What is the difference between Pre-Amplifier and Voltage amplifier?

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Preamplifier conditions a signal to a level from a microvolt or millivolt level before the signal can be fed to a Voltage amplifier stage. In instrumentation systems, pre-amplifier stage preceeds an amplifier stage.

A preamplifier (preamp) is an electronic amplifier that prepares a small electrical signal for further amplification or processing. A preamplifier is often placed close to the sensor to reduce the effects of noise and interference. It is used to boost the signal strength to drive the cable to the ma