Hack Your 16×2 LCD
Nowadays most popular microcontrollers are working on 3.3V but many liquid crystal displays (LCDs) for them are usually on 5V, because they are centered on Hitachi’s de facto standard LCD controller – the HD44780 chip. […]
Mini Solar Garden/Street Light
Here’s another do it yourself project of an automatic mini solar garden/street light. This design belongs to the ‘renewable energy’ category, and is wired around a handful of inexpensive electronic parts. This nifty light circuit […]
Active Heat sink Fan Controller
Active heat sink fan controller presented here is a very simple yet highly useful circuit for automatic control of cooling fans in active heat sink units. The circuit is realized using easy-to-use inexpensive parts and […]
Stand-alone PWM Power Driver
Do you remember the feeling of building your own power electronics projects with a nifty analog chip? Something like DC-AC power inverter based on the SG3525? The SG3525A is a pulse width modulator integrated circuit […]
TL431 & Li-Ion Battery
TL431 is a cheap ‘n’ cheerful yet reliable programmable precision shunt regulator chip available in 3-pin TO-92 package. This monolithic IC voltage reference operates as a low temperature coefficient zener which is programmable from Vref […]
USB OTG Power Guard
As you may well know, you can borrow USB standard 5 volt dc supply from any smartphone equipped with USB on-the-go (USB OTG) port. USB OTG is a hardware (and software) standard that allows you […]
Universal 2S Li-Ion/LiPo Charger Module
This is a simple and 100% safe universal linear charger module for 2S Lithium-Ion (Li-Ion) and Lithium-Polymer (LiPo) batteries with the recommended constant-current/constant-voltage (CC/CV) charging algorithm. Initially charging takes place in the current mode and […]
Little Rescue Light
During an unexpected blackout in particular, a simple light source can be a handy aid. With only two transistors, one photo resistor, and a few other components you can build an automatic emergency light. Here’s […]
Infrared (IR) Adapter for Smartphone – Part 1/2
Nowadays you can use your smartphone as an infrared remote controller handset to control compatible home appliances, a music system for example. Since most of the smartphones available today do not have an infrared sender, […]
Simple Wireless Door Bell
Here’s an interesting circuit of a wireless door bell/buzzer for electronics students and hobbyists. The circuit is a short-range radio-frequency (RF) tone generator realized with the help of a cheap 433MHz RF transmitter & receiver […]