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Questions tagged [soldering]

Soldering is the metallurgic process used to fix electronic components to a PCB. Soldering can be done by hand or automatic. PTH boards were usually wave soldered, SMT uses reflow technology.

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How to solder on a new USB plug/connector

I bought a USB WiFi card, but then the metal part broke and I had to take it off. I only have the board now and it is too small to fit into a USB port. Where can I find a new USB head/plug (the silver ...
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1answer
29 views

Nichrome pcb soldering

I want to know if it's possible soldering pcb using nichrome wire instead of lead. Specs say Nichrome wire melting point is around 1440 centigrade. Which is achievable with a tiny flame. Is there a ...
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1answer
31 views

Why is there a grounding clip on this solder sucker instead of a third prong on the plug?

As most of these inexpensive tools tend to omit the ground altogether (such as in soldering irons), why would ground be added as a clip instead of a third prong? Is there an advantage for it to be ...
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1answer
82 views

Is it OK that I solder inside my bedroom? [duplicate]

I'm hobbyist solderer using tin lead solder to occasionally repair broken electronics. As I don't solder all day every day, I use my normal writing desk in my bedroom, which stands next to my bed, for ...
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69 views

How powerful of a soldering iron do I need for this job

I am working on a 12"x 18" board that has multiple ground plane layers. I am trying to remove a through component that is tied to these ground planes. My 65 watt Hakko iron heats up the entire board ...
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1answer
71 views

When I rework an SMD capacitor or resistor, it will sometimes stick to the soldering tip. Does this high temp then destroy it?

When I rework 0402 capacitors, then often stick to the tip of the soldering iron. My iron is set at 350. I then discard the cap because I am worried the sustained temp for a few seconds has destroyed ...
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92 views

Converting a soldering station from 110 V to 220 V

i bought this soldering station from the USA and it is 110 V. I need it to be 220 V. Is this possible without external tools? There are 3 Trimpots: V1 VR1 VR2 This is the inside of the station:
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2answers
58 views

Soldering tab terminals without using holes

I cannot find any information about a practical problem I encounter. If we don't have crimping tools, when soldering wires to tab terminals with holes as below: Do we need to pass the wire through ...
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20 views

Can I use T12 soldering handle with 900M type soldering station?

I have a soldering station (sort of) Yihua 908D. I am not happy at all with it because of variable heating time and some other defects. However machine seems to be in order somewhat and I was ...
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42 views

Repairing DC Jack - What are all the things I'm doing wrong here?

I have a Lenovo Ideapad 110s as a beater, around the house laptop. It's a very low-spec computer, but I run Xubuntu on it and it does its job well. Several months ago, the positive pin connecting ...
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1answer
69 views

Can I use a 220v soldering iron on 110v? [closed]

I ordered a 110v soldering iron, but received one marked 220v 60w with a usa-compatible plug. If I plug into 110, will it still heat up?
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1answer
101 views

Can't find source of hum in left channel of bluetooth speaker that I built

I have an RN-52 bluetooth audio module - https://cdn.sparkfun.com/datasheets/Wireless/Bluetooth/rn-52-ds-1.1r.pdf I am using it with this amplifier - https://images-na.ssl-images-amazon.com/images/I/...
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1answer
59 views

Can I modify my 120v 30a soldering iron to be hotter? And how? [closed]

Not getting hot enough and solder melts real quick and rolls away.
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27 views

Damaged pads on PCB after trying to replace LEDs. How to repair? [migrated]

I'm replacing the SMD LEDs on my instrument gauge cluster in my truck with a new color LED. While attempting to remove one of the original LEDs, the solder pads came off from both the positive and ...
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2answers
61 views

Reworking WAGO 2060 on MCPCB

I have about 50 or so 1'x2' Al-clad MCPCBs, each with hundreds of LEDs attached. Each panel has 4x WAGO 2060 terminal blocks mounted at the corners. Unfortunately the WAGO connectors have sustained ...
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1answer
78 views

Worthwhile to create some 'building block' PCB instead of handsoldering?

