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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How to attach cable to a solder eyelet? [duplicate]

I believe that's what such connector is called. I want to attach 18 awg wire to it. Is slide on terminal the best choice?
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1 answer
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Assembled PCB not working. Any ideas? (round 2)

Attached are schematics and an image of a circuit I made for a project. I asked this question months ago with an earlier iteration of the circuit and finally got around to assembling it on a single, ...
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DC power supply exceeding current limit without load [closed]

I am attempting to create an induction heater for soldering purposes. The build involves a 24V/20A power supply, two 12 volt fans in parallel, a time delay relay and a ZVS board. I have fried multiple ...
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6 votes
3 answers
823 views

How is the CQFP64 package supposed to be soldered?

I am currently designing a PCB containing an ATmegaS128 with the CQFP64 package (see picture below and page 460 of its datasheet), but I do not know how it can be soldered. Can the golden frame and ...
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9 votes
2 answers
410 views

Mounting DIL8 package on SO8 footprint

As you might know, it is hard to get components these days. That's why we engineers have to get creative sometimes ;-) The company I'm working for has a shortage of a Zener-type voltage reference ...
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2 answers
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Is taping a safe and effective way of connecting lithium ion batteries?

I am in the process of changing the battery cells in my laptop battery pack and have to somehow connect lithium ion cells. I unfortunately do not own a spot welder and buying/making one for this ...
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Can you solder a cut female u.fl wire head to another female u.fl wire [closed]

I have broken my laptop's wifi card connector. The gold ring from the U.FL has gotten stuck in the female antenna. I am certain that I can get another U.FL connector back on the card but I am not sure ...
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1 vote
2 answers
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How can I repair peeled through-hole solder pads and trace?

The top and bottom through-pads were torn off in a botched desoldering. The bottom pad’s trace was peeled to the solder joint.
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1 vote
1 answer
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Cleaning after working with lead solder

I watched the YouTube section of soldering tutorials and had significant troubles when replicating on my own, even with SAC 305. I then switched to 60/40 and suddenly soldering became easy. I am ...
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1 answer
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Short circuit broke a P-channel MOSFET [closed]

I have an electronic board and I inadvertently made a solder bridge while soldering my circuit. This solder bridge is represented in blue on the picture below. After that the P-channel MOSFET ...
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-1 votes
1 answer
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What's the best way to solder these fine pitched connectors/pins?

During a replacement of a camera mother board, I managed to screw up one of the ribbon connectors, by tearing it right where the ribbon slides into female slot. I am unable to find any replacement ...
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1 answer
34 views

durable electrical splice/Tee to stranded aluminum wire

I need to modify a small battery jump pack cable, adding a Tee / Wye where shown below. I'm free to cut the cable here, too - i just haven't in case the right solution would benefit from it intact. ...
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1 answer
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Problem with solder-able Breadboard

I'm having a very strange problem with a solder-able breadboard circuit I built. I'm trying to track the frequencies received from a speaker with a microphone. Microphone from Digikey I've built a ...
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1 vote
3 answers
376 views

Is there a tool that allows precise soldering?

I was watching soldering videos and the tools (a soldering iron plus solder wire) seem very primitive. And the precision is terrible, a simple shake can move the tip of the soldering iron very far ...
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2 votes
5 answers
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Solder Won't Melt - I've Tried Everything.... Help?

I know "solder won't melt" is a pretty common issue, but after hours of research online I don't know what else to try. I've attached a couple pics to hopefully help. Scenario: I'm repairing ...
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3 answers
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Which resistor/solution should I use?

I have (had) an UPS which got wrecked during flight, I disassembled it and found something broken. I don't really know which resistor should I install or how could I fix it. The other resistors are ...
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1 answer
60 views

Soldering iron stands

A lot of soldering iron stands have the metal shaft of the soldering iron in contact with a metal part of the stand. Is this desirable, or should it be avoided? I've had a couple of those stands with ...
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2 answers
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What are these white/grey stains on the back of a motherboard?

