 The Great Search, brought to you by Digikey and Adaford. Thanks, Digikey. This is the time of the week, every single week, when Lady80 is their power of engineering to help you. Yes, you find the things you need on digikey.com. Lady80, what is this week's Great Search? I'm glad you asked. So this week's Great Search is, I just made a breakup order for the DS4420, which is a really adorable mono audio amplifier with I2C volume control. So it's analog volume. You have analog in and analog out. But then in between, you have an I2C level control, which is kind of handy. You don't want to have a volume knob and you don't want to go digital and back out. It's fairly inexpensive. And as I was working on it, I was like, ah, you don't be really cool if there was a stereo version. So I was like, let's find a stereo version. So let's go to the computer and I'll show the DS4420. So this is, there's only one in stock because I just bought a bunch. I've learned my lesson. I don't do a great search and show something cool that I need without me purchasing the number that I need. So I bought up a bunch, although they'll be more available soon. So the DS, look at this up, the datasheet. So this chip, like I said, it is an amplifier for audio applications. It has iSquared C out, sorry, iSquared C control, three address pins, audio out, audio in, differential, you know, analog ground. And then when you go down, down, down, down, down, down, you can see basically there's like a control register. You can set the gain, mute and stand by. So handy, but again, it's mono. So I wanted to find something similar, but stereo instead of mono. Also like, wow, 74 weeks, nuts. All right, so let's go to audio amplifiers. And so this is interesting because what I want, especially the iSquared C control part is a little bit weird because there isn't like an interface box, right? If there's a box here that said like, okay, SPI, iSquared C, whatever, but there isn't. And so we're gonna have to use, kind of, I used a new technique to find this part. So let's start with active and preliminary. So I only want stuff that's out or about to come out. Okay, great. So there's now 2,000 parts. So next up, you know, there's this long list and you see they all have like features. And again, the feature I want is iSquared C, but you know, they don't, it's like there's no way to search for just iSquared C. So what I did is I tried, well, what if I just put in the filter here? And that was good, except that because you see there's a sort of like superscript iSquared C, it didn't come up in the features, which is something I'll tell DigiCue they should alias. So instead, I went down here and I found the superscript 2 and I went back up here and then I changed this to filter on these. And then I'll say that, you know, there's some of these are i2S and you know, I kind of tried to remove as many as I could of them because I don't want i2S, I want true analog. And again, that's not a searchable thing, but I also didn't, I kind of didn't care too much because there weren't that many. And this is good enough. Okay, so apply. So those are 200. Next up, I remember I wanted it to be stereo. So definitely don't want mono with mono headphones. I don't want one channel, I want two channel. Stereo, stereo, stereo, stereo. Okay, cool. I'm gonna apply this filter. All right, great. Now we're talking. So the other thing that came up as I was searching is there was a lot of BGA parts. And I like, I had enough stuff going on in my life. I do not need to throw a BGA, I mean, I get it because it's like they're meant for like headphones or like portable things that need to be very small. I do not want BGA. And so I'm going to make sure that I select only the non BGA parts. So T-Sops, okay, and QFN, no BGA, no BGA, no BGA, no BGA. I mean, I'm not gonna get some of those 99 pins anyways, but I just basically did no BGA. And that gives me down to 31 parts. So now I'm really looking at only the things that are available. Now most of them seem to seem pretty quite a few in stock. So let's look by price. So there were a couple. So this one was kind of nice, it's not in stock. So I kind of, you know, it does do, which isn't the tin, it's a class AB. So it's an audio amplifier with I squared C. You can see it has a little headphone and there's audio in and there's I2C. So it's analog, analog. And then if you scroll down, you know, they tell you the volume also has basically just volume control. And it looks like there's like a bass boost you can turn on too. So you can turn on, you know, non-linear gain so that the lower frequencies have a little bit more of a boost, which kind of sometimes helps with cheap headphones that don't have low frequency response. Bad news is not in stock. And who knows when it will be in stock. So that's where I found, this wasn't too bad. It's like, you know, dollar and tape and reel. The TPA6130. So this part, looks not too bad. One thing I liked about it has wide power supply. It has the audio, 64 step audio, taper, it comes in QFN and BGA, but I don't have to do BGA, do QFN. And, you know, it's a pretty simplified schematic. It's not too complicated. So the thing is that you have a little charge pump inside, probably to drive that headphone and get it, I wonder if they have a false ground. Yeah, they do a false ground. So it really is meant for headphones. There's no blocking caps because it lifts, it just makes sure that the headphone output is centered around the grounds. There's no DC offset. So that's actually kind of a nice design. And then if you go down, they also show you, hey, you know, here's what, here's how we do it with the bias voltage versus having it ground centered. Audio taper, you know, basically they do nominal DB gain to looks like negative 100 to 4 dB. And you just program, you basically just like write the register. Not a lot going on. Let's see, there's a few registers. Looks like you can mute each left and right, and you can set the volume. So you have basically four or five registers, very simple, but very effective. Actually really like this design. So I think I'm gonna go with this one, the TPA 6130, that's what I want. It's I squared C, voltage range, no cap required on your output, headphone drive, and stereo input and output. This is my pick. That's great search.