18650 LED Driver Module (AP3031 Boost Converter) for Rechargeable Flashlights
Need stable LED brightness from a single 18650 cell? This AP3031 boost LED driver module improves efficiency, protects LEDs, and simplifies flashlight builds.
How to use AP3031KTR-G1 Boost LED Driver: Application and circuit
Technical guide to the AP3031 boost LED driver: how it works, ILED ≈ 200mV/RISET, OV pin behavior (~17.5V), parts selection, and use cases.
How to Build a Rechargeable Flashlight with a 18650 Battery (AP3031 Driver Guide)
A rechargeable flashlight built with a single 18650 lithium-ion battery can be compact, powerful, and practical for everyday use. This battery format is widely used in …
Intel 4‑Wire Fan Specification Explained (25 kHz PWM, Open‑Collector, Real‑World Tests)
Learn the Intel 4‑wire PWM fan specification with real‑world tests. Understand 25 kHz open‑collector control, minimum RPM limits, and why 0% PWM does not always stop legacy fans.
How to Control a 4-Wire PC Fan Using ESP8266 (PWM + RPM Monitoring Guide)
Learn how to control a 4-wire PWM PC fan using an ESP8266 board. This step-by-step guide covers circuit wiring, PWM speed control, and RPM feedback monitoring with MicroPython.
ESP8266/ESP32 DevKit Pinouts: Guide with Usage Hints
This guide covers the pinout diagrams, GPIO functions, and key considerations for both ESP8266 and ESP32 boards.