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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Low temperature solder

I am soldering LED strips together but I am in a location without access to an electrical outlet. I am using a battery powered soldering iron but it doesn't get very hot compared to my home soldering ...
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28 views

Good tips for how to connect cables into Mux Sheild II?

I just got a Mux Sheild 2 and got it working as I expected. Now I started to find out how to actually connect the I/O cables to the board. Doesn't seem to be as simple as I thought. I don't want to ...
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83 views

how can I “ruggedize” a 3.5mm jack on consumer electronics?

I'm not sure if this is the best place to ask this. I've had repeated issues with stress on 3.5mm jacks causing breaks to the solder which means either rewiring or throwing the headphones out. ...
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22 views

Replacing SD card reader on a Raspberry Pi B+

I recently purchased a Raspberry Pi B+. However, the micro SD Card reader had a defective spring loading mechanism, so the card would not lock in place (a new Pi is now on the way!) However, I would ...
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2answers
155 views

Is this soldering of a wifi antenna showing a dry joint? [on hold]

It is a wifi antenna, one leg detached from the PCB when I was testing it. Is is a dry joint,(it looks crystalline to me) or just user error, i.e. I knocked it off maybe. The wifi antenna is not ...
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31 views

how to solder pins on pic32 io expansion board?

I have purchased a PIC32 ethernet starter kit along with its Input Output Expansion Board. Unfortunately IO expansion board ...
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48 views

Soldering on keyboard controller circuit board

For fun, I took a USB keyboard apart as I'd like to use the keyboard circuit board without the actual physical keyboard. I am in need of soldering advice however. Opening up the keyboard I see this: ...
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4answers
96 views

How to tin a soldering iron after unboxing [closed]

i have bought cheap soldering iron before but when i turn it on waited to heat up ,it turned black and wont take a tin .am i doing it wrong? I wasted 2 soldering iron like this. It turned all black ...
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71 views

How to dispose of solder waste?

Is there a safe way to dispose of lead solder waste? Like used sponges, PCBs, tips, etc. Should I place it in a bag, label it and throw it to a battery disposal boxes I see here and there?
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457 views

How to solder micro stepper motor pins?

I have a hobby project where I would like to use micro stepper motors as shown in the picture below. However, as you might be able to see, the spacing between the pins is incredibly tiny and each pin ...
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1answer
66 views

Reused MCU unit does not work

I had a board with ATMEGA16 (SMD package) micro controller and I had to program through ICSP and it was working fine. Later I needed to make some changes on the board. So I designed a new board and ...
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470 views

SMD Crystal solder(?) problem and any recommended test procedure

I use a 32.768 kHz SMD crystal (datasheet) for a MCU. Here is the layout part of the crystal. Here is a view from an actual PCB I mounted the components by hand-soldering, and produced about 30 ...
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75 views

Fan cools solder down too quickly

So I'm just starting to get into soldering, and being a noob, I got the most el cheapo solder kit you could possibly get. Now the problem is that the soldering iron isn't very hot. So with lead-free ...
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0answers
54 views

PCB repair question (ripped cap pad)

I ripped the thru-hole pad on back of the PCB on the positive terminal of the C18 cap shown in this diagram, and there are no visible traces coming from it. Rather than try and repair the pad (it's ...
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1answer
86 views

Wire Wrap Joint in High Humidity

How does a wire wrap joint compare to a soldered joint in high humidity conditions? Corrosion? Electrolysis? Joint resistance creeping up?
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4answers
52 views

Temporary SMD Adhesives? [duplicate]

When I do prototyping I solder my PCBs by hand. That works fine most of the time, but I run into a problem when I have to solder chips with fine pitch (Google for VQ100 to get an idea of what I'm ...
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1answer
27 views

Two different types of solder alloy used in process - allowed or not?

Recently it come to my attention that using two different lead-free solder alloys in one process should not take place. Example: populated PCB is flown on wave solderer with alloy X and then (if ...
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2answers
107 views

Cheap Soldering Iron vs Cheap Solder

I have two cheap soldering irons, one of which was given to me. I was also given some solder (of unknown quality), which I recently used up. I bought some cheap solder from Harbor Freight. I've used ...
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108 views

How to solder wires to a hobby motor

I am using the cheap 1.5-3v motors from radio shack and I try heating up the connectors on the motor, but I think they are melting inside because in one case the pole now wiggles, and the other case ...
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61 views

LCD printing blocks

Over the last couple days i have attempted to get my LCD to print "hello world". However for some reason not matter what code i upload from the liquid crystal examples on the arduino program, it ...
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3answers
382 views

Can I use thermal paste instead of solder for a SMD heat sink?

I have some high-power (~5W) SMD LEDs that I will be running for extended periods of time. I would like to use a PCB mill to make breakout boards for these chips for easy prototyping. Ideally I would ...
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1answer
54 views

How to test/flash many modules?

Suppose I have several hundred pieces of the same module to test and flash, and the connectors themselves have wire holes in them like below. What's a good way to make the connection without ...
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2answers
874 views

Why do we need to remove flux from circuit boards?

My manager at work told me that the liquid flux we use when reworking SMD circuit boards is electrically conductive,and that is why he INSISTS that we clean every board we work on.Is he right,or is he ...
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4answers
679 views

I didn't tin my solder bit…now what?

In my haste to get soldering with my new iron (first time soldering in more than a decade...) I completely forgot to tin my bit. Subsequently I've managed to part-tin it, but it's a bit of a mess. ...
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5answers
157 views

Through Hole Soldering- Minimum lead protrusion

I am working on a bit of a strange design: all components, SMD and Through-Hole, are mounted on the top side of the PCB, except for some really beefy MOSFETs, which are mounted to the bottom side of ...
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828 views

For how long can one hold a soldering iron on a component pin when soldering?

