Car tech
Android Car Stereo Buying Guide: 2-DIN Head Units with CarPlay and Android Auto
How to choose a 2-DIN Android head unit: screen, RAM and storage, wired vs wireless CarPlay, and the harness, fascia and CANbus parts you need.
CANbus Decoders Explained: What the Box Does and How to Pick One
What a CANbus decoder does for an aftermarket head unit, which signals it handles, how protocols like Raise and Hiworld work, and how to match one to your car.
Car Radio Wiring Harness Guide: ISO, 16-Pin Android and CANbus Adapters
ISO vs vehicle-specific harnesses, 16-pin Android adapters and CANbus boxes explained, with tips on matching your car and testing before final install.
How to Install an Android Head Unit: Step-by-Step Guide
Fit a 2-DIN Android head unit safely: tools, disconnecting the battery, airbag precautions, wiring the harness, GPS, mic and USB, bench testing and final checks.
Maker electronics
JST Connectors Explained: SH, ZH, PH and XH Sizes and How to Identify Them
JST SH (1.0 mm), ZH (1.5 mm), PH (2.0 mm) and XH (2.54 mm) connectors explained: how to measure pitch, pick a series and use pre-crimped kits.
LED Matrix Panels Buying Guide: WS2812 Matrices vs HUB75 RGB Panels
WS2812 addressable matrices vs HUB75 RGB panels: pixel pitch (P2 to P10), ESP32 and Raspberry Pi drivers, and how to size a 5 V power supply.
Radio & SDR
Test & measure
EMF Meters and Geiger Counters: What K2, ET925, EMF01 and GC-03 Really Measure
What budget EMF meters and Geiger counters really measure, how to read the numbers, and realistic uses for K2-style, ET925, EMF01 and GC-03 devices.
Monoculars and Phone Adapters: What 8x20 and "80x100" Really Mean
How to choose a compact monocular: magnification and lens size, why "80x100" claims mislead, BAK4 prisms, phone adapters and tripods.