 That's right every single week we do the great search with digikey. This is where Lady just shows you how to use the digikey site To get exactly what you're looking for and this week our example is this cool speaker. Yes. Okay, so let's go to the overhead I'm gonna show sorry the computer mistake So this is the speaker that we're using it. It's like this little square speaker that we pick in place onto our PCBs and There's basically two kinds of speakers that we use in general We use either piezos or we use magnetic buzzers and it's confusing and even to me It's like sometimes it's hard to tell if something is a buzzer or a piezo and they're both called buzzers So once like a piezo one's magnetic, but they both beep or buzz and also within those types There's ones that are like set tone like AC input DC input it can be like quite confusing and so I thought I'd show people Some techniques to get your own the reason I like to use the magnetic buzzers compared to the piezo buzzers is These piezo buzzers cannot be surface mount pick-and-placed right there. They're through a hole Soldered onto a PCB. They're very inexpensive. They don't require any extra driving circuitry You can connect this up to a microcontroller with like a 20 milliamp output and it can like beep nice and loud However, the piezos really are tuned to just one frequency They're not, you know, they're usually like a two kilohertz or four kilohertz. You can send them any Frequency, but they really they're really only good to like a certain small range. That's usually between one to like eight kilohertz And they're shrill. They have a square wave, you know, they're either on or off There's not a lot of subtlety to using the piezo words and magnetic buzzer is actually like a little speaker and You can you can send it Sign-ways it will sound a little bit better And you can send it, you know Wave forms and you can get slightly different tones. It's not as good as a big speaker or even like, you know the ones that you put in your Your your your AirPods or your earbuds, but it's basically the same idea. They're same as the ones that are in Earbuds or headphones compared to the piezo buzzer, which is really meant for like making squeaks so let's go to digikey and So there's two Kind of buzzers, right? You either want to get the piezo buzzer Some people press piezo in different ways and I don't even know what's like pizza or pizza. I don't know I call them piezo Maybe I'm wrong And so within that there's a couple of things basically there's you can get the raw elements and what's funny is that you always see this when you open up and a Multimeter because they're always a kind of or like other device that has a built-in alarm clock They'll have these, you know, basically like built into the body of the electronics and then they have two contacts So there's a little piezo discs when you put an AC current across them They vibrate that vibration turns into sound These are Extremely inexpensive in quantity easily down to like 10 15 cents or so But again, you have to these are kind of built into the body of the device you're building There's also these versions. That's kind of what I was showing you in the Adafruit shop They have two pins the piezo is that flexible disc is inside this plastic piece There's two pins that come out. They sometimes they have wires. Sometimes they have mounting tabs, you know, all good stuff and then There's two kinds to watch for which you can see here. There's single tone That have DC input Actually the single tons little confusing. I'd say there's there's DC and there's peak to peak So if you do DC, it basically means that you give it a You give it a voltage and it just makes that tone you don't have to give it a square wave it just like Does its own thing it's internally driven and I get this is called like an indicator Because you say face the tree like an LED when the pin is high screeching noise comes out of it pin is low It's nice and quiet compare that to an externally driven transducer where you have to provide it with AC signal That might not be a big deal I mean like you're gonna usually pay a little bit more for the internally driven indicators because they have an oscillator Maybe you want to you know, and then you don't have any control over the pin frequency like the audio frequency Whereas externally driven ones you can you know, it's a very common thing with an Arduino or my controller You draw drive it from a pin or maybe with a transistor buffer and you can give it You know a couple different ranges of frequencies. So that's that's kind of nice But again, these are hand soldered or bulk or they come with wires I mean there they can be plenty loud But they're just fixed in their capabilities So if you don't want a piezo buzzer, the other option you have is a magnetic buzzer Here's a question ask the question these buzzers only generate square waves for piezos. Yes You're the only it's really a square. I mean if you drive with a triangle wave it won't It doesn't sound like a speaker where you'll actually get a different feel for it Or at least no piece of I've had every piece of I've had it's always been like You put you push it with a square wave a sine wave wouldn't do anything to sound different It's it's like the movement back and forth. It's like a voltage Difference that causes it to flex but that flex chair isn't subtle Compared to like a magnetic speaker where you know, you can push the air a little bit or more You can you're a little bit more. You have a little bit more control. Although I'll say not a ton It's like these little buzzers. They still don't they're not they're not really speakers. I mean they are but they're They're very minimal right like you you can Play chiptuny sounds or very simple sound effects with them not not good for Losing to really subtle music or lyrical music the lyrics would not come through Okay, so next up. All right, so you look for magnetic buzzers And this is still in that same section. They're kind of mixed. That's the thing you have to watch out for piezos and magnetic buzzers They end up being in the same Same category So let's go for active and in stock items and then again There's there's the kinds that are externally driven internally driven. So we want the externally driven ones Because we want to provide, you know, the sine wave or square wave or whatever wave And then you know, you can get these as like speakers and this is Really like a speaker and these are like, you know This was a single tone. So let's get ones that are not single tone Let's go for continuous and let's go for ones that are rated for like up to five volts or so Okay Great now we're talking so yeah, so like some of these it looks like a piezo like it has the pins But this is actually a magnetic buzzer. It's what I'm telling you. It's like this is a great confusion But the speaker that I like is this one So it's you know, you can get bigger ones They cut you know, you can get ones that are like this extra. This is the five millimeters This is the one used on the clue and then there's a couple different ones that are the About eight millimeter square So let's actually filter down to get to the ones that are about eight millimeter The promise is like diagonal and then they're square, but we want You know about seven seven point five To eight point five so supply. Okay, great. So now we're Really zoned in so yeah, there's there's a couple different makes I will say that these are a little generic Nobody owns the idea of having like this square Speaker So you can get them, you know, this one has a top port and this one has like a side port This one's like really tall This one is a small photo, but it's basically the same idea and You know, you can sort by price if you care Let's just say 500 and then so, you know under a dollar what's nice about these I'll tell you the thing I really like about these first off. They're nice and flat They're durable. I've never really had one break and They're pick and place of all which of course, you know, just for me Manufacturability is worth it. Like yes, it's it's going to be much more expensive than a piezo It's like two or three times more expensive than a piezo However, I like that it's pick and placeable and that I can play little sound effects on it that sounds a little bit better than a piezo element speaker, so That's why this is the great search item the cmt 7525 so 75 7.5 by 7.5 millimeter and I think 2.5 millimeters tall As seen on many of our most favorite products All right with that is a great search