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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54 views

How does one reuse a thick film circuit?

I have a thick film circuit from a calculator that I want to use. How can I attach external connections to the sheet? I tried simply using the circuit as a contact in between a battery positive and an ...
2
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1answer
73 views

Best way to short these pins?

The pins that the arrows are pointing to are for the power button on my camera. If I take a small piece of wire and touch the two leads (they seem microscopic), then the camera turns on and off. I ...
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1answer
97 views

How do I solder a LED in place of an earphone?

I have a super basic bluetooth headset. I've taken off the earphone, and want to put a very low power, basic LED in its place. I plan on just soldering the anode to the red wire and the cathode to ...
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2answers
244 views

Using copper clad for RF projects

As a novice reading "Build Your Own Transistor Radios" by Ronald Quan I was kind of mystified by the author's statement that using "vector" board would be easier than using prototype boards, but the ...
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1answer
39 views

Visaton speaker, how to wire up [closed]

I just got some Visaton speakers in the mail. But I'm not sure how to solder on the + and - wire. There are four solder blobs (as seen in the picture below). To which ones do I solder?
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1answer
74 views

Why would solder paste not wick in completely during reflow?

I'm using a hot plate to reflow a PCB. Aside from a rather egregious amount of solder paste (this was the second time around, and somewhat intentional), why would solder paste, at temp, not wick in ...
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3answers
120 views

Played with some lead solder without washing my hands for awhile, should I be concerned?

I was using some lead solder at work, and wasn't aware it was lead solder nor had anyone told me that it can be dangerous. For the most part I was just handling it. This was last week and I don't ...
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1answer
54 views

DIY SMD - options for covering exposed vias?

I printed a PCB + got a kapton stencil made for a project I'm working on. One of the components is a BGA chip, and has vias close to the bga pads. The vias on the board don't have solder mask on them, ...
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5answers
644 views

Thick vs Thin Sponge for Soldering

After purchasing a TC205 sponge and comparing it with the default sponge that came with my soldering station, I noticed that the TC205 sponge is very thin in comparison! Is the thin sponge used for a ...
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1answer
139 views

Circuit working in breadboard but not perfboard

I am making a circuit to unlock my car doors. The central locking in my car works with 2 wires one at 12V, the other at 0V. When the 12V line is pulled low, the door locks. When the 0V line is pulled ...
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3answers
91 views

Easy Soldering to Aluminum?

I am building an antenna with aluminum elements. Is there any easy way to solder copper wire to the aluminum? I do not need a very strong connection, just a good electrical connection so I can then ...
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2answers
63 views

Loose connection when attaching an Arduino shield with header pins

I am adding this Spectrum Analyzer shield to my Mega: Using these header pins: The square pegs of the header pins are worringly loose inside the holes of the shield. I know soldering is an option, ...
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2answers
107 views

Lead Free Soldering and bad looking joints

For years I've been soldering with normal Sn60Pb40 solder wire. But now I try to switch to lead free solder. In many forums over the internet I found the Amasan BF32-3 solder wire. It's a Sn95Ag4Cu ...
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1answer
74 views

I've just bought a new Soldering Iron with the intent of making Art, however I seem to have a problem [closed]

I bought this: http://www.amazon.com/Weller-SP40NKUS-Medium-Soldering-Black/dp/B00B3SG7F0/ref=sr_1_2?ie=UTF8&qid=1394083021&sr=8-2&keywords=weller+soldering+iron The other day so that I ...
6
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2answers
142 views

Soldering guidelines for freezer applications?

I'd like to do a home project where I take temperatures inside of my freezer and inside liquids. Liquid-compatibility aside, I'm mostly curious about whether or not anyone can recommend some best ...
2
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1answer
68 views

Heating and Chilling ICs instantly from 200C to 0C? Does it damage the silicon inside?

I soldered VCXO oscillator and suddenly tried to cool it down with a cooler spray. Do you think that sudden cooling and heating damages the chip. The heating and cooling were well within the spec ...
2
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4answers
518 views

Advice Needed On Removing Stubborn Circuit

I'm new to soldering and I've done some research on what I need in terms of material and tools and what I need to do in terms of removing and replacing a circuit. The circuit I'm replacing is a Laptop ...
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1answer
184 views

Soldering underside pads of Teensy 3.1

I have to place this Teensy 3.1 on a PCB, I am planning to make the PCB such that it has headers on which the whole Teensy will fit. Essentially, it is similar to making a shield like we make for ...
3
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1answer
157 views

How to solder a connector when spacing of PCB pads is not equal to spacing of component pads?

After delivery of my PCB, I realized that the spacing of PCB pads is not equal to the connector pitch (the PCB footprint is bigger than the OLED connector)! (sad) Look: Any idea how to solve this ...
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2answers
81 views

Soldering to large metal case

I'm trying to solder two noise filtering / decoupling capacitors to my small motors. One from each of the tags / motor terminals to the motors outside case. However it is just not working at all, the ...
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1answer
61 views

Placing UFL connector in 3G dongle

I purchased a 3G dongle from an unknown manufacturer (ZD Incorporated), and I am trying to boost its signal with a 3G antenna. I'm on the assumption that the manufacturer did not put an antenna there, ...
2
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2answers
88 views

How solder inductance affects RF circuits?

I'm assembling a VHF oscillator (90 MHz) and plan to reach UHF and SHF some day. Should I worry about solder inductance affecting an oscillator performance? If no, then when should I take it into ...
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1answer
52 views

How should I wire this stereo jack for a mono plug? [closed]

I have two of these stereo jacks that I am planning on using to rewire some headphones that have had the original cable fail somewhere between the speaker and the end plug. Instead of bothering to fix ...
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4answers
94 views

Specific solder wire/flux questions

Sometimes you have to try something and have it not go well before you even know what questions to ask. This is one of those times. I recently soldered header pins to a 2x16 LCD display. This was ...
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2answers
382 views

Third hand damages insulation

My third hand damages wires insulation because it's holding them too tight. Any tips how to avoid this?
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2answers
117 views

Soldering iron tip won't work

I've been going through my third soldering iron this weekend. I already bought two and took one back to the shop. I'm in the middle of a project and the tips keep failing: the lead-free solder won't ...
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1answer
59 views

Use for trackless / bare stripboard?

I've seen a few stripboards laying around that have no copper tracks. After looking online I can see that you can indeed buy these but I can't seem to find why or how to use them. How can you use it ...
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1answer
85 views

Identify and replace a resistor [closed]

My APC UPS stopped working. I have had it for many years and it was serviced once by APC while in warranty and never opened again. Now since it is not in warranty anymore I opened it and saw two ...
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1answer
57 views

Component polarity markings [closed]

Ok, I have my capacitor 4700 mikes should more than do the trick. I have my diode, soldering iron, jumpers and leads. Then I realized its been so long since I've installed solid state components I ...
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5answers
280 views

Any tricks to attaching a wire or pin to a testpoint?

More and more often, I find myself needing to tear apart a device to seek out and connect to serial pads. These pads typically give me access to the underlying operating system for research or ...
3
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2answers
167 views

Ceramic capacitor value changes after soldering!

I am debugging a power amplifier circuit and trying several capacitors values to fine tune the design to meet the frequency response specifications. All the 0603 and 0805 ceramic capacitors are ...
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1answer
89 views

Is it possible to hand solder a component with a peak temp of 250 C?

I'm trying to mount an RF module that has 33 edge castellation pins. The data sheet says that the peak temperature is 250°C. I'm using 60/40 lead solder for a lower melting point but the solder will ...
2
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1answer
85 views

Are thermal reliefs on SMD pads beneficial when reflow soldering?

I know that thermal reliefs have benefits when hand-soldering through-hole components. For some high-frequency or high-current components, I understand why it's a good idea not to use thermal ...
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1answer
114 views

Possible Homemade RCA to Aux

I'm going to flat out say I'm a programmer with a soldering iron. So, if I sound like I don't know what I'm talking about; take this into account. I was browsing stores for an RCA to Aux converter. ...
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3answers
158 views

Removing solder effectively

I have an Epihpone (Les Paul 100, fairly standard) electric guitar, which over the years have gotten to suffer from a non-functioning bridge pickup. I verified this using an ohm-meter, the result ...
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2answers
85 views

Isolate wires soldered on PCB

I'm soldering some cables on a PCB. They are are stranded, so I've first apply a bit of soldering on them and then solder them on my pcb. The problem is, there's on some a bit of exposed copper on ...
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2answers
107 views

TONS of adhesive on Blown capacitors. Try to replace or swap in NEW BOARD? [closed]

I've read the HELP CENTER > ASKING page. Not sure where I stepped out of bounds in the original post, but I've reduced the content to the following in an effort to comply: At issue is the IP ...
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2answers
2k views

Soldering a VGA cable - number of wires doesn't match [closed]

I decided to open up a VGA cable which started to produce only red / blue / green colored image. I thought that inside I will find something like shown on this scheme: Instead I found that my VGA ...
9
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3answers
243 views

How do I work out what temperature to use when desoldering?

I have a temperature controlled soldering station, and know that I need to set the temperature appropriately for soldering based on the solder I use when soldering, but how do I determine what ...
2
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0answers
166 views

How does this prototyping style work?

I'm a little puzzled about a prototyping style I've seen used recently. Here is an example picture of a circuit made in this way: Can someone explain the process of making a board like this? Why are ...
1
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2answers
80 views

What do I do with the “shell stakes” on connectors?

I've seen a few connectors with "kinked shell stakes" (example). It's probably obvious but what are they for? Are they somehow soldered to the board or do they wrap around it? Should I drill holes ...
0
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0answers
93 views

Soldering flexible plastic connector

I have an LCD module that looks like this. I need to solder it directly to the PCB. The problem is that the metal contact/PCB pads aren't exposed, rather covered by the dark brown material. Any ...
1
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2answers
139 views

Easiest way to solder connections to all the legs on a surface-mount chip?

Recently, I went through the process of soldering wires onto the legs of a TQFP chip (~0.8mm pitch) which has already been mounted on a PCB. This is a project where I am doing some modifications to ...
2
votes
1answer
94 views

Soldering a wire onto a metal sheet

Does anyone have suggestions for soldering a wire onto a thin metal sheet? I tried soldering directly by placing the wire and adding some solder over it, but the wire keeps on getting separated from ...
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votes
3answers
131 views

Which part of PCB circle for capacitor is positive? [closed]

I have a Creative speaker board for repair. I'm confused with replacing the capacitor. I have desoldered the capacitor and brought a new one. The circle in the PCB which represents the cap has a dark ...
2
votes
2answers
111 views

OK to tin soldering tip prior to shutdown? [duplicate]

I usually clean my soldering iron's tip before turning it off. Yesterday I read an article where someone suggested to tin the tip before turning off the iron. Is this a good idea? And how would it ...
10
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2answers
252 views

How does flux work, chemically, and what are the products?

Ususally, electronics solder comes with a built-in flux core. Among the solders I have laying around, I have a silver/tin solder with an "F-SW-21" flux core (ISO 9454-1: 3.1.1, this is zinc chloride ...
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2answers
185 views

How is this OLED cable being soldered to PCB?

In this video, from around 4:18 onwards, you see the cable of an OLED display being soldered. How is this soldering happening; i.e., how does the solder "flow" to the PCB pads given that the ...
1
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1answer
50 views

DC gearhead motor broken - too much heat on terminals while soldering?

I am building a line-following robot using two of these motors: Motors I had everything on the breadboard and it worked fine - including both motors. Then I built the circuit, soldered wires to the ...
0
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3answers
88 views

Is it ideal to solder joins by placing the solder first on the component, and then having the soldering iron on top of it?

I know the proper way of soldering wires and other components on PCBs and breadboards is by first heating up the joint with the soldering iron and then feeding it solder. However, the breadboards ...