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 ...

Fig. 1 depicts the system block diagram of the solar window charger, whereas Fig. 4 shows the tried-and-true circuit diagram. Fig. 1 As stated above, the Li-ion battery charger circuit is built around ...

The diagram above labels the main components of the charger. AC power enters the charger and is converted to DC. The PFC circuit (Power Factor Correction) improves efficiency by ensuring the load ...

A closer look at the wall charger that Apple ships with its iPhone has found that the hardware includes better and safer components than typical chargers. ""Apple's power adapter is clearly a high ...

Zimmerman found that he could build a USB solar charger for under $30 (or $10 if be buys parts in bulk, though it's not likely you'll be buying bulk solar cells and DC-to-USB converter circuits).

Make your next project solar-powered with this charging circuit. It’s completely through-hole, and there are no microcontrollers that need to be flashed. If you can source parts and are handy ...