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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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Perfboard short circuit debugging

I've got a perfboard circuit I put together that's drawing 1.7A when just the 5V and GND pins are connected. As you might have guessed, this is not ideal given the existing components. The A4988 motor ...
Flubberknuckle's user avatar
6 votes
7 answers
1k views

What would cause desoldering braid to simply not work?

I'm trying to replace the triac in a floor lamp dimmer, and completely failing to remove solder from the pads with desoldering braid. I've desoldered plenty of times before, though admittedly not ...
Neil Steiner's user avatar
1 vote
0 answers
66 views

RX and TX show 0 voltage: is my ESP32-C3 broken? [closed]

While desoldering, I think I damaged the TX and RX pins. I set the multimeter to DC (20), connected the black probe to GND, then the red probe to RX. The reading was 0. The same with TX. And the ESP32-...
wyc's user avatar
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4 votes
3 answers
452 views

Desoldering components

One time, I accidentally reversed the polarity of a diode (luckily I noticed it before I powered it on), so I tried to desolder it. I tried solder pumps and solder wicks but nothing happened. I think ...
Andy K's user avatar
  • 369
9 votes
6 answers
2k views

Tips on removing solder stuck in very small hole

I'm a beginner in soldering. I was trying to change the LED of my mouse, and I successfully removed it, but now I can't put in a new LED because there's solder stuck in a very small hole. I only have ...
Anonymous's user avatar
0 votes
1 answer
46 views

How to replace microjack on stereo earplugs with microphone [closed]

I broke a microjack connector. It is attached to a set of stereo earplugs with built in microphone. I know how to solder, but I am not sure how to find the correct replacement plug and how to identify ...
Jostein Trondal's user avatar
0 votes
1 answer
119 views

Fixing the voltage leak on a soldering station - What should be done? [closed]

I found a soldering station Aixun T3A on youtube that got a very positive review. The review said: High temperature accuracy Fast temperature heating speed Low temperature overshoot High power ...
euraad's user avatar
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2 votes
3 answers
523 views

Are these bodges equivalent to the traces they fix despite bypassing vias also connected to the traces?

Given these broken traces underneath two ICs: For the broken traces that run pad-via-pad, is it OK to bodge on top of the pins of the ICs like this, even though this "bypasses" the vias? I'...
Mars's user avatar
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18 votes
2 answers
4k views

Why did my 50µm gold wire vanish when I tried to tin it?

I was trying to tin 50µm gold wire to solder it to something bigger, but touching the gold wire to a bit of molten solder on the tip of an iron caused a couple of mm of wire to disappear. The solder ...
Chris H's user avatar
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1 vote
1 answer
95 views

Black spots on soldered joints

When I solder, I often end up with black spots like the ones you see in the picture. I circled one. Is it burned flux? Will that affect the connections? How to avoid them?
wyc's user avatar
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1 answer
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Is there flux that doesn't brown under heat?

Adding flux (MG8341) to rework a component is resulting in ugly brown stains as shown in the picture below; this is a flexible circuit board with white cover-lay. The flux started to turn brown add ...
KJ7LNW's user avatar
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0 votes
1 answer
150 views

How badly did I damage board with first time soldering to remove component? [closed]

First time soldering. Is this thing unusable or might it still work?
lasagna's user avatar
3 votes
3 answers
1k views

Is it an issue if connections are too close to each other?

I like the idea of making very compact circuits. However, it worries me that the connections will be too close of each other, increasing the likelihood of shorts or melting nearby solder by accident. ...
wyc's user avatar
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0 votes
1 answer
64 views

What is the best way to adapt a larger connector when the insertion holes on the PCB do not match?

Good day, everyone. I have a Type-C connector on a device that is much larger than the micro USB connector I had previously. The insertion legs do not align with the holes on the PCB, and since it is ...
condor12's user avatar
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1 vote
3 answers
157 views

Cleaning excess solder from small through-holes on a PCB

I am trying to desolder a micro connector, and one of the through-holes where the connector legs are soldered is so small that I cannot remove the excess solder. I have tried using flux, adding new ...
condor12's user avatar
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10 votes
4 answers
2k views

How do I de-solder cheap proto boards without pulling pads off?

