1 depicts the system block diagram of the solar window charger, whereas Fig. 4 shows the tried-and-true circuit ... from both USB and AC adapter sources. One great thing about this chip is that it is ...

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 ...

The craftster behind the very popular $3 solar-powered emergency radio is back with a new awesome project: a cheap solar battery charger ... to USB converter circuit. This takes our AA power ...