Mixed Signal Development

Mixed Signal Development A Swiss start-up revolutionising learning with electronic kits.

30/09/2026

Your Bluetooth speaker plays music using square waves 🔊

Audio amplifiers don't just take your music and "make it bigger." Here's what a Class D amplifier actually does:

1️⃣ A carrier wave at a few hundred kHz is compared against your audio
2️⃣ Audio above the carrier → 1. Below → 0. The result is a fast square wave that follows your music (this is PWM, pulse-width modulation)
3️⃣ That low-power signal switches two MOSFETs on and off → the same square wave, at much higher power
4️⃣ An LC (coil + capacitor) low-pass filter smooths it back into a sound wave

The MOSFETs are only ever fully on or fully off, so almost no energy is wasted as heat. That's why Class D is inside smartphones, TVs and Bluetooth speakers.

The board in this video is a fully discrete Class D amplifier. There's no chip doing the work and no black boxes. You build every stage yourself, because that's the only way you really understand it.

Want more info about it? Comment LEARN and I'll send you the link 👇

10/09/2026

I'm an electronics engineer, and this is my most exciting project yet — a fully open-source, self-contained LoRa communication device. 📡

LoRa lets you send messages over huge distances — some people have hit 50km — on almost no power, with no towers, no internet... So I teamed up with and designed this board: a LoRa module, microcontroller, screen, buzzer, haptics, battery management, and a navigation joystick — all in your hand.

This is Part 1 of the build, but stay tuned, because there's more coming

👉 Comment "LoRa" and I'll DM you the full open-source project files + the JLCPCB link.

Follow so you don't miss the rest of the series. ⚡

30/06/2026

I2C pull-ups — everyone tells you to add them, nobody explains why.

The I2C lines use open-drain outputs. Unlike regular digital pins, they can only pull a signal LOW — they can't drive it HIGH. Without a pull-up resistor connecting the line to your supply voltage, the signal floats when nothing is pulling it down. Undefined. Unusable.

The pull-up fixes this. And the open-drain design isn't a limitation — it's intentional. It's what allows multiple devices to share the same two wires without ever conflicting.

The value matters too: too high and the line rises too slowly at speed. Too low and devices can't pull it all the way to ground. 4.7kΩ is your starting point at 100kHz.

Once you understand open-drain, pull-ups stop being a mysterious rule and start making complete sense.

21/06/2026

We feel so incredibly honored to be part of this amazing maker community.
Thank you to everyone who has made this weekend unforgettable!ch

20/06/2026

We are incredibly honored and beyond excited to be at today. 🇨🇭✨
If you’re around, come by, say hi, and check out what we’ve been working on.

MixedSignalDev

10/06/2026

I created my own educational electronics company. And in less than 2 weeks, all our kits will ship to the EU for the first time.

MSD is based in Switzerland — which is in Europe, but not part of the EU. That brings a lot of obstacles: customs, taxes, logistics. Things I had absolutely no idea about as a solo engineer-founder.

After weeks of searching, we found the right partner. Preparations are already underway. All EU countries, live within 2 weeks.

If you're in the EU — where are you from? Let me know in the comments. I want to see where our first EU orders come from.

08/06/2026

This analog circuit has a gain of 1. It doesn't amplify anything. And it's everywhere.

Every voltage source has an output impedance. When you connect a load, you form a voltage divider — and your signal drops. The voltage follower solves this: very high input impedance so it doesn't disturb your source, very low output impedance so you can feed anything downstream — another amplifier stage, or an ADC directly.

One of the most fundamental building blocks in analog electronics.

Have you used one in any of your projects? Let me know in the comments.

03/06/2026

Three months ago I started MSD to fix a problem in electronics education.

We just received our first invitation — the Maker Faire in Solothurn, Switzerland, June 20th and 21st.

We'll have two free workshops open to everyone:
🔧 Soldering workshop — show up at any level, we give you a PCB that matches where you are, and you build it.
📡 Measurement workshop — learn to use the tools every electronics engineer relies on: oscilloscopes, spectrum analyzers, multimeters.

If you're in Switzerland, come find us. It's completely free.

I did not expect this to happen so fast.

01/06/2026

The first thing most people do when they want to learn electronics is search Google — and follow kit after kit after kit.

But following instructions isn't the same as learning. After 5 kits, you can follow steps. You still can't design anything.

I had this exact problem 10 years ago. It's what led me to start MSD.

The idea is simple: with every MSD project, you don't just build — you understand how it was designed and why.
Insights into an engineering brain. And with each project covering different parts of electronics, you build up everything you need to create whatever you can imagine.

This is what I wish had existed when I was starting out. 👇

28/05/2026

Every year, designing beginner-friendly kits gets harder.

The electronics industry is moving toward smaller, denser components — which is great for product engineers, but a real problem when your customer is holding a soldering iron for the first time.

USB-C is the one I keep coming back to. Everyone expects it. But one bridged pin and the whole kit is dead.

Still working through this one. Drop your thoughts below — genuinely curious how others approach this. 👇

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