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.

learn more… | top users | synonyms (4)

2
votes
1answer
50 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 ...
3
votes
2answers
781 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 ...
4
votes
4answers
643 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. ...
1
vote
5answers
77 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 ...
4
votes
2answers
774 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 ...
2
votes
1answer
71 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 ...
0
votes
4answers
96 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 ...
1
vote
2answers
67 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 ...
0
votes
0answers
49 views

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

Is it compulsory to pass PCB through Reflow after wave soldering ?
3
votes
2answers
51 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+ ...
1
vote
2answers
67 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 ...
26
votes
5answers
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 ...
0
votes
1answer
46 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 ...
1
vote
0answers
58 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 ...
0
votes
1answer
41 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 ...
0
votes
0answers
70 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 ...
2
votes
2answers
114 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 ...
2
votes
1answer
71 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 ...
0
votes
0answers
58 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 ...
15
votes
2answers
2k views

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 ...
0
votes
1answer
76 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, ...
0
votes
1answer
77 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 ...
0
votes
1answer
71 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. ...
6
votes
4answers
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, ...
0
votes
2answers
92 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 ...
0
votes
1answer
54 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 ...
1
vote
4answers
63 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 ...
1
vote
1answer
81 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 ...
0
votes
1answer
72 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 ...
1
vote
1answer
65 views

How do I solder a wire to a motor body?

I'm trying to solder a few capacitor grounds to a small motor body. I'm using 60/40 flux core solder and I cannot get the solder to stick to the body of the motor! Is there some secret way of doing ...
0
votes
1answer
76 views

Do soldering glasses protect eyes from capacitor explosion

I am concerned about safety while working with electrolytic capacitors. Can I use soldering safety glasses to protect my eyes while working with electrolytic capacitors?
0
votes
3answers
115 views

What soldering kit for tiny electronics? [duplicate]

This is a my first foray into building electronics. I am building a project that uses chip/SMD LEDs and resistors. What type of soldering kit should I be using for those devices?
7
votes
1answer
732 views

What are the dents for?

I bought a few bc417 serial bluetooth modules which have pins that look like this: Is there a standard name for this kind of pin? I believe I can treat them like any other SMD pin, but I'm curious ...
0
votes
2answers
97 views

Solderless headers?

Where can I find solderless headers suitable for a solderless breadboard.? This is for a raspberry pi project I'm working on which requires the mounting of an LCD screen. I have explored the ...
0
votes
0answers
31 views

What is the temperature vs time relationship for derating soldering iron dwell time?

Another question here involves someone using a 100 W iron to solder electronic components. This is much hotter than required, in my experience. The soldering specs for ICs are typically ...
1
vote
3answers
102 views

100W Soldering Iron Risks And Arduino

So I bought a 20W soldering iron a while ago and I found the experience very frustrating as the tip does not get hot enough quickly and when it does melt the solder it gets cold so quick I cant get ...
1
vote
1answer
48 views

Modifying a Boss DS-1 Distortion pedal, possible lifted pads

My apologies if this is in the wrong place, seems like the people on this section would know what to do in this situation. I am brand new to circuit bending and electronics work in general, really ...
0
votes
3answers
99 views

Working with a tiny IC

I have recently purchased several Atmel's touch sensor IC's AT42QT1010 which are extremely tiny (1.6mm x 2.9mm) and I would like to be able to mount them on a breadboard. I have tried soldering them ...
0
votes
3answers
117 views

Soldering, Chips for Beginners

I am currently running a club for kids (9-11) for Arduino and we are making a robot and are moving on from motor/transistor drivers to half-hbridge (so we can go backwards). The kids are learning to ...
2
votes
3answers
105 views

Is it possible to solder this non-standard package (sim900) using hot-air station?

I don't have any experience with hot-air soldering. Would it be possible for a complete newbie to solder this kind of package using a hot-air station: I only need to solder pads closer to the edges ...
14
votes
4answers
2k views

Are solder bridges on chips always bad?

I just bought my Arduino Ethernet shield – a knock-off one for $10 instead of $60. I connected it up, but it doesn’t work – LEDs light up but do not blink, and no ethernet link is established ...
0
votes
0answers
113 views

Tips for soldering delicate smd ICs without smd equipment

Lets say I have a physically rather delicate part like a MAX6143AASA50 (a SOIC-8 package, the one I am going to solder, but the exact chip doesn't really matter) and want to solder it, but don't have ...
0
votes
1answer
59 views

Is it mandatory to use thermals in hand soldered PCBs?

I understand thermals are used to prevent tombstoning during oven soldering by allowing all pads to heat up more evenly, but are they necessary when the PCB is going to be soldered by hand? Consider ...
0
votes
2answers
66 views

How to apply temporary pins to PCB

I want to temporarily solder a pin on my pcb where I know for a fact that it's going to be moved soon. Is there a better way? Is there like a plastic piece I can attach to the other side of the ...
21
votes
6answers
2k views

How to hold SMD parts in place while soldering?

I go through this every time I have PCBs I need to populate with SMD parts, and this has become more an issue as pin spacings have gotten tighter, and my hands have become less steady with age. So ...
1
vote
1answer
69 views

Could cold Solder be the cause of burnt components?

I have a mainboard of a slot machine that has burnt resistors. I wonder if this could be related to cold solder, because the slot machine remains on for long periods of time (months at a time) and ...
11
votes
2answers
358 views

How much larger should a plated-through hole be than lead diameter to get good solder wetting?

I'm designing a new PCB where I have a whack of connectors that have to line up with the metalwork. These are a two-piece Neutrik XLR connector where the insert is soldered to the PCB and then mates ...
1
vote
3answers
169 views

Tips for desoldering difficult to desolder mini transformers

I have to replace a couple of small transformers without destroying the PCB or the transformers. Unfortunately my phone camera is unusable so I need to describe them and what makes the situation so ...
2
votes
2answers
100 views

Is there any problem soldering a device while it's powered on?

I'm frequently tempted to solder to devices that are still powered. Assuming that: it's a low-voltage device there's nothing static-sensitive on the board I'm not going to short anything out ...
0
votes
1answer
86 views

Temperatures for replacing BGA chip?

Newbie here who is going to try his hand at replacing a BGA chip on a laptop motherboard. I have ordered a new chip: NVIDIA G84-950-A2, and want to confirm some temperatures. Based on some ...