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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96 views

Replacing the capacitor on an old Philips amplifier

My Philips amplifier broke down (model FA153) and my friend told me it's likely the capicators have worn out (they were produced in West Germany ;)) I am quite the layman in electrical engineering, ...
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22 views

How do I know if an NFC PN532 board has enough pins already soldered on? [closed]

I am a programmer and not much of a hardware person. I am trying to do a project with NFC, and I need something to read and write NFC tags/cards. I am looking for an NFC board which can do this. I don'...
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26 views

First time trace repair help [closed]

I broke the power supply connector that was on the motherboard of my PS4 and it took some of the PCB along with it. I've soldered many things many times before but have never had to do any type of ...
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29 views

How can I test the wires to the mini jack and circuit board [closed]

I have an Everready fm wireless transmitter allowing me to play my music (or audio books) on my phone over the car fm radio channel. I am supposed to go to an unused channel on the radio and then tune ...
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71 views

Tuning of a PID loop for heater element

I built a controller for a soldering iron (JBC C245/C210 specifically), which can supply up to 60W of power to the iron. I have a temperature control loop that runs at 10 Hz, which I am trying to tune ...
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2answers
44 views

How to use LED holder when mounting on a case with pcb inside?

I am making a case with a front and back piece with the PCB mounted on the back piece with LED supposed to be mounted in the holder in the front case piece. I was planning on soldering the LED to the ...
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2answers
78 views

Can I solder two USB cables together?

I've got two USB computer mice, one with a defect click button and one with a defect USB plug. Would there any issue if I simply cut them open and soldered together the mouse part of one with the USB ...
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20 views

ESP32 CAM gpio0 permanently grounded. how to fix?

I bought an ESP32 CAM and flashed it, I connected the UART with example code on the board but always got this: ...
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2answers
35 views

TPS54383 Thermal Pad

I'm experimenting with a TI Dual Output Buck Converter, the TPS54383. In section 11.3, on page 43, the datasheet says 11.3 PowerPAD Package The PowerPAD package provides low thermal impedance for ...
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2answers
118 views

Did a pretty bad job soldering a mouse switch. Is the chip damaged?

My mouse was double clicking so I, who had little to none experience with soldering, tried switching the switch of it. Had tons of trouble desoldering it without a desoldering tape or pump and may ...
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39 views

Soldering help: tip not hot enough

I have a 40W soldering iron and using 60/40 rosin core. I'm soldering wires onto a LED light strip (WS2812B) but the heat isn't strong enough and I might be doing things the wrong way. When I touch ...
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1answer
57 views

Damaged PCB - solder pad missing

have been trying to replace a capicitor on this inherited pcb. Sadly the negative pad for C6 (Orange circle) seems to be missing. Can anyone advise how best to get a capitor seated here? Thanks. PS ...
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66 views

Wire wrap question

I have an electronic organ that I will be repairing in the near future. The boards that need replacing are wire wrapped with 22AWG wire. I have the 22AWG wire wrap tool. If I cut the wires, the ...
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2answers
45 views

Through hole solder pad dimension rules?

Is there an electronic rule or just a rule of thumb regarding through hole solder pad dimensions? That is, if I have a 0.025 inch diameter drill hole (suitable for 24AWG wire), what should be the ...
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1answer
58 views

How to solder wires onto pins of an RFID chip?

I want to integrate a sensor with NXP's NHS3152 (Datasheet). To do this i have to solder the wires onto the pins of the RFID chip. What tools shoudl i buy to do this? What is a good reference to ...
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5answers
2k views

Would you approve this soldering job? [closed]

I am new to soldering, and I am not sure if I did a good job while trying to solder some pins into a HX711. My concern is that the solder in SCK and VCC are touching (also E+ and E-), so I thought ...
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36 views

Soldering QFP with thermal pad (but with obstructions/no vias on underside)

I will start by saying that I'm a complete newbie when it comes to soldering SMD. I've been practicing with scrap boards, and I'm getting there, but not sure how to approach this one. I am trying to ...
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1answer
97 views

