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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25 views

problem de-soldering mobile phone power button [closed]

I need to replace my Galaxy S2 i9100’s power button. The following video demonstrates what I need to do: https://www.youtube.com/watch?v=1F6C13O76qk It looks really simple… de-solder the current ...
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2answers
222 views

4 Digit 7 segment display LED missing one light (on all four digits) [closed]

Hi I ordered online a voltage meter and got this tiny cute little fast refreshing pretty darn precise reliable meter. HOWEVER I am missing on all four digits the left lower vertical light piece. What ...
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1answer
50 views

Header pin plastic sliding off stripboard

When I was soldering header pins onto a stripboard I noticed the plastic in the middle of the pins had become extremely loose to the point if I turn the board upside down the pins will fall off the ...
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1answer
31 views

Wave soldering - using Pot solder

new member! I understand the wave solder process for pin soldering, I seen videos and read literature while pot solder used for tanning purpose my question about why we requires the solder to flow ...
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3answers
2k views

What does “no clean” solder actually mean?

I bought some solder that says it doesn't require cleaning. The description specifically says "Eliminates the need and expense of cleaning". But there's still a lot of some substance left on my board ...
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0answers
43 views

Impossible looking solder points on NRF24L01+ module

I cannot even fit two dupont connectors side by side. I am really quite uninitiated in electronics, being a software developer. Is this an industry standard or some sort of way to connect this? It's ...
0
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1answer
77 views

What is the best solder type in terms of health? [duplicate]

Hi im thinking of picking up a soldering iron and im wondering what type of solder is the best in terms of health
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1answer
41 views

Installing a USB-A Port on D-Link DIR-300NRU B7 with Ralink RT5350F Chipset [closed]

I am writing to enquire about the installation of a USB-A port into the existing but soldered pins on DIR-300NRU B7. The board is given below: The USB pins are located on the bottom right. The ...
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0answers
44 views

pre-soldered DC motor?

I am a complete Arduino noob and I bought the arduino starter kit, it comes with a 6V DC motor with wires already soldered onto it. The ground wire solder broke and because I don't want to solder it ...
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2answers
93 views

Touching Pin Causing PCB to work

Below is a cutout of the schematic and close up PCB for a detector I've asked several questions about. Specifically pin 6 on U3, R23, and R21. I've measured voltages higher than 7.5 from pin 5, ...
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1answer
54 views

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 ...
1
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2answers
99 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. ...
0
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1answer
47 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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0answers
63 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
104 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 ...
1
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0answers
105 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?
6
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4answers
472 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 ...
1
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1answer
93 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 ...
4
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3answers
508 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 ...
0
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1answer
79 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 ...
0
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0answers
59 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 ...
3
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1answer
93 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
58 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
31 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
113 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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2answers
135 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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1answer
64 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
438 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 ...
2
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1answer
57 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
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2answers
967 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
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4answers
690 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
208 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
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2answers
857 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
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1answer
108 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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4answers
157 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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2answers
90 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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0answers
58 views

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

Is it compulsory to pass PCB through Reflow after wave soldering ?
3
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2answers
60 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
77 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 ...
27
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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
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1answer
53 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
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0answers
78 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
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1answer
45 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 ...
2
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2answers
126 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
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1answer
88 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
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0answers
92 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
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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
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1answer
123 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
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1answer
85 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
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1answer
90 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. ...