This charger circuit will step up the voltage from 1.5V to 5V DC to reach the cell phone charging requirement. The circuit uses only an AA or AAA 1.5v battery (1V to 2.4V). The charger is composed of ...

2.5V isn’t interesting to you ... Now we’re not entirely sold on this being a constant current charger circuit. The basic circuit is a voltage regulator, after all. Relying on the transistor ...

which integrates all the circuits for a 5V mobile phone charger in an extremely small package measuring only 5-mm square. Using the NXP solution, fewer than 10 external components are needed to ...

Recently I bought a little gizmo called as “USB Charger Doctor” from an online store ... I already designed/published many digital voltmeter/ammeter circuits based on popular 5v/3.3v microcontrollers ...

This is then rectified, and regulated for use as a 5V charger. In this case it powers ... the boost converter that he uses on his improved circuit. This way if the voltage drops due to poor ...

The motor, in turn, feeds into a voltage regulator circuit, providing a continuous 5V charge to which ever USB device you might connect to it. This prompts us to ask a few obvious questions ...

The Candle Charger is described as an "indoor power plant ... good for six hours of USB charging at a steady 2.5 W (500 mA at 5V), which is the equivalent output of most laptop USB ports, and ...

At 4000mAh, you’ll get about 2 full iPhone charges. At 5V/2A, you’ll also get a speedy charge on your iPad, though not as fast as possible. For those focusing on iPad charging, there are ...