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“Finally I’ve made a working battery based portable soldering iron. This one can melt solder in under 10 seconds, which is amazing. The soldering iron weighs just above 100 grams, is comfortable to use, it can reach more than …
“As a lifelong analog EE, I have built and used many DC power supplies starting with an LM309 5V regulator in the late 60’s. Then on to uA723s, various 3 terminal linears, and many switchers. At Analogic in the …
“Make your own adjustable voltage solar charger. A solar charger is a charger that employs solar energy to supply electricity to devices or batteries. Solar chargers can charge lead acid or Ni-Cd battery banks up to 48 V and hundreds …
“A $15 game console the size of a business card that plays multiple games via cartridges. The Game-Card is game console with the dimensions of a typical business card (3.5x2”). Unlike most small Arduino game consoles, the Game Card …
“A few years back in high school I worked on building the robot described in the 1979 book “How to Build Your Own Working Robot Pet” by Frank DaCosta. The robot was controlled by an 8085 (an 8-bit microprocessor), and …
“A PID controlled DIY reflow hotplate using an Aluminium PCB to solder SMD components Story : Last time I made a reflow soldering hotplate from a regular clothing iron. And it works pretty great. The only issue is it uses mains …
“The project described here is a pre-driver for brushless motors with a hall sensor. The board incorporates many features like current monitor, fault, speed control, direction control motor start/stop using tactile switches, various function LEDs, 6 PWM LEDs. By …
“HamMessenger is a portable, battery powered device that runs on a microcontroller and interfaces with an inexpensive ham radio to send and receive text messages and provide position updates using the APRS protocol. Messages and position updates sent via HamMessenger …
“A small logic probe for CMOS and TTL circuits. Measures 5 states, detects pulses and can play different tones for the different states. Looking back through some of the stuff I have built over the years I came across a …
“This instructables show how to use MAX30102, XIAO and a tiny display to build a blood oxygen and heart rate meter. This project use Maxim Integrated MAX30102 Biosensor to detect pulse oximeter and heart rate. However, the official sample is …