I am still busy with my DMX splitter. The circuit is (at least for me as beginner) quite exhausting to hand-solder. See circuit below (sorry for my 'artwork' as some used to call it, it benefits me a ...
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1answer
65 views

What's that metal wounded filament sponge looking thing and what is it used for?

I'm new to soldering and ordered a cheap starter kit. It included this: I have no idea what this is. Any hint?
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1answer
42 views

Driving power + USB over cartridge connector [closed]

I hack old hardware (mostly microcomputers) by putting new insides in them, but I still consider myself a newbie when it comes to electrical engineering, so please bear with me, because this question ...
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1answer
57 views

How to prevent noninsulated wires close together during manual wiring a PCB?

Actually I have two problems, but this one is most annoying: I have like 10 wires I want to solder to the pins of a pin header (2.54 mm distance apart). Initially I kept like 5 mm of the end of each ...
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3answers
107 views

Can a resettable thermal fuse be soldered?

Earlier related questions: How to solder a 70 °C (158 °F) thermofuse Using a thermal fuse in a PCB terminal block? History: I 'normally' soldered a nonresettable thermal fuse, which (of course) ...
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1answer
56 views

Soldering double deck pin headers

Please take a look at a PCB like this one (STM32 Nucleo64 board): They utilized so called "double deck" or "stacked" headers, meaning they can be used from both sized (top and bottom). My question ...
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6k views

How to solder a 70 °C (158 °F) thermal / temperature fuse

For my DMX project (schematics is not important), I soldered this temperature fuse which has just two leads (see picture below). The fuse doesn't work (meaning it does not conduct electricity) ... ...
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89 views

Is 85% IPA (Isopropyl Alcohol) good enough to clean PCB after soldering?

Where I live I have no access to 99% Isopropyl Alcohol, only 85% concentration, my question is, is it good enough to clean PCB after soldering. Or I am wasting my money. Anybody with experience using ...
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1answer
25 views

3.5mm, 4 conductor, in-line, plug

I am struggling to find pictures of the plug I bought to figure out where to connect speaker wire to. It is a TRRS 3.5mm plug ...
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1answer
55 views

Adding wires to existing board. Not sure where to solder them

I'm trying to modify a small USB keypad to attach a foot switch to it, that would trigger the enter key. I disassembled the keypad and figured out which pins I need to contact to make an enter ...
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0answers
100 views

Soldering sensitive components

I am working on a project called LM317 power supply. The schematic is from the internet, and contains the regulator, filter capacitors, rectifier, potentiometer and protection diodes. I designed a ...
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1answer
150 views

Through-hole solder sparking

Here is a simple example of what been happening to various pcbs when I play with them. I have an arduino powered by USB. Then a 5V and GND connected to a logic level shifter's HIGH and GND ...
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1answer
344 views

Can I use steelwool for soldering iron cleaning

Wondering should I use steel wool for cleaning my soldering iron tip. Is it bad? Will it impact my tip? Will it clean the black oxidization off?
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94 views

Remove 0 Ohm resistor (solder bridge jumper)

I have an STM Nucleo-64 board that I want to power from my own 3v3 rail. To do so you must remove two solder bridges (SB2 and SB12 in the photos), both made with what appear to be size 805, \$0\Omega\$...
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3answers
91 views

Makeshift SMT Station. Any suggestions? [closed]

I am trying to do some surface mount soldering for my project and have hit a few snags. My hot air gun works perfectly fine for most of the PCBs I am making but one type in particular is problematic....
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0answers
64 views

Electronics at high acceleration

I would like to meaure g-force (100 - 4000 g) within a centrifuge (I know it sounds silly because it can be calculated but it is more of a learning thing). I thought of a 3d printed enclosure housing ...
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2answers
1k views

Shunt resistor, what value should I expect when soldering on PCB?

I am using a 10 mohm 1% shunt to measure current via voltage drop. My circuit is on a breadboard... It behaves as if the shunt has a value of ~30-40 mohm instead of 10 mohms. I double checked this ...
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1answer
77 views

Is it safe to solder headphone's cable that connected a pc by 3.5mm jack [closed]

While I fixing headphone, I wore headphone on my ear and plugged in headphone wire to my computer. Then I was soldering the broken cable of headphone. When solder tip touch the cable, it was listened ...
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60 views

Activated carbon face mask for protection against solder fumes?