Somebody told me not to keep a soldering iron on the pin of a through hole package for more than 2 seconds. I am not aware of where he got this number from. When soldering we come across discrete ...
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1answer
90 views

Solder through-hole or surface-mount components first?

I am new to surface mount soldering. On a board with both SMT and through-hole parts (header pins), which parts should I solder on first? I imagine the technique I use for SMT soldering is ...
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138 views

soldering protective gloves

Do you use any protective gloves while soldering? It has happened to me a lot that hot solderer touches my fingers. I am not sure if protective gloves would reduce freedom of my fingers for their ...
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80 views

what safety glasses

As far as I know soldering glasses are for eye protection against lead fume. As a personal experience I have observed some parts of lead with tiny explosion due to heat come out of lead with a smoke ...
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56 views

Is it compulsory to pass PCB through Reflow after wave soldering?

Is it compulsory to pass PCB through Reflow after wave soldering ?
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56 views

recommended wattage for soldering station

I'm looking at buying a new soldering station and trying to figure out what would be the right wattage. I'm going to soldering everything from electronic components (not much SMD, if any) to 16mm2+ ...
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2answers
75 views

What makes lead-free solder harder to use? [duplicate]

Soldering in a RoHS-compliant way normally means using a solder that does not contain lead - the metal that made up most part of common solder before. Handsoldering using lead-free solder seems to be ...
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3k views

What makes solder harden?

Soldering wire is very soft and pliable, but solder on a circuit board is hard. Why? I haven't been able to find a definitive answer, but some ideas that come to mind are: Some kind of chemical ...
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51 views

Solder mask custom shape in altium

I want to have a region in my PCB without solder mask while the other regions should have solder mask. I am not sure how do I do it in Altium? To be precise I want say a custom shape solder mask free ...
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72 views

Solder mask free regions on PCB

I have noticed many PCBs with solder mask free regions/areas on the edges. I am attaching an image with this. What is the purpose of such areas ? What I can think of is heat transfer to the ambient ...
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44 views

What is the critical temperature when (batch) desoldering?

I have seen videos on youtube with some guys using hot air pistols (or even small propane burner with bunsen flame) to desolder the components from a PCB. The job is done REALLY quick! The components ...
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83 views

Cheap Gas or cheap electric soldering iron?

I have a worn down cheap soldering iron from Radio Shack. It is barely hot enough to solder and takes a while to heat up. I want to know if I should use a gas one next. Pros: Heats up instantly ...
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2answers
122 views

Is it possible to recover from this un-soldering mistake?

I did a real mistake when un-soldering this PCB : The metal part of the PCB was accidentally removed. Now it is impossible to solder anything at this place again: the solder material (what's the ...
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1answer
85 views

How to identify solder

Recently, my headphones mic stopped working and I figured it was probably the jack (although I'm not 100% sure). So what I've set out to do is to solder a new jack on. I asked my Dad and he said the ...
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83 views

Soldering USB cables : USB male to pin headers?

I find it quite difficult to work with USB cables by reusing premade ones : the wires in them are very thin, and it is quite hard to solder them properly, without breaking them. How do you solder ...
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White hairs inside a headphones cable

I have a cheap set of Phillips SHE3000 earphones with a broken wire on the plug. Since I was repairing another set of headphones, with the same problem, I bought an extra plug, just to try repairing ...
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97 views

Max current through solder tracks?

I've searched Google and couldn't find a simple answer to this question. I'm guessing the only limiting factor is the solder's melting temperature? I don't think I should have a problem with < 20A, ...
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83 views

Documented health effects when exposed to solder / flux smoke? [duplicate]

I run a repair shop and occasionally we do soldering work, but nothing too crazy. I was wondering what are the documented health effects when exposed to solder smoke. We do have an open space with low ...
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1answer
83 views

Can I use masking tape for 12V max insulation?

Hello. Would it work if I put masking tape over a solder joint as insulation which would carry 12V max? I'm connecting a general-purpose 3-12V AC adapter to some wires. Any help would be appreciated. ...
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1k views

Which are the safety recommendations for soldering?

I was reading about tin alloys for electronics soldering and found it it has about 40% of lead in composition. Lead, everyone knows, it's very dangerous to breathe it due to being a heavy metal. Also, ...
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165 views

Soldering multiple resistors in series

I'm starting the wiring for my project and would like to solder two resistors together in series. There is good chance that the wire will be exposed to heat and gentle turbulence. What is the best ...
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1answer
71 views

Split USB Port Into 2 Separate Ports

I've a device (An old NES cart, actually) that I've fitted with a USB port and a flash drive. I'm using it in a NES to Raspberry Pi conversion. My idea was to have a port on the side for connecting to ...
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4answers
69 views

Cutting off metal anchor legs on an HDMI port or Metal connector? What to use?

I'm looking for some advice on how to cut an HDMI port anchor leg off using some type of miniature cutting wheel. I bought a dentist micro drill, but I'm unsure which type of burs to purchase and type ...
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1answer
87 views

Coating a soldered connection on a small circuit board

I have a small PCB, about the size of a quarter and having a Bluetooth chip on it. I have 4 wires soldered to the board. 2 of which are for a 3.7 Volt battery connection and 2 are to connect a small ...
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81 views

What will happen if I solder two 120mm 12v computer fans to one 12v phone charger?

After enough YouTubing and self educating, I decided to take the plunge and purchase a soldering iron. It took me two attempts (apparently the cable of the charger that has the grey dashes on it is ...