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Engineer-Written Docs
Real Mixed-Signal Design
Beginner to Advanced

01 — The Problem

A bag of parts isn't an education.

Most electronics kits ship with a bill of materials and a pinout diagram. If something goes wrong, you're on your own. If you want to understand the circuit, you're searching forums at midnight. That's the problem MSD was built to solve.

Other kits
MSD
Bill of materials only
Full design guide
Blurry pinout diagram
Annotated schematic
No design rationale
Every component explained
Forums for support
Engineer who built it

02 — The Documentation

Every component has a reason.

Each MSD kit ships with a full engineering design guide — schematics with annotations, component selection rationale, and signal flow walkthroughs. Not a pinout. An actual design document, written by the engineer who designed the circuit.

design-guides.md

R1 sets Vref via a voltage divider. 10k balances current draw against noise — go lower and you waste power, go higher and the ADC input floats.

Discrete ADC Design Guide

The I²C clock stretching on this sensor means you can't bit-bang the bus — the master has to release SCL and wait for the slave to pull it low.

I²C Playground Design Guide

The op-amp's gain-bandwidth product limits how fast the feedback loop can correct. At unity gain this stage handles 1 MHz — more than enough for audio.

OpAmp Template Design Guide

03 — The Depth

Real circuits. Not toys.

Op-amp stages, ADCs, I²C buses — our kits live in the interesting territory where most learning materials stop short. No Arduino wrappers. No simplified abstractions. The real thing, documented properly.

⊕
Op-Amp Stages
Gain, filtering, active rectification
Analog
⎍
ADC / DAC
Discrete conversion, no black-box ICs
Mixed
⇄
I²C / SPI Buses
Register-level protocol walkthroughs
Digital
◈
STM32 Firmware
Bare-metal C, HAL, peripheral config
MCU

Ready to stop following instructions and start understanding circuits?

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"All in all, this is a fantastic bit of kit which is a pleasure to build where, if desired, will definitely help take you further in your understanding of similar systems. Highly recommended and a joy to spend a few hours with."

A. McCordick

"This was a fun build and there are a lot of good lessons in such a small package. Unlike a lot of kits, the instructions provided are amazing. Lots of history and backgound on top of the step by step assembly steps make this really easy to recommend for any skill level. Packaging was nice and even had some extra care taken so you wouldn't mix up some of the parts.(i.e the tiny blue capacators)"

ChemSciGuy

"The documentation is unlike anything else I've seen. I finally understand why the circuit works, not just how to solder it together."

M. Fischer

Electrical engineering student

"Das Power Meter Board ist ein sehr praktisches Tool für jeden Hobbyelektroniker. Das Löten macht Spass, auch wenn es ein wenig Fingerspitzengefühl erfordert. Das ganze Projekt ist sehr detailliert dokumentiert und die Funktionsweisen werden erklärt. Bei einem Fehler wurde mir sehr schnell und kompetent weitergeholfen - was bei einem Do DOY Kit nicht unwichtig ist."

S. Heim

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STM32 firmware · Op-amp design · Discrete ADC circuits

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