• Register
  • Login
  • 157 x Power Supplies

    Browse through a total of 157 power supply circuits. Great collection of power supply and PSU projects: battery chargers, regulators, solar power supplies.

    DC to DC converters   battery chargers   battery indicators   battery monitors   variable power supplies   voltage and power inverters   voltage converters   voltage regulators  

    Balancing Ni-MH Battery Packs There are still a lot of hand-held tools in use with Ni-Cd or Ni-MH batteries. The simple charger has no switch-off criteria, and you need to measure and adjust the charge time, else you will badly overcharge the batteries. Or you need to add some charge electronics. The battery pack life is limited because of overcharging, of...
    XL6009 12V Universal Charger for Laptop/Notebook I recently failed to resist buying a compact power module from eBay for almost nothing! As usual, thereafter I leaped into the inside electronics of the module, and really amazed by the hidden magic power of that little board. Yes, a simple but highly useful dc-dc boost converter block, literally, suitable for unlimited...
    Robot Battery Meter Often, simple robotics projects are powered from a small power bank consists of common dry cells (1.5Vx4=6V) or Lithium-Polymer cells (2S LiPo=7.2V). Ofcourse, the 5V required for the microcontroller and related circuits is derived from this input supply using a low-drop linear fixed voltage regulator like LM1117-5. Here is a...
    TP4056 LiPo Battery Charger For RC Toys Lithium Polymer (LiPo) battery is a type of rechargeable battery that provides high energy storage to weight ratios in an eternal variety of shapes and sizes. LiPo batteries has taken the electric RC gizmos world by storm,especially for Radio-Controlled (RC) toys like electric helicopters, airplanes and boats. Unlike...
    Low-loss Car Battery Charger Low-loss car battery charger presented here can be used for a lead-acid battery with liquid acid, typical size 12V / 50-80Ah. How it works The basic charge is performed by a transformer and rectifier without any control through transistors or thyristors. You can accept any current from ca 4 to 6 A. The direct charge is very...
    Low Dropout Adjustable Breadboard Power Supply This project details the design of a very low dropout adjustable power supply. A good power supply is essential to electronic projects. While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby designs. Low dropout, only 40mV – 400mV compared to 1.25V –...
    Enhanced Voltage Doubler Power Supplies While most readers are knowledgeable about voltage doublers, here is a discussion about how to use them in unusual ways to enhance power supply circuits that might be otherwise limited in features. Many neat things can be accomplished via the addition of diodes and capacitors. Some of these circuits may be new to the world....
    3.7V Li-Ion Battery Charger Circuit Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is one microchip MCP73831, available in SOT-23-5 package. MCP73831 is a highly advanced linear charge management controller...
    Synchronous MOSFET Rectifier for Reverse Battery Protection When powering a battery operated circuit, the experimenter must make a decision: either take his chances (Murphy loves this one), or opt to add protection in the form of a simple series diode. Unfortunately, as the voltages keep get lower and lower (e.g. 1.2V), a series diode ceases to be a valid option. The solution of choice...
    High Power Car Voltage Regulator While traveling recently, my family had trouble powering the 5 smartphones, 2 tablets, and 2 laptops while driving 2500mi through the southwest. Route 66 and the Grand Canyon are pretty, but in between there are whole lot of straight highways that are not as scenic. This regulator, with the addition of some USB connectors...