I've recently bought a used motherboard and while cleaning it, I noticed these white stains on the back side of the PCB: I've managed to perfectly clean the front side with pure isopropyl alcohol and ...
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1 answer
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Mysterium Keyboard ATmega32a malfunctioning. "USB device not recognized."

I tried sourcing all the parts for this keyboard. I soldered everything up and when I plug in the keyboard I immediately get an error message "USB device not recognized": My first though ...
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0 answers
57 views

Tips to replace and soldering the battery connector in pcb

Tips to replace the asus rog gl703 8 pin battery connector, I think using a soldering station that shields nearby circuits with kapton tape and tin paste is a good idea to start with, the board still ...
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0 votes
1 answer
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Reflow soldering with temperature-sensitive components and without a reflow oven

I need to assemble and test a rather large (40x30 cm) board with single sided SMD parts, Sn Ag Cu solder (officially 217°C melting point). Usually I place group after group of components and locally ...
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1 vote
2 answers
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LM393 soldering station

I found on the internet and I built the schematic below. Then I tested with the oscilloscope and I found that when going from on to off and from off to on then some unwanted transitions appear on the ...
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0 votes
4 answers
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Best practices for soldering a larger wire to a smaller connector/terminal?

This is for a 24V 6.25A power supply. The power supply brick will feed into the connector then power a prototype device. What are the conventions or best practices to solder a wire to a much smaller ...
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1 vote
3 answers
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Should I use heat shrink tubing on solder connectors? [closed]

I learned soldering after IPC-J-STD-001 E during my apprenticeship 10 years ago and my instructor told me that you don't use heat shrink tubing on connectors, but recently I've seen a lot of this and ...
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10 votes
5 answers
1k views

ADC stops functioning when cold

EDIT: VERY INTERESTING TEST RESULTS I just tried inducing the thermal failure using an inverted "can of air" (likely difluoroethane). It even when its super cold, (might even be below -40C), ...
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2 votes
2 answers
366 views

How to use panel-mount connectors where the nut goes on the inside of the panel

Some panel-mount controls have the nut on the outside of the panel, like this: Other panel-mount controls have the nut on the inside of the panel, like this: With the nut on the outside, I first ...
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13 votes
5 answers
2k views

Why do the leads of some resistors have holes?

Why do the leads of some resistors have holes? Is it to: Run a wire through it before soldering? If so, what is the best technique? Run a tiny screw through it for connecting a tiny lug? Provide a ...
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0 votes
1 answer
64 views

Which flux type to use when soldering stranded wires that will be conformal coated?

I am doing a hobby project where I am weaving stranded wire through vias on the PCB. There is a matching copper trace and solder mask under the stranded wire. The stranded wire is soldered onto the ...
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1 vote
3 answers
92 views

Help resoldering SMD capacitor

I was cleaning my 1080 and installing new thermal pads when I accidently broke off a capacitor during disassembly. Does anyone have experience resoldering SMD capacitors on GPUs and if so what solder ...
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0 votes
3 answers
114 views

Soldering wires to non-plated pins?

Product: QSB35024S24 Images: An image of the product I'm working on. The image depicts pins -Vo,+Vo,-Vin,+Vin- these four pins are the troublemakers. A sample image of the product as it was soldered ...
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2 votes
2 answers
98 views

Wire in hole for pins with hole in them?

Looking at two of the three barrel jacks in the graphic, two of them (the upper ones) have holes in their "pins" or "terminals". When soldering to this terminal, should I place the ...
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2 answers
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Soldered lighting extension wire and offset from junction

I had to add extension wires (14 gauge stranded) from a 120v/50w LED light's main wiring (16 gauge stranded) to the junction box. I didn't solder them to the junction connection (I used Wago ...
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1 vote
1 answer
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What is this through-hole component holder used on aluminum PCBs?

I've been buying these cheaps LED lightbulbs and tore them down to see how the LEDs are driven. On all of them I have found this surface mount component that allows a through hole component (here a ...
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1 answer
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Soldering MEMS sensor

I have a problem with soldering the LIS2DH12 MEMS sensor accelerometer. I searched for soldering recommendations but I do not understand exactly how to solder. I couldn't find the needed heat and ...
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15 votes
5 answers
2k views

Can extra long pads cause problems?

