DIY

LED flashlight battery holder resistance

I had some broked LED flashlights and I thought of using components from them. Especially the compact battery holder that takes three AAA batteries looks useful in other small projects. Those worked OK when lightly loaded. But when I started taking current for a small motor, I could not get acceptable power out of them.

Useless device kit

A useless machine is a device which has a function but no direct purpose. Typically it is an amusing engineering “hack“, or as an intellectual joke. The most well-known “useless machines” are those inspired by Marvin Minsky‘s design, in which the device’s sole function is to switch itself off by operating its own “off” switch.

Audio over CAT5

Here are some links on transporting audio signals over twisted pair wiring: Digital PreSonus eliminates the snake with a single CAT5 cable #105 – Audinate AVIO Dante Audio Adapter: First Look & Review   Analog #89 – SoundTools CAT Box Snake & SuperCAT CAT5e Review Using Cat5 cable for analog, AES3 and ClearCom signals with

Crimped connectors

Crimp connectors are typically used to terminate stranded wire. A well-engineered and well-executed crimp is designed to be gas-tight, which prevents oxygen and moisture from reaching the metals (which are often different metals) and causing corrosion. Wire crimping is typically a three step process that needs suitable connector and suitable crimping tool: In the first

IoT project links 2019

Internet is full of intetesting IoT projects built using Arduino, Raspberry Pi, ESP8266, ESP32, and many other hardware platforms. I will collect links to intetesting IoT projects to comments. Feel free to post your best IoT project links to comments…

How to Design Your Own Custom Microcontroller Board

This is an interesting tutorial series. With it you’ll learn how to design your own custom microcontroller board. This custom 32-bit microcontroller board example is based on an Arm Cortex-M0 STM32 from ST Microelectronics. Tutorial: How to Design Your Own Custom Microcontroller Board — Part 1 https://predictabledesigns.com/tutorial-how-to-design-your-own-custom-microcontroller-board-video-part1/ Tutorial: How to Design Your Own Custom Microcontroller Board — Part 2

SMD soldering videos

SMD stands for Surface Mount Device and they are components that you solder on the surface of a circuit board.Soldering them is somewhat different from soldering “traditional” through hole mounted components. There are many SMD soldering tutorials, for example How To Do SMD Soldering Using a Soldering Iron and Sparkfun Surface Mount Soldering Tutorials. Youtube