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This is the name given to the amplification of a signal level. It can be expressed as a ratio of the output signal amplitude to the input signal amplitude. For example, Voltage gain:
Gain = Vout / Vin
Gain is normally expressed in dB.
For voltage gain use:
Gain (dB) = 20 log10 Vout/Vin
For current gain use:
Gain (dB) = 20 log10 Iout/Iin
For power gain use:
Gain (dB) = 10 log10 Vout/Vin
This is a device which adjusts the gain of an amplifier. This is normally done by altering the amount of negative feedback in the amplifying system. A Gain Control is not the same as an 'attenuator' or a 'volume' control.