Marcio Cunha

Technical Articles

Practical articles, in-depth tutorials, and architectural insights on software engineering, AI, and systems.

All categoriesArquiteturaAutomaçãoBackendCarreiraDevOpsEletrônicaEngenhariaFrontendHardwareIANegóciosProdutividadeRedes
EletrônicaHardware•5 min

Old GPU crashing? How to safely perform a reflow

Learn the technical step-by-step process to perform a controlled reflow on BGA solder joints of graphics cards using a hot air station.

RedesHardware•3 min

How to inspect corrupted MQTT packets on IoT brokers

Learn how to inspect payloads and QoS packets in real-time on embedded systems to identify and fix MQTT communication failures.

HardwareAutomação•3 min

How to cool NVMe SSDs with custom fan curves

Learn how to monitor NVMe SSD controller temperatures and write scripts to automatically adjust PWM fans, preventing thermal throttling and crashes.

EletrônicaHardware•4 min

Blown PoE Switch? How to test voltage on the bench

Learn how to perform electrical diagnostics on damaged Power over Ethernet ports using an oscilloscope and multimeter to identify surges and hidden bench failures.

RedesHardware•4 min

How to crimp and test CAT6A cables without packet loss

Learn the professional step-by-step process to crimp and certify CAT6A cables, preventing dreaded crosstalk and ensuring 10 Gigabit links without packet drops.

EletrônicaHardware•4 min

Distorted audio? How to equalize optical and coaxial outputs

Learn how jitter and sampling rate impact SPDIF digital audio interfaces and discover how to eliminate unwanted sound artifacts.

HardwareAutomação•4 min

Noisy server? How to create custom PWM curves with Python

Learn how to tame loud rack servers by creating custom fan curves integrating Python, IPMI, and real-time hard drive temperatures.

RedesHardware•4 min

IP camera offline? How to debug stuck RTSP streams on NVR

Is your IP camera dropping on the NVR? Learn how to diagnose TCP/UDP handshake issues in high-framerate video streams using FFmpeg command-line tools.

EletrônicaHardware•4 min

Weak ATX power supplies? How to measure voltage ripple

Learn how to use an AC-coupled oscilloscope to measure electrical noise and unwanted oscillations on computer power supply 12V rails.

RedesHardware•4 min

Matter failing? How to inspect Thread packets in mesh

Smart home devices dropping offline? Learn how to use IEEE 802.15.4 sniffers and spectrum analyzers to troubleshoot packet loss in Thread and Matter networks.