The title kind of says it all. I've been buying these prototyping/breakout boards and they come with a bunch pin headers that I don't want to be there because I want to mount them in my own way. Every ...
ipmcc's user avatar
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1 answer
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Soldering flux and cleaner for analog SMT boards

I decided to build some precision analog circuits and will need to solder a few parts (on a surface mount board). So far I have soldered almost exclusively digital or non-precision analog and almost ...
Davide's user avatar
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3 answers
269 views

Solder doesn't melt

If I solder something and wait about 24 hours, I can't remove it anymore. I am using a soldering iron at 350 degrees C. I tried turning it up but it still won't melt. Even when it does melt, it's ...
Andy K's user avatar
  • 369
0 votes
2 answers
253 views

Wiring USB-C connector to micro-USB

I have some problems wiring the micro-USB cable to a USB-C connector. I have used the wiring scheme found here, but neither the data are transferred nor the power is supplied to the device. The ...
jack23456's user avatar
3 votes
3 answers
974 views

Beginner: Solder won’t flow onto thermostat tabs

I’m trying to repair my espresso maker with a new thermostat but am unable to get the solder to flow. I’m a beginner but have had some experience soldering my own guitar pedals using stripboards in ...
tylorreimer's user avatar
1 vote
1 answer
101 views

What features to look for when buying a microscope?

I have been looking at different microscopes for soldering, specifically for micro-soldering (SMDs). I have seen the dinky USB microscopes, the smaller pedestal-type with small screens, units mounted ...
agarza's user avatar
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0 votes
1 answer
40 views

I'm trying to connect an AS3933 chip to a CAS143-47

So basically AS3933 has 3 pins (LF1P, LF2P, LF3P) which need to be connected to pins of 3d antenna (CAS143-47 in this case) and to common ground LFN. My CAS143-47 antenna has 8 pins with 3 pairs of ...
Angela 's user avatar
0 votes
1 answer
84 views

Will my stuff be "leaded" when soldering? [closed]

I've been soldering for some time now. I use 60/40 leaded solder. I usually wash my hands after soldering, but while soldering, I often touch other things, for example: phone, pendrives, keyboard and ...
Benedek Hirth's user avatar
0 votes
3 answers
142 views

Solder is getting 'pasty' when heated

I am not an expert at soldering but I am good enough for simple tasks. I am trying to solder some wires to a PCB. If I use some 'old' solder (Radio Shack, 60/40 Rosin-core) I get a result that is ...
Pascal's user avatar
  • 3
4 votes
4 answers
802 views

Are there any techniques for soldering USB-C 16 pin?

I am trying to solder Type-C SMD USB connectors but I can't do it properly. Despite using an SMT stencil for soldering, each time I am having an issue and I can not solder it properly. Sometimes pins ...
mehmet's user avatar
  • 1,139
4 votes
3 answers
252 views

Can I solder a press-fit connector with large footprint holes?

For my project, I designed a PCB using press-fit connectors. However, due to the footprint error, the holes were larger than they should have been, and these PCBs are 8-layer high-speed PCBs. ...
esat's user avatar
  • 51
2 votes
2 answers
176 views

Using solder to extend RTD cable?

I have a 3 wire RTD sensor (Pt100). The leads coming off of it are not long enough to reach our temperature controller. I bought some RTD extension cable (3 wire) from the same company. Is it okay to ...
Open_Hamster3337's user avatar
10 votes
3 answers
994 views

Ways of improving USB-C mechanical durability

Many PCB-mounted connectors, in my case a USB-C have no specification regarding mechanical integration. Often, the mechanical durability seemingly relies on through-hole (sometimes even surface mount) ...
NoobPointerException's user avatar
0 votes
0 answers
52 views

Crystal load capacitor physical defect

I have a 16MHz crystal that is used to derive a 60MHz PLL. I have not seen many issues but have a PCBA that loses its PLL lock. I'm not sure why but I looked at one of the load capacitors up close (...
Orca_StackOverflow's user avatar
0 votes
3 answers
272 views

Is soldering flux absolutely necessary for lead-free solder?

Looking through videos of people soldering fine-pitch IC packages (like SOIC, SSOP, SOT), they usually use a large amount of rosin-core flux to make the joints nice and shiny. I have lead-free solder (...
lemon's user avatar
  • 590
1 vote
1 answer
76 views

Choosing a strong/flexible wire for Piezo bender

I am using AB4113B The issue: Due to vibrations wire soldered on the Piezo is breaking. The setup: Piezo (metal end) soldered on a PCB directly, and wire is soldered on ceramic part to a PCB pad close ...
Anurag Kumar's user avatar
1 vote
3 answers
226 views

How can I get rid of oxidisation of my soldering tip? [duplicate]

I recently installed a new tip on my soldering iron, but when heating it up for the first time (target temperature: +370 °C), it got a reddish plaque (some kinda oxide, I suppose), so that it it's ...
Neppomuk's user avatar
  • 575
3 votes
5 answers
967 views

Tolerance of board-to-board headers

I am designing two boards. The bottom one is the power board that contains power switches on IMS (metal-clad board), while the top board is the logic board (4-layer FR4). Board to board height is ...
Eng Sam's user avatar
  • 489
0 votes
0 answers
47 views

