TP4056 18650 Li-Ion Battery Charger, this is for charging four 18650 batteries at once. Circuit can be used for just one module, just create a new PCB.
Rx_3 set to 2K to limit the charge current to 580mA.
Youtube video here of it in action, along with a retrospective heatsink modification:
Gerber and BOM files:
More compact speedometer with OLED display and temperature measurement.
This is the version 2 of the ATtiny85 speedometer. It features an ATmega328p uC that has more memory, pin functionalities, higher frequency and to which you can easily find the needed libraries (the ATmega328p is used on Arduino Uno). A serial-to-USB converter is needed for programming. It has the previous version's batte...
This is the simple solar solar radio battery charger circuit. A solar cell radio used a 3V (or two 1.2V) nickel-cadmium battery or nickel-metal hydride battery in it. The battery can not be removed. Read more : [**Simple solar radio battery charger**](https://www.eleccircuit.com/simple-solar-radio-battery-charger/)
In this project we will build a **Two Stage Lithium Battery charger (CC and CV)** that could be used as to charge Lithium ion or lithium polymer batters. The battery charger circuit is designed for 7.4V lithium battery pack (two 18650 in Series) but the circuit can be easily modified to fit in lower or slightly higher battery Packs like to build 3.7 lithium battery charger or 12v lithium ion batte...