Articles

How to Solder properly || Through-hole (THT) & Surface-mount (SMD)


if you ever watched one of my project videos and thought to yourself this guy has no clue what he’s doing I have to prove him wrong then you had no choice but to gather the required components and connect them to one another on a piece of proof porch according to my schematic the process which we use to reliably connect components jumper wires and practically everything else in the circuits is called soldering and no matter whether you create an old-school circuits with through-hole components or solder itsy-bitsy surface mount components to a PCB there exists useful guidelines which make soldering a breeze so in this video I will present you my technique for both tht and SMD soldering tasks which up until now were never failed me let’s get started first off let’s have a look at tht soldering aka a through-hole technology around 99% of my credit circuits use this technology since it is very simple and accessible the thinks we need for it are the following a piece of perf board with copper lines or dots I personally prefer dots though since you can create more complex layouts on a smaller area the THD components according to the schematic of the circuits which you can always recognize by the long leads which according to the name of this technology push through the holes of the probe boards and are soldered in place on the other sides and last but not least a soldering iron or even better a soldering station with a screwdriver tip or a conical tip as well as obviously a bit of solder I recommend using solder wool of flux core sinces removers the oxide coating of the metals and thus creates a strong bond and a shiny surface while flux free solder is certainly a bit harder to work with since we got everything ready for soldering can turn on the soldering station heat up the iron to 350 degrees Celsius and positioning the heart of the circuits dat tiny 85 in the middle of the purports the package the IC uses is called tip aids which stands for dual inline package and the eight represents the number of pins this dip package is pretty popular with tht and only distinguishes itself but through the numbers of pins used but the soldering technique always stays the same first off we have to bend two pins on the copper sides so that the IC is stays in place then we bring our iron close to one pin heat it up as well as the copper pads for 1 seconds and it needs Leah bringing the solder from the sides so that the flows around the pin before we move the sodomy ayran after cooling down the solder joint should have a shiny surface which means we can continue by utilizing the same technique to solder the rest of the pins to the purport one thing that we miss there were is the fact that you usually do not directly solder I cease to a purport it is actually recommended to use sockets so that you can replace the ICEA in case it blows up so to remove the ICEA from the perf boards I like to use so-called solder wick which is basically copper wire coated with flux to use it we simply lay it on top of a solder joint the play pressure with the hot soldering iron and wait until we see the facts come out which means that the solder wick sucked up the Sola this way we can easily remove the ICEA and replace it with the sockets which we solder in place the same way s di see now the rest of the components all follow the same soldering scheme which is push the leads through the holes paint them on the other sides quickly heat up one leads and the copper round its bring in the solder and let it rip low for a second before letting it all cool down and once enough components are in place we can use simple solder lines or jumper wires to connect them to one another then we can repeat the process by soldering in more components and then connecting them until the circuit is complete and if you think that this sounds rather simple then you are absolutely correct because it only takes a bit of practice and patience to master the arts of tht so now that our FUBU circuit is finally complete we can have a look at a boost converter which except for its potentiometer only consists of SMD components SMD is stands for surface mount device which means there are no leads which pass through the circuit board instead the components are directly soldered onto the surface of the PCB that means the process of placing the components on the PCB and soldering them can be completely handled by a machine another advantage of them is their very small size which is mandatory for circuits that need to fit in your pockets and if we have a look at the slide polled charge protect boost PCB that I created we can discover the last advantage these circuits consists of four different ICS which if we look at their data sheets only exists as an SMD package that means if you want to use the newest IC technology you should get familiar with SMD here or get out it’s as simple as that so let’s bring in the components for my circuits and let’s get started soldering I always like to start with the Schottky diodes and the inductor since their solder pads are located underneath them so that traditional soldering is pretty hard to do instead we can use so-called solder paste by firstly securing the PCB to the workplace we can squirt a tiny bit of the solder paste onto the solder pads push the components in place booboo tweezer and then grab our hot air station by selecting a temperature of 300 degrees Celsius and the medium wind speeds we can heat up the solder paste until it turns liquids and then into the usual solder which pretty much automatically sticks to the component and solder pads and locks it all in place no of course you could use the solar paste / hot air technique to solder all the components to the PCB and the results would even look better than with a normal soldering iron but I still do not favor this methods the reason is that you can more easily overheat the components in my case I destroyed my boost converter IC which I had to replace before the boards could function correctly so let’s use the soldering iron and stats hoo screwdriver tip I replaced with a very fine conical tip when it comes to SMD components with two terminals like resistors capacitors and LEDs we firstly tin once older pets move the component to the pet booba tweezer and reflow the soda so that the component gets secured then solder the other side in place and add a bit more solder to the side we started with afterwards we can repeat this process for all the other two pin components once again practice is everything and as you can see I do not have the steadiest hand but even like this it is no problem to solder SMD for further resistance you can even use a microscope like I do right here which makes soldering a lot easier but even without it I successfully sold out a complete boards which afterwards functioned without a problem next we cut the SMD ICS which I talked about earlier my technique is to tin one solder pads position the IC with tweezers while utilizing this pads to lock the IC in position and then simply sold out the rest of the pins in place just like we did with the through-hole IC of course the smaller u IC gets the more difficult it becomes to Sol door opens properly but once again the technique stays the same it only takes a bit of practice last but not least I sold out the microUSB port and the switch in position and our SMD circuit was complete but we have not faced one of the more popular SMD packages yet the Chi QFP aka thin quads flat package your Arduino Pro Mini or Arduino Nano for example consists of one of them to solder them you must firstly align them with a diagram on the PCB you then solder one pin in place and get the AC in position just like we discussed it earlier afterwards we can solder one pin on each side to the PCB at this point we should get ourselves a flux pen which we can utilize to flood all the pins of the IC in some additional flux then we add a ton of solder to all the pins so that they are basically all bridged on the corresponding sides and finally we can use solder wick to remove the excess solder and afterwards utilize the cotton pads with some isopropanol to get rid of all the excess solder material on the PCB and just like that you can easily solder an atmega further to a PMAC controller to your PCB without creating any shorts now the last SMD package we want to have a look at also comes in the form of an esp8266 IC which are removed from its breakout boards woofer there as you can see it has no leads only contact points on the bottom sides that is why this package is called qnf aka quad flats no leads but surprisingly soldering it to PCB is pretty much the same process as before but the G QFP the only difference is that you cannot easily see you bother your solder connections were successful or not in my case I did a pretty horrible job right here but anyway with that being said you are now ready to solder all kinds of through-hole and surface mount components and if you want to use the same tools / materials as me then you can check out the video description well listed all of them as always I hope you enjoyed watching this video if so don’t forget to Like share and subscribe stay creative we’ll see you next time

Leave a Reply

Your email address will not be published. Required fields are marked *