Questions tagged [soldering]
Soldering is the metallurgic process used to fix electronic components to a PCB, usually with a tin alloy. Soldering can be done by hand or automatic. PTH boards were usually wave soldered, SMT uses reflow technology.
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I'm having trouble figuring out which wire should be soldered where
I can't figure out which wire I need to solder to which part of the board. I can't find a schematic for this device anywhere. Тhe device is a Parrot MKI9100. This is the display cable.
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How should I wire my circuit onto a perfboard?
I have built this circuit on a solderless breadboard, and now I want to build a permanent version. I have all the parts, I want to build it today.
How should I put this on a perfboard?
Note that I am ...
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Soldering paste for SMD on a laptop motherboard
I want replace a SOIC8 SMD EEPROM on my laptop's motherboard. I have both a hot air gun and a soldering iron.
I bought tin-bismuth soldering paste (Tin 42% - Bismuth 58%), but then I saw on most SMD ...
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Need suggestion to replace the thermal fuse of a heater
I got a mal-functioned heater from a community group. After diagnosis, I found one of the thermal fuse was blown. I got the replacement fuse and now face the question of how to replace it.
The ...
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Proper Procedure for Extracting MQ Sensors from Breakout Boards
I'm working on a sensor array project using MQ-2,3,4,5,6,8, and 135 sensors. The bulky breakout boards would unnecessarily increase the PCB size, and purchasing bare sensors is not a cost-effective ...
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Identifying a socket contact - and finding a slightly larger size
I have this socket contact:
(The image of the pin terminal to the right in only for size reference).
I have identified this socket contact as ...
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How old is too old for BGA chips soldering
I need to buy a batch of UFGBA100 STM32 MCUs from a Chinese broker. I'm concerned that in the quote they specified that the chips will have a date code 19+ (4 years old). How can this affect ...
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Replacing tact switches on MPC2000xl. Need help with one not responsive
I have replaced 40 small tact switches on my MPC2000xl four of which were not responsive. After some cleaning and desoldering I was able to get 3 working again. The last one has a burned contact pad ...
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What’s the difference between soldering iron wire wools?
What is the difference between the two different coloured wire wools for cleaning soldering iron tips?
Both are being sold online by many sellers and both claim to be made from copper.
Is one better ...
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Tips for soldering some wires into a PCB
I need to solder some wires into a PCB, im dont really master soldering small pads or pins, so i need some help.
I have a question too, those pads are already tinned, soldered, so can i apply some ...
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Identifying a connection terminal specification from photo
I'm having difficulty identifying the 12 pin connection as seen in the photos below.
It appears to be a JST, but upon purchasing some 12 pin JSTs, they do not fit and are too big.
Is there a way to ...
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Lifting Pins on SMT RJ45 Connector
I'm running into an issue with a specific RJ45 SMT connector where the I'm getting at least 1 pin lifting on >50% of the boards that run through our reflow oven. The rest of the components on the ...
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How much current should a switching regulator consume on its own?
With your help on stack exchange, I finally finished assembling my first LM5143QRHARQ1-based buck converter! And it works! It does output 7V (well 7.03V) The only problem is that it consumes around 0....
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What kind of soldering material is this?
I just saw a video of this gray goo that basically auto-solders small electronic components. I was wondering what this is, and where I can get some.
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Suitable intermetallic compound (IMC) thickness for solder joint
What is the suitable/recommended thickness for initial IMC layer formation right after the soldering stage without any thermal cyclic tests?
I came across this system while diving into this topic:
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Do annular rings have any influence on the solder barrel fill?
Does the annular ring size on PCB has any impact on the level of solder barrel filling for wave soldering? I've came across some articles about annular rings affecting the plating on the hole, just to ...
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Tips for soldering a through hole GPIO hole onto solder pads
I want to solder like this:
And here's the image source: https://sudomod.com/mintypi-custom-parts-guide/
Basically, I want to solder something with GPIO holes onto another board without using GPIO ...
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Capacitor Operating Temperature Range
Our .0047uF G 630 Vdc axial cap has an operating range of -40C - +85C. If the wave solder temp reaches 105C won't the cap be damaged, or possibly have an altered tolerance range?
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What is the purpose of Solder Bridge?
I am learning about STM32 controller now.
While learning I gone through the datasheet of STM32F429 display board in that board it has solder bridge.
I don't know what is the purpose of that. Can ...
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How can a resonance circuit work as a current amplifier?
I have been working on current amplifiers for my RF circuit. I was thinking about pre-amplifying the current by a tank circuit. The input of the circuit is just a mp3 player, which has not much ...
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Reflow soldering with decreased footprint size fully within pad
So the original footprint is first, followed is the edited footprint to allow for inner pads to be accessed.
As you will notice the extended pad footprint is smaller than the pad. Will this cause ...
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Where is the "flux in core" inside soldering wire? How does it change the soldering wire vs the pure element?
I was looking into soldering wires. I found out that even when soldering wires are, for example 60% Tin and 40% lead, the wires contain 2-5% flux. Even "pure tin" soldering wire contains 2-5%...
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How do PCB manufacturers prevent solder from entering vias during wave soldering?
I have some PCBs that were wave soldered but the vias still remain open, they are not filled nor plugged form what I can see. I do not see any solder on the annular rings of the vias either.
How do ...
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How is this USB connector supposed to be soldered
I'm using this USB-C connector in a project but could not figure out how it should be soldered to the PCB. I could not figure it out from the datasheet either. It says it is an SMT component - does ...
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Repairing Damaged Via & Pad
I have damaged a via and the pads that sit on top of that through-hole. Looking at the underside of the PCB, I believe I could just add a single copper wire on the underside and connect it to D69, ...
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How to remove glued IC chip from PCB?
