query: Making a mobile battery charger for smart phones
positive_passages.docid: 153381
positive_passages.text: How do I design a 2A or more power supply for my consumer USB devices?
negative_passages.docid: 75147
negative_passages.text: Powering NiChrome wire from battery
negative_passages.docid: 121317
negative_passages.text: Parallel connection of DC DC Converters with different output to charge the battery
negative_passages.docid: 135049
negative_passages.text: Is it safe, or even possible, to draw more power from a USB port than it was designed to provide
negative_passages.docid: 36841
negative_passages.text: Generating high voltage (100V+) from 5V USB supply
negative_passages.docid: 31779
negative_passages.text: Smart Phone's camera socket
negative_passages.docid: 106598
negative_passages.text: Is it safe to connect battery in series with wall adapter?
negative_passages.docid: 67448
negative_passages.text: Can I use a charger with more output amperage than the device needs?
negative_passages.docid: 67111
negative_passages.text: Can I charge and discharge a NiCd/NiMh battery at the same time?
negative_passages.docid: 156300
negative_passages.text: USB data transfer with a separate power source
negative_passages.docid: 32163
negative_passages.text: How does a cell phone charger work?
negative_passages.docid: 152666
negative_passages.text: Coin cell to power a 5mm UV LED?
negative_passages.docid: 95587
negative_passages.text: How can I safely prototype a mains power circuit?
negative_passages.docid: 80449
negative_passages.text: DIY 24v to 5v usb phone charger
negative_passages.docid: 82217
negative_passages.text: Capacitor charging, work done by battery on changing polarity
negative_passages.docid: 6152
negative_passages.text: Automatically switching from 9V battery to DC wall adapter on insertion
negative_passages.docid: 139397
negative_passages.text: Charge controller for Li-ion or Li-Polymer battery