I am a hobbyist and I find it very difficult to solder and work with SMD components which have very small underneath pads. I can't see when the solder flows, I can't touch the pads with the multimeter,...
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0 votes
1 answer
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Clone 862D+ soldering iron heating element

I purchased an ebay 862D+ rework station in 2017 and it has worked great. Recently I broke the ceramic on the heating element but did not break the element itself so I was able to get ohm readings ...
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4 votes
1 answer
123 views

What's going wrong with my solder paste / mask?

A short question this - I've got a board with a QFN-32 0.4mm pitch footprint, I ordered this stencil, and a tube of this solder paste, and the result is in the picture below. Now, I'm new to this, but ...
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1 vote
2 answers
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RTD lead-wire composition: choosing between silver or gold-plated nickel wires

I am selecting a platinum thin-film RTD for a sensing application. I have settled upon TE Connectivity's PTF Family. Within this family, there are two different options for lead-wire composition: ...
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1 vote
0 answers
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2 USB cable stripped wires vs black unstripped wire?

Here is my simple little project , I have bought these 2 very long cables, USB cables, but with time the micro USB side which you connect to devices has been damaged on both of them, the USB connector ...
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0 votes
2 answers
110 views

Soldering iron not transferring heat fast enough

I have an old KADA 852A soldering station. I can't find any info about it except on russian websites google translate helps. It is my retired Dad's station. It has not used for a few years (might be ...
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0 votes
1 answer
106 views

Can solder sucker tools release lead particles?

I have been desoldering a lot in my work. I use those manual spring solder suckers. I noticed that the opposite side of the nozzle ( the plunger, where the thumb goes) is impregnated with solder ...
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3 votes
2 answers
1k views

Storage of liquid flux

I have recently acquired a 1 L bottle of liquid flux. I only realised upon receipt that it is quite flammable and that I may not be able to provide the proper storage conditions. For now I have just ...
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2 votes
4 answers
204 views

Is it possible to solder leads from a JST connector directly to footprint on PCB?

I want to build a PCB for a charging circuit almost identical to the one shown here. I plan to hook up the circuit to this battery. According to the battery's datasheet, there's a 'JST PH 2-pin' ...
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3 votes
1 answer
271 views

Are these consistent dull joints an indication of poor solder?

Having nearly run through my stock of leaded solder I bought some leaded solder from a cheap supplier (Ebay). Thus I think I have bought dud solder: every joint is consistently dull. Whilst dullness ...
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9 votes
7 answers
2k views

How to solder a stranded wire to a THT hole of a PCB as shock-resistant as possible

I'd like to solder several stranded wires of a cable (maximum 18 VDC) to a PCB. I've got corresponding THT holes (⌀ 0.8 mm; it's the eight holes underneath the yellow wire,) but the wire is thicker (⌀ ...
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0 votes
2 answers
85 views

How do I fray/twist small wire reliably for soldering?

I accidentally severed a lcd monitor cable, and am not sure how to fray/twist them together reliably in order to solder it back? It's difficult to see all the strands, and not miss any, ime. Also, ...
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1 vote
0 answers
187 views

Brass vs copper sponge for cleaning soldering iron?

Brass sponges are liked by some for cleaning soldering iron tips Many of the product on Amazon describe themselves as having a brass sponge, but some reviews say that the sponge is in fact copper, ...
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0 votes
1 answer
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BGA reballing and reflowing, how to actually repair dead GPU chips?

To my understanding BGA reflowing is a technique which aims to reconnect bad solder joints on a BGA chip, BGA reballing is a technique to desolder and then resolder a BGA chip both aim to do the same ...
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0 votes
1 answer
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PCB Pad Replacement Help!

I am a novice hobbyist who destroyed a few solder pads while trying to remove a component on a small circuit board and need some assistance with repairing them. According to my research, you can ...
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0 votes
0 answers
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Altium - Clearance of a Polygon in Bottom Solder Layer

I created a polygon in the bottom solder layer , but it does not observe any clearance I even defined the rules specifically, but it does not work rules specifically I want it to be like this ...
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