What do you think about using a activated carbon face mask for protection against solder fumes as an alternative to using a fume extractor?
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2answers
172 views

Should I solder multiple wires together, or is there a better way?

I need to connect 10 thin single-core wires to each other permanently. They will carry at most 1A at 5V in total (100mA each). Can I just solder them together in a lump with shrink wrap tubing around? ...
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2answers
108 views

Importance of wicking during rework?

I’m wondering how crucial it is to remove as much of the old solder on a bga chip and corresponding PCB pads. Is it best practice to always wick before applying fresh leaded solder? (Presuming most ...
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79 views

Safely Remove IC from PCB

TL;DR - What is the safest way to "harvest" an IC from a PCB for reuse in a different PCB? So I'm working on a prototype that uses the MPU6050, but I think since they've been marked Not For New ...
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47 views

What is the cause of Capacitor short & Soldering pad short & Current unstable on PCB as powering up over time

For the first time, I made a 4 layer PCB and used a lot of 0402 cap / res on my board. But after I soldered the board, the circuit can only work for several mins. The four layers include 3 signal ...
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3answers
68 views

Is it normal/common to use this way of connecting point to point wire?

I want to make a circuit and am uncertain if the following is feasible/common and if there are better solution. From the pin headers (the light blue circles), e.g. GndIn (upper yellow circle), I want ...
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1answer
120 views

installing a DIP package with broken legs

I'm attempting to modify my NES (Nintendo entertainment system) for RGB output. This involves removing the PPU from the board and soldering it onto a board supplied in the mod kit. This installation ...
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1answer
102 views

Correct wiring of a variable resistor

I built the following schematic and I made a mistake. I wired the 4.7M preset reversed. This is the original schematic: And this is the schematic that I drew in Kicad: I already built the PCB but ...
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2answers
71 views

Soldering 0.4mm pitch QFN 48 chip

I have this QFN 48 chip which has the following design : As it can be observed, the pitch is 0.4mm. It seems like the conventional QFN adapters won't fit because the conventional ones has the pitch ...
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85 views

Does a lead/tin solder without rosin core release fume while soldering?

Many people address concerns regarding one possibly breathing toxic lead vapour from lead/tin solder wire by saying that the fume is from the flux in the solder wire, and not from the lead vaporising. ...
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121 views

Solder paste/flux when desoldering by heat gun?

I'm a total beginner to soldering stuff and I'm trying to change the charging port of my galaxy s3. I watched some videos using a heatgun to remove the old charging port and I found them all putting ...
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4answers
190 views

Can you use a respirator for soldering?

I know that breathing in solder fumes is not really good for you. I happen to have some respirators lying around. Could I use this instead of a fume extractor? It might save me some money if I could ...
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1answer
63 views

Does a soldering iron tip consist of multiple parts?

I recently purchased a new soldering iron and read here that it is good practise to tin the tip before actually using it. As I turned on the iron and applied solder to the tip, I noticed the very top ...
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1answer
24 views

Connecting a polyfuse (PTC / resettable fuse) without soldering

I want to connect up a polyfuse to protect a potentially flammable USB cable and a Raspberry Pi Zero in the circuit below. However it seems that most Polyfuses are supposed to be soldered and I'd much ...
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110 views

Triac Equivalent or Substitute

I have a schematic which uses a triac, for example a BT136. Please have a look at the attached schematic (this is a schematic for a soldering station) What parameters from the datasheet we should ...
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43 views

Are there blank prototype PCBs with staggered edges for a DB25 connector?

Are there blank prototype PCB boards I can buy that will accept a solderable DB25 with its staggered pins?
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902 views

What kind of breadboard and prototyping board do I need for this right-angle DB25 connector?

What kind of breadboard and prototyping board do I need to fit this right-angle DB25 connector? I'm new to soldering and don't know what the standards are. Additional information on this subject ...