![Choosing USB Pin Voltages for iPhones and iPads « Adafruit Industries – Makers, hackers, artists, designers and engineers! Choosing USB Pin Voltages for iPhones and iPads « Adafruit Industries – Makers, hackers, artists, designers and engineers!](https://cdn-blog.adafruit.com/uploads/2011/07/PT_101296.jpg)
Choosing USB Pin Voltages for iPhones and iPads « Adafruit Industries – Makers, hackers, artists, designers and engineers!
![MakerHawk USB 3.0 Tester, USB Power Meter, 3.7-30V 0-4A Voltage Tester Multimeter, USB Current Meter Tester, IPS Color Display Voltmeter Ammeter, USB Charger Tester AT34 - - Amazon.com MakerHawk USB 3.0 Tester, USB Power Meter, 3.7-30V 0-4A Voltage Tester Multimeter, USB Current Meter Tester, IPS Color Display Voltmeter Ammeter, USB Charger Tester AT34 - - Amazon.com](https://m.media-amazon.com/images/I/6185i8jFTzL.jpg)
MakerHawk USB 3.0 Tester, USB Power Meter, 3.7-30V 0-4A Voltage Tester Multimeter, USB Current Meter Tester, IPS Color Display Voltmeter Ammeter, USB Charger Tester AT34 - - Amazon.com
![What voltage is in a phone micro USB? Is it more than 3.7V so it can power a little amplifier? - Quora What voltage is in a phone micro USB? Is it more than 3.7V so it can power a little amplifier? - Quora](https://qph.cf2.quoracdn.net/main-qimg-19fef2837e95ab822d558f443e134933.webp)
What voltage is in a phone micro USB? Is it more than 3.7V so it can power a little amplifier? - Quora
![USB Voltage Meter with OLED Display : ID 2690 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits USB Voltage Meter with OLED Display : ID 2690 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/2690-08.jpg)