. I am glad that I have requested a ...
ONLYA's user avatar
  • 165
7 votes
3 answers
1k views

Excessive brown flux post reflow

I've been assembling low numbers of reasonably complicated PCBs professionally for a few years now, and while I can get good results eventually, one thing that's dragging the process out is the need ...
LordTeddy's user avatar
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