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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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Amplifying a small signal from a phototransistor

I am building an amplifier for a phototransistor. It works well under normal lighting conditions. In my application, the light is very dim and barely produce any readable output. …
Ahmad Al-Baghdadi's user avatar