BGA VCC and VSS shorted after desoldering

I am really confused with working with BGA chips. I am new to this but have been following other guides so I thought I should give it a try. I am using a DIY pre heater that has a 800watt IR bottom ...
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1answer
65 views

I'm having issue getting thick tin-lead 63/37 solder on Alloy 42 lead frame

I'm using Kester 2235 flux and using robotic solder dip so heights are static. I'm measuring thicknesses using x-ray fluorescence, they keep coming up very low. Should I be using an initial scavenge ...
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1answer
106 views

New soldering iron turns black as soon as it reaches 350C

I can't even tin it as it turns black befor I reach melting temperature. I tried 6 different tips and result is the same - it turns black and solder doesn't stick, I've no Idea what to do at this ...
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3answers
108 views

Why is the soldering surface of this pogo pin slightly rounded?

I was curious as to why the bottom of these SMT pogo pins are slightly rounded. Wouldn't it cause them to fall over before they are reflowed ? It seems that a completly flat bottom would make sense ...
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2answers
84 views

What is the best way to solder a large flat SMD shunt resistor so as to minimize joint resistance?

I have a BLDC motor controller that uses a high side 0.001 ohm current sense resistor (CSS2H-5930K-1L00F) and a MAX40201FAUA (50 V/V) to measure the current during motor operation via a Teensy 3.6 ADC....
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1answer
60 views

How to solder qlpf48 (or how to fix it)?

I think I'm really not so good at soldering. All places say it's it's fairly easy to hand solder LQFP ICs, but for me it isn't... On videos the tin nicely melts between the pins, and do not create ...
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1answer
64 views

making solder stick to the tip of a brushless motor

I have a brushless motor like this and want to attach some sort of steel bar like a needle to it. I am currently using superglue, however even after using a lot it still makes the bar come of rather ...
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2answers
82 views

Applied 370degC at the input of an ADC in a Microcontroller

I am using this Microcontroller - 100 pin I have configured pin 82 as an ADC input. ADC Reference voltage is 5V (provided from an LDO whose input voltage is 12V) To test my ADC accuracy, I took a ...
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2answers
78 views

Resistors with lead-free coating

I know it is bad to solder lead-free devices, such as resistors, with lead. However, is it possible (with less effort) to remove this lead-free coating on the resistors to make it possible to solder ...
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1answer
58 views

what type of solder do I have in this picture?

I have some solder that might be 30 years old. it has little ridges in it like the edge of a dime. does this mean is it NOT for electronics but rather for other types of metal to metal joints?
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1answer
43 views

Placement of Through Hole with a High Tolerance Dimension

Beginner question here. What does one do about the placement of the through hole when one dimension of the part has a high tolerance. For example, I place the through hole anticipating the center of ...
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41 views

Solder QFN88 by Hand

I just received my newest board i've designed and wanted to solder the first prototype. One of my Chips has a QFN88 Footprint. I'm quite experienced, but i just couldn't do it. Because of the small ...
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1answer
65 views

Secure a surface mount component to a plastic surface

I need to replace a broken planar circut (a Hall effect sensor) that was attached to a plastic hull of another unit (a rotor wheel assembly). And, most probably, will need to move the entire connector ...
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2answers
68 views

Suggestion for easy way to solder between LED strip and flexible PCB

I have an LED strip that I need to solder to a flexible PCB (designed in Eagle). What is the easiest way to solder the LED strip to the flexible PCB? Also, what can be changed in Eagle to make it ...
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1answer
59 views

Is it safe to power a 3V 50mA device through a USB port?

I don’t know much about electronics and from what I read on an instructable it was doable. I’m basically trying to stop using AA batteries for my wireless keyboard and wondered if I could just solder ...
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1k views

Soldering a thin spring steel wire to a PCB

Pretty noobish at electronics here. That said... I want to attach a very thin 1080 spring steel/music wire (30 AWG or ~0.25mm) to a pcb with a thru hole, hopefully in an automated way. The choice of ...
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1answer
34 views

Do I need to Reduce the Width of a Power Trace for Thermal Relief When it's Passing Through a Pin on the Chip?

I'm routing a PCB. Currently, all power traces are 20 mils. A QFP chip on the board requires multiple voltage rails to operate, I found the easiest solution is passing a power trace through a pin on ...
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1answer
47 views

splicing ac adaptor cord which is positive and which is negative?

i lost my original asus router power adaptor. so i have a 12v power adaptor with a tip that fits my 19v asus wifi router, and i have a old 19v power adaptor that has a tip that is too small to fit my ...
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2answers
81 views

Solder bridging on vias

What's the possible risk of using a board with a solder splash on vias? I couldn't clean it and it's passed ICT test. please advise.
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4answers
4k views

Need to keep re-soldering SMD resistors on PCB

I made a PCB to scale a +-100V signal into a 0v to 3.3V signal that I could read using an ADC on a microcontroller(see link for idea.) I used this solder paste flux to help with the soldering. ...
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3answers
81 views

Connecting 2 1W speakers

I am trying to connect together 2 1W speakers and mount them inside some ear defenders. I am a complete novice and am following an instructable tutorial. The tutorial is a bit light on the basics and ...
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2answers
119 views

How could I repair these burnt PCB holes and tracks, after my attempted repair? [closed]

I have an Akai mpk mini mkII. A common problem is a faulty power port, female USB B. I could not find anybody that knew how to fix it, so I tried myself. I have never soldered before, so I took a ...
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1answer
76 views

Soldering USB contacts - what kind of solder tip and what temp?

I am going to try and make my own mechanical USB cable. For soldering the wires to the usb plug, what is the recommended Solder tip type/size and also what is a good temp to use?
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56 views

Is there something wrong with my soldering iron?

I work with Sn 63 Pb 37, 1.8% flux solder which has a melting point of 187C, however, in order to reliably melt it I have to set my FX888D soldering station to 350C. Do I have a problem with my ...
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3answers
62 views

Why have a bottom mounted pad on a component and not use it?

For my design, I am using the ICM-20689. The pinout for the chip is taken from the datasheet: Once I get to the bottom of the datasheet, I notice that there is a bottom-mounted pad that is not ...
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1answer
65 views

Keepout area (courtyard) around ICs for hand soldering

I'm designing version 2 of a PCB. In the first version, I placed components as close together as possible to minimize board area (i.e. reduce board cost) and, for decoupling capacitors, to improve ...
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2answers
52 views

Wire hangers under connector

I have noticed small hangers under the Rosenberg HSD connector: What is the purpose of these? I can only guess it's solder paste storage for pin-in-paste technology but on the other hand, it's quite ...
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1answer
66 views

How did I break this desoldering pump?

I have this 30W desoldering tool from Velleman which I've used a few times without any issues... until I decided I wanted a finer nozzle. I turned it on after replacing the tip , and the base just ...
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0answers
48 views

Thermal reliefs for via-in-pad under BGA?

I'm doing the layout of a high-speed (Multi gigabit) system based on an FPGA with more than a thousand BGA pads and 0.8mm pitch on a 10-layer board. I'm using via in pads that will be copper-filled ...
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2k views

Why are the same alloys solid in solder wire and liquid in solder paste?

Is there a chemical difference between alloys in solder wire and alloys solder paste that make solder wires solid and solder paste fluids? For instance, this solder wire and this solder paste both ...
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2answers
110 views

How to solder a wire to a massive copper busbar

I need to solder a wire (tinned coper) to a massive copper busbar, I tried two approaches but to no avail. I tried heating up the busbar with a heat plate to 300 °F (150 °C) and then tried to solder ...
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1answer
41 views

Removing single 1212 (3030) LED

Is there any way to remove and replace a single 1212 (3030) LED from a heat-sink board as shown in the images?
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1answer
19 views

Troubleshooting connections between strips of WS2811 Addressable RGB LEDs

I'm hoping for help troubleshooting a light array I built for my son's room. I strung together 8 strips of WS2811 addressable RGB LEDs (30 per strip). I soldered all the strings together, and tested ...

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