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rpi.gpio - I would like to switch on the Raspberry GPIO using an NPN transistor (2n2222) - Raspberry Pi Stack Exchange
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Raspberry Pi GPIO Circuits: Controlling High Powered Components With a Transistor : 3 Steps - Instructables
Noctua PWM Signal Input über GPIO vom Raspberry ansteuern - GPIO · Elektrotechnik - Deutsches Raspberry Pi Forum
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Trying to build a circuit to release the shutter of a DSLR from a raspberry pi - DIY Astronomer - Stargazers Lounge
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