 Some great search on the digikey site. So Leigh data, what are you going to talk about this week on your desk today? I'm going to talk about the lowly but important 10k through hole resistor because I was thinking about when we started a to food or I started a to fruit and we were selling kits and These kids were through whole kids because I didn't have a pick in place And so, you know, I'd sell a minty boost kit or a mini pop kit And it would come with a bunch of components including the circuit board chips resistors and capacitors So I had to source a lot of resistors And to get them inexpensively enough that I could make these kits and start a to fruit So I remember at the time, you know, I had to move from just picking up resistors at the local radio shack to like well how do I buy a thousand of these and You know, even then searching online or searching in a catalog for these parts was not easy Sometimes it's actually harder to find the most common parts. It's a common You know what quest people have is they say all I want is a bunch of resistors, but there's just too many options It's like I'm not I just want something simple and common And so I thought we'd kind of maybe do a throwback episode to to low resistor. All right, how's that sound? Yeah, sounds great. Well, let me show it on the overhead Some people know what I'm talking about because it's pretty small So this is your common, you know through whole resistor It's five percent. It's got a gold band You're not really going to see Through whole resistors are usually not going to be point one percent and then I'm gonna be ten percent the ten percent We don't really make those anymore because we can make resistors at at least five percent or better One percent are fairly common But I haven't like the five percent because I have the color codes memorized so I look at this and I'm like, oh brown black orange I know it's ten K or you know Yellow purple red, I know it's four point seven K Here's a little bag of like, you know resistors that came in in a kit with I think these are five point ones Yeah, five point one K and you get five of them But yeah, let's let's say you need a couple thousand of these resistors because you're doing a kit Are you doing an assembly? That's where you know, we saw resistors, but if you want to buy a thousand I'll tell people you don't buy them from Adafruit at 25 Parts per bag You want to get them from digikey because you can get them for like a quarter of a cent a piece so Let's go to the computer and we'll start this search They'll show you some tips and tricks It's now time for the great search at digikey. This is where Lady Aida goes to digikey site That's right and starts doing some great searching. I was at some nice graphics that we got there Yeah, this this is approved and we wanted to make sure that we show this is The search engine that a lot of people email and say hey Lady Aida I'm learning engineering, but I what I really need to learn is how to search and find the parts Yeah, and if you're an engineer like you know when you're in school They give you like a kit with all these resistors, but again eventually you need a bunch So let's just search for a resistor Why not and you'll see there's a cut there's you know a million reasons. There's there's like a there's a literally 1.2 million a million results. Um, you got it. You got it. I gotta pair that down a little less a little less But I want to show the different kinds so This is interesting so Starting from what we're gonna ignore these these are not related, but there's specialized resistors This might be like, you know ultra high temperature or ultra large or ultra small resistors Unlikely you'll look at those adjustable power resistors These are also not commonly used by engineers unless you're doing up, you know A power project you need a resistor that can say go from one ohm to five ohms and is like a powerful resistor It's basically a potentiometer, but it's or real stat, but it's very large there's the rotary potentiometers and Rio stats that's that's the common twisting up potentiometers You're probably familiar with might cover you some other time, but You know you can see a large range of different Potentiometers from you know the low-cost panel mount to Through a whole type and they can get pretty expensive like 10 turn or 25 turn resistors Some these are our five watt potentiometers There's the trimmer pots. So these are a little surface mount pick-in-place Potentiometers usually used with a small screwdriver to adjust a little bit of gain or an offset for an op amp say or an analog circuit Sometimes we use these to like, you know, if you want to adjust the amplitude of an amplifier or something You're not gonna be adjusting a lot. These are a little sensitive. So, you know, you don't want to twist them tons And then we're gonna get to The actual resistors because the pitch shalemators. Yeah, they're technically resistors, but they're really pensioners Resistor kits and I have one here These are kind of like a cool idea These resistor kits they'll come with like 20 to 100 different values and they'll give you like 10 to 50 a piece and It's not a bad idea to have one of these because Oftentimes, yes, you know, you want you have the exact value 10k or 20k But then once in a while you're like shoot I really need to like tweak this feedback resistor or this gain and I in a potentiometer is is too rough I want a closer value. So these kits can be a nice Alternative so, you know, they come usually in books or packs There's a there's two whole type So, let me see if they have Wire wound carbon film so carbon film is what's usually referred to as the There was you know, the rounded resistors. So, yeah, you can get 156 different values Five pieces, you know of half watt resistors for about 40 bucks so, you know, yaggyo has a kit and This looks like fun. This is a big kit. These are Like a hundred per that's kind of nice. So I do say, you know, in addition to getting whatever kits you need Having a resistor kit. I have one and it has come in very handy Okay, so But what we're really looking for is through whole resistors chassis mount resistors usually that's power resistors very big resistors for You know RF or power electronics So here we still have Half a million different options. So remember we want the 10k Resistors, so let's start the way I always start with active most of our active and So then it's kind of neat here is that you can