A preamplifier is a circuit or electronic device placed between a source and an amplifier stage and designed to accept weak voltage signals from sources.
The preamplifier is used to amplify the weak signal. Generally, the signal is first filtered through the electrolytic capacitor to filter out the high frequency noise signal, and then enters the negative feedback op amp to amplify the signal. A power amplifier generally refers to amplifying the power of an AC signal, that is, a current and a voltage of an amplifying device in the case where the signal is not distorted. The front is placed close to the detector, the transmission line is short, and the distributed capacitance Cs is reduced, which improves the signal-to-noise ratio. The signal is initially amplified by the preamplifier to reduce the relative influence of external interference. The preamplