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ESP8266 as a Microcontroller
STM32F103RB in Arduino and beyond
3A Variable bench PSU with digital readout on colour display using ATMEGA8
Simple, Cheap Motor Controller
How to Build Your First RC Plane for Under $100 - Transmitter, Shipping, Battery, Charger, and Hardware Included
Arduino Battery Shield
Switched Mode Dual Variable Power Supply
Super recycled benchtop power supply
Building a DIY Quadcopter: A Complete Beginner's Guide
DPScope SE - the simplest real oscilloscope/logic analyzer on the planet
Using PCF8574 backpacks with LCDs and Arduino
learn about the 555
Semi Conducting - A Guide
THE SIMPLEST FUNCTION GENERATOR BUILT ON A BREADBOARD
Girino - Fast Arduino Oscilloscope
0-40Mhz, Sine wave generator for $25.
WiFi Enabled Arduino - Interfacing with web APIs
Portable Bluetooth Speaker 2x3W Finished !
Professional PCBs almost cheaper than making them at home
Make a microcontroller-based boost converter