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pi 2 - How to control 12V DC motor with a NPN transistor, a GPIO pin and a 12 V DC power supply - Raspberry Pi Stack Exchange
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Switching 12v magentic lock with NPN PN2222 - #24 by Deva_Rishi - General Electronics - Arduino Forum
High Side Switching - General Electronics - Arduino Forum
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switches - Can i switch npn transistor using 12v - Electrical Engineering Stack Exchange
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12V 24V Adjustable Infrared Proximity Switch Photoelectric Detect Sensor NPN NO | eBay
