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USB Power Adapter
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![How to add an external power supply to a USB hub](https://3.bp.blogspot.com/-kRYHG_4FZLw/UuglPMBt_dI/AAAAAAAAb0E/DqgW3Fm03Hk/s1600/powered-usb-schematics.png)
![5V USB Audio Amplifier Circuit Diagram](https://i2.wp.com/theorycircuit.com/wp-content/uploads/2015/12/USB-type.png)
5V USB Audio Amplifier Circuit Diagram
![USB Power Adapter](https://i2.wp.com/www.vwlowen.co.uk/radio/usb/usb-adapter.png)
USB Power Adapter
![Portable USB Charger Circuit - Build Electronic Circuits](https://i2.wp.com/www.build-electronic-circuits.com/wp-content/uploads/2017/01/Portable-USB-Charger-circuit-diagram-values-1024x449.png)
Portable USB Charger Circuit - Build Electronic Circuits
![Portable USB Charger Circuit](https://i2.wp.com/www.build-electronic-circuits.com/wp-content/uploads/2017/01/Portable-USB-Charger-circuit-diagram-values.png)
Portable USB Charger Circuit
![USB Power Bank Adapter - Codrey Electronics](https://i2.wp.com/www.codrey.com/wp-content/uploads/2018/03/USB-Power-Bank-Adapter-Schematic.png)
USB Power Bank Adapter - Codrey Electronics