I used rework station hot air to 360 degrees Celsius for 3 minutes and the IC didn't come off! I hope I didn't damage it for prolonged heat exposure. Then I found out the IC is glued, I couldn't find ...
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Why my soldering iron tip dissolved?
I have used 25 watt tip on 25 watt soldering iron a month ago and within a month there is a huge hole in my needle tip(attaching photos). It seems like something had dissolved it. Both of tip and ...
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How to resolder the wires to these two switches?
These two stuffed animals no longer light up. I opened them both up and found that one of the wires to each of their on/off button switches has broken off entirely. All other parts seem to be intact. ...
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USB-C PD Smartphone
My scenario: USB-C 5V smartphone charger is connected via USB-C cable to an breakout board. Both breakout boards are soldered together (All A Pins to A and all B to B). So basically I only extended ...
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Soldering iron vs hot air gun
I have always used soldering irons of various types. My current one is Hakko FX-888D. I would like to buy a higher-power tool for more bulky work (like soldering banana plugs). So looking for ...
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Create pads to solder in
I am designing a circuit in Kicad.
The emitter of the BJT should become connected to a speaker.
The other end of the speaker should be connected to GND.
My plan is to have the speaker NOT soldered on ...
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How to test Raspberry Pi Pico after soldering header pins?
I just got my first Raspberry Pi Pico and I don't have any experience in electrical enginering.
The book I'm following indicates that I first have to solder the and the first step is to solder the ...
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How to solder stainless steel electrode to PCB pad?
My goal is to solder stainless steel electrodes to a PCB in order to make a device that can measure differential voltage measurements from a surface.
How do I attach stainless steel to a PCB to create ...
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Soldering ground plane top vs bottom
I have a board that uses ground and vcc planes. If ground plane is on top layer and vcc is on bottom, should I solder on top layer ground pins and keep seperate from bottom layer? Or could I solder ...
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Efficiently troubleshooting a circuit card [closed]
I will start off by explaining and giving some background. I cannot share any images of the circuit card in question because a security clearance is required to do so. I work in the US military fixing ...
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Solder SMT/SMD with a rework preheater?
Is it possible to solder SMT/SMD chips using a rework preheater (e.g. a Model 5040-XR3)? What "gotchas" go with this method of SMT/SMD soldering?
I know it's best to use a real reflow oven, ...
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Typical resistance of an SMD solder joint
Do you have an idea of the typical resistance between a PCB track and a SMD resistor pad? That is, the resistance of the solder on, for example, a 0402 resistor.
The idea behind my question is that I'...
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Why does my TS101 soldering iron turn on LEDs upon contact?
An LED on my board turn on and stays on when I touch it with my soldering iron and it's freaking me out. This happens even though the board is just sitting on my (wooden) desk and not connected to ...
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Molten plastic or resin over jumper terminals
I have a number of sensor boards on which I need to close two jumper connectors with solder. On the second board, my iron was not sufficiently hot and I made a mess of it. I've since replaced the iron....
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VL53L0X Assembly Soldering Problem
We have a product(PCB) in mass production as using VL53L0X.
There is a problem with some of our products.
We tested before sending customer. There is no problem. But, over time we have received ...
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Real Case Scenario of 60/40 Solder Debris in Home Reconstruction: Should I be Worried?
Everyone, I admit I might be getting a bit on the overthinking side, but after reading all that's available online on the matter, I am starting to get a bit worried.
I had my home renovated and (as I ...
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Shorting (connecting) two pads that are on opposite sides of the PCB
I have a PCB that has two rectangular pads on either side of the PCB, exactly opposite to each other. They need to be temporarily shorted (connected) to allow setting of some parameter through ...
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Trouble hand crafting a USB "bridge"
I am trying to pass a USB connection through a USB-controlled relay bank so that my computer can switch on and off whatever device is plugged in at the other end, past the relay bank.
At the moment, I ...
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Can I separate a LCD screen from the board?
I am using this 2x16 LCD
https://www.amazon.com/GeeekPi-Interface-Adapter-Backlight-Raspberry/dp/B086VVT4NH/
I am trying to make the LCD ultra slim to fit in my project. Can I dismantle 2x16 LCD and ...
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Solder bend radius or tension radius or wetting distance
If I had a solder (like lead free SAC305) and I wanted to calculate what the radius would be on a given amount of solder, how would I do that?
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Interaction between PCB surface finish (ENIG vs HASL), wave soldering, and manual final assembly
I am developing a PCBA that is (for me, an amateur) fairly complicated: 4 layers, double-sided, mixed SMT/THT assembly. It is a fairly dense layout with ~150 total components including all the ...
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Is this a cold solder joint and do LEDs dim if it is a cold solder?
Are the solders in blue cold solders or something else?
They are connected to LEDs and they are glowing dim now, but they used to glow bright when their wires were soldered properly.
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Reballing / Estimate size of solder balls for BGA-132 NAND chip with 1mm pitch and diameter of pads 0.3mm (Kingston FB64B08UCT1-0D)
For reballing, I need to estimate the size of original solder balls for the Kingston FB64B08UCT1-0D BGA-132 NAND chip coming from a Kingston ssdnow 256GB SSD, model RBU-SC180DS37/256GH.
Another SSD, ...
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ESD safe soldering without PE
I live in a very old house that has no PE in it, so I can't ground the tip of the iron and myself as I should to solder in a ESD safe way. Is there any method to improve ESD safety of soldering, when ...
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Can I solder two 12 VDC fans to one end of wires of single Molex connector?
I have 2 Sunon fans (12 V, 415/519 mA - max, 5.4 W/6.22 W - max). I want to solder both onto the end of a single Molex connector cable extension (bought from a local store).
Molex connectors all-4 ...
