#413 Your PC Soundcard is an Oscilloscope, a Signal Generator, and a Spectrum Analyzer (Arta, REW)

#392 PID with Arduino?

#386 How to measure low Currents for ESP/Arduino? Power Profiler, Otii, µCurrent Gold, Joulescope

#355 Let's try to build a Vacuum Tube Radio

#347 Measuring Mains Voltage, Current, and Power for Home Automation

#340 How good are the ADCs inside Arduinos, ESP8266, and ESP32? And external ADCs (ADS1115)

#334 How to find the right Power Supply for your Project

#321 7 Sensors tested: Measuring Current with Microcontrollers (Arduino, ESP32, ESP8266)

#313 Useful? Cheap Spectrum Analyzer LTDZ 35-4400M

#279 How to debug Arduino Projects (GreatScott's Walkie-Talkie)

#244 QC3.0 Hacking and Tutorial incl. QC2.0 (Mobile Power Supply) Quick charge with Arduino

#240 Time to Say Goodbye to Arduino and Go On to Micropython/ Adafruit Circuitpython?

#219 9 Important Questions about Wireless Modules Answered (for Arduino Makers)

#177 Avoid Surprises: How good are USB cables and how can you test yours?

#76 Making the Invisible Visible: Debugging Fast Signals, ESP I2C Slave, Rotary Encoder Emulator

#72 Making the invisible visible: Tools for debugging and re-engineering electronic designs