you can like kind of go through here and pick out the values You can also do a range like maybe you're like, oh, I want something between nine and 12 kilo ohms So that's milli ohms ohms kilo ohms mega ohms and giga ohms. I want kilo ohms So then I can have a you know It's a little easier to scroll through because I'm only selecting from within the values that are close enough One reason why you might want to do a range For example, I was looking for like a 400 I did some calculation for a feedback resistor for an amplifier And I needed 450 kilo ohms well 450 kilo ohms does not exist Not every resistor value exists because the 5% resistor values Go up by you know 5% there's 5% between each one And so there's going to be values in between that don't exist That's why you'll never see like an 8.9 kilo ohm 5% resistor You'll find, you know 4.7 K 5.1 K 5.6 K But the values in between you're not going to find so that's why you might want to kind of get a range and then pick your tolerance now For through our resistors again, you're gonna see You could get point one percent, you know get much like point zero zero one percent Although I don't know how expensive that could possibly be but the more the more The sorry the lower the tolerance a the more precise the value is closer It's close as possible to the value you're purchasing You're going to pay more because they have to make all these resistors and they pick out the ones That are within that tolerance and not all them are going to make it so That means that you kind of want to go with the loosest tolerance you're willing to live with in this case We're talking about you know the simple 10k resistor standard pull-up I'm very happy with five percent. I Will know these are not in numerical order. So watch out. These are just goes for point one But then it goes one ten two twenty three. So just watch out for that So standard five percent They come in a couple different packings I will go with bulk packaging which means loose not on tape Some people like tape if you're you know cutting as a strip of Resistors, but the bulk ones just means you can pick them out of the box very easily So let's get bulk and then I'm going to actually say okay ten kilo ohms And yes, see not every value is available here. You'll see that it jumps up, you know from ten to Basically, eleven. There's nothing in between for five percent values And then you can choose the composition Metal film is usually more precise. They have different thermal properties at this point what you're going to be looking at is Temperature coefficient that is how much the resistance changes over temperature everything is a temperature sensor just some are better temperature sensors than others and The sizing dimensions But let's start looking at the photos to get a sense of what we have to choose here so one thing to watch out for is These are all obviously renderings. This is not a photograph of an actual resistor Compared to other great searches where there was actually usually a photo or Well often there was a photo of the actual object. This is a rendering so you have to look at the dimensions and the wattage to get a sense of how big it is now if you want a very tiny resistor It's going to be lower wattage can't absorb as much heat and Sorry admit as much heat to Stay within the The wattage range because it's a smaller bigger. It is the more heat it can absorb and emit In this case most two whole resistors are quarter watt when you're dealing with Large values like 10k you're probably not going to need anything larger than that They might be wondering well, if it really doesn't matter. Why don't I go down to? Eighth watt or or smaller and I'll tell you why is sometimes they're actually hard to read the values because the body of the resistor is so small so let's go to Power wattage and I'm going to pick one quarter watt Maybe one day we'll do a power resistor search and in which case we'll go go with a higher wattage And then I mean we can do in stock on only stocking so let's do a In stock and this is this is the resistor and this is I'm not surprising the yagiya resistors are what I've purchased a lot of 10 kilo ohm one quarter watt 5% axial Looks like this and they've got a ton in stock You can also get these in tape and box and tape and reel Again those come on on brown tape so you can cut strips off, but for most purposes This is what most people want Okay, now I'm going to go for super bonus round special lady ate a trick So you just found your 10 kilo ohm resistor and you're like, okay That took me like a minute or two But now you need like a 2.2 k resistor as well now you're going to start your search all over again not necessarily because If you look at the digit key part number It has the value within it 10k Qbk and D so my trick would be I don't actually search for it over and over again because again There's a million things to have to pair down instead Put in the part number 10k and then you can adjust this so let's say I want 47k type in 47 instead of 10k Hit return and boom You're there just I just saved you like two minutes that can be a valuable two minutes You never know what you might like what you might have done in those two minutes Ditto, let's say you want Again 2.2k in this case, I believe it's 2k 2 Maybe I'm wrong. Maybe it's 2.2k. Yeah, you search for 2.2k Qbk and you know again 85,000 stock lots available And this is what I would do when I was making kits as I would just type in The value for each one and then it would pop up and then I would just order any quantity nothing, you'll notice They they'll sell you one resistor But you're not gonna get good pricing at one one or just there's gonna be ten cents a piece, which is pretty expensive however, if you're willing to pick up, you know like at least a hundred it'll get down to You know two cents or three cents so you can pick up like a thousand resistors for eleven bucks or 250 resistors for five bucks And that's really great if you're again doing kits and you want to have good pricing if you're picking up a tape in real Which is you know this on a real the pricing is really low because they're like oh, we're gonna give you a box It's less than a cent You have to buy five thousand, but it's less than a cent so Keep that in mind if you're if you have to buy a quantity it might be worth it just to get a full box Instead of individual ones and counting them out and that is My great search for today. I hope you learned a lot