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gpio output voltage drops when connecting relay - Raspberry Pi Forums
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GPIO Electrical Specifications, Raspberry Pi Input and Output Pin Voltage and Current Capability
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![Low Voltage on GPIO Output Pin [solved] - Raspberry Pi Forums](https://i.imgur.com/wG8HOHc.jpg "Low Voltage on GPIO Output Pin [solved] - Raspberry Pi Forums")
Low Voltage on GPIO Output Pin [solved] - Raspberry Pi Forums
Controlling a Solenoid with Raspberry Pi and a Relay - Tutorial Australia
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Raspberry Pi® 4 Model B – Pinout -