Solder Wave Residue

Issue: 1-3 days after maintenance, chunks of solder residue starts to show in the solder wave bath. This creates blockage in the nozzle. Any notes how to solve this problem? Notes: No new chemicals ...
l-Inġinier's user avatar
3 votes
2 answers
156 views

Cheap vs. expensive reflow oven

I am trying to build my capacity to solder SMD onto two-sided boards. As far as I understand, for example from this post, a reflow oven is better than a hotplate for reasons of uniformity in ...
villaa's user avatar
  • 139
9 votes
8 answers
4k views

Soldering iron tip gets oxidised

I’ve been soldering (amateur level) for about 2 years now and a common issue I keep facing is the tip always gets oxidised. I recently bought a new tip and I’ve used it 4 times. The first three times ...
Syed Zain Ali's user avatar
2 votes
1 answer
115 views

How hard is it to DIY soldering (reflow smt) a image sensor\silicon die to FFC cable?

I have a need of a rapid prototype of a image sensor and rolling my own image sensor die. For example, what if I wanted to mount an AR0130cs sensor to an FFC? I don't care about dust or contamination, ...
Voltage Spike's user avatar
  • 84.6k
1 vote
2 answers
143 views

Soldering PCB to PCB - how

I have designed and then manufactured a a PCB that is basically a WiFi thermometer with MQTT capability. The PCB hosts several components, plus an 18650-type battery holder capable of holding 2 ...
mrcsrplln's user avatar
3 votes
3 answers
145 views

How to reliably connect an SMA connector to two pieces of stainless steel?

We are attempting to electrically connect an SMA connector to two pieces of stainless steel to measure the capacitance between them for a school project. In the picture below, you can see the two ...
s0ggyj0hns0n's user avatar
0 votes
0 answers
52 views

Bluetooth transmitter headphone jack soldering points

I am in the process of modding a 7th gen iPod. I have purchased a Bluetooth transmitter/receiver from AliExpress (VALORO 2 IN 1 transmitter) andtaken the PCB out. Noe I am unsure what points to solder ...
ArrakisHackvist's user avatar
0 votes
1 answer
240 views

What temperature should I use to desolder a FPC connector by heating the back side of the PCB with a hot air gun?

I am learning how to use a hot air gun on PCBs. I saw some videos of FPC connectors being desoldered by heating the back side of the PCB with a hot air gun. I am assuming it is being done to prevent ...
Blurry Sterk's user avatar
1 vote
4 answers
99 views

How to match up soldering iron tip points with the right pad size?

Sometimes it's really difficult to understand the heat transfer mechanism on the PCB from the soldering tip because I can see that the solder melts but it does not stick to the soldering pad and it ...
Bubbly_Bh's user avatar
0 votes
2 answers
229 views

What model is this Weller pencil soldering iron?

I have this old Weller soldering iron that was issued to me at my first job in the early 80's. It has a lot of sentimental value to me. I was going to order some new tips and the one that is on it ...
Paul's user avatar
  • 1
0 votes
1 answer
98 views

How do I connect two RFID readers at the same time to my Arduino?

I’m making a simple door lock for my room using an Arduino uno and an RFID sensor, I made the code to unlock the door with the correct tag, but it’s only on one side, I need a way to unlock the door ...
Computer Noob's user avatar
0 votes
1 answer
214 views

How do you wire a usb type c female connector?

I'm modifying my Nintendo controller, and I need to solder some stuff onto the usb type c female plug. However, I noticed there are five pins, and I have no idea what a single one is. Could you ...
Noob's user avatar
  • 3
1 vote
1 answer
498 views

Hot air. Too hot or too slow?

I set my hot air device to 320 °C and at 20% flow. Using low melt solder paste it takes quite some time to desolder BGA chips which I think get singed! Increasing to 400 °C is faster but the tiny ...
Omowright's user avatar
1 vote
3 answers
280 views

Soldering problems, is it me

I have tried soldering together some very simple DIY projects, such as little kits with a few blinking LEDs and a transistor or two. My soldering is terrible and I confess not actually knowing what I'...
nuggethead's user avatar
  • 1,139
0 votes
0 answers
66 views

Connecting 2 LED strips and 1 driver

I have the following things: 1 5w 3in1 LED strip 1 10w 3in1 LED strip 1 20w 3in1 Driver The driver has 3 wires in output, 2 in input. The LED strips each have 3 ...
Sevil Dubariya's user avatar
1 vote
2 answers
79 views

Do LEDs turn on because of heat? [duplicate]

I was watching one of my seniors soldering a few SMD LEDs on one of his power converters. He touched the iron on the anode of one of the LEDs and it glowed. I think it is because of thermal generation....
Jonathan_the_seagull's user avatar
0 votes
1 answer
100 views

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.
Adnan 1's user avatar

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