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Amazon.com: 5pack 9v Battery Clip with 2.1mm X 5.5mm Male DC Plug for Arduino by Corpco : Electronics
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Amazon.com: 9V 2A Power Supply AC Adapter 110-240V AC to DC 9Volt 2Amp Fit for Arduino UNO R3 MEGA 2560 R3, Schwinn Elliptical Exercise Bike Crosley Cruiser Portable Turntable Record Player 5.5x2.1mm
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Amazon.com: ALAMSCN 3.3V 5V MB102 Solderless Breadboard Power Supply Module with 9V Battery Clip Power Cable 2.1x 5.5mm Male DC Jack Plug for Arduino (Pack of 3) : Electronics
![Switching voltage on/off from a 9v battery using a 2n2222A transistor and an arduino - Electrical Engineering Stack Exchange Switching voltage on/off from a 9v battery using a 2n2222A transistor and an arduino - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/7JdU3l.png)
Switching voltage on/off from a 9v battery using a 2n2222A transistor and an arduino - Electrical Engineering Stack Exchange
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