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An amplifier can be used to adapt the range of a signal to a requirement, to make it more robust for transmission, or to satisfy interface requirements (like input/output impedance).

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Controlling a Piston Variable Pump with a Raspberry Pi

I assume that we'll need some sort of current amplifier which can be controlled by the 5V output's current but powered by the 12V supply. …
Addison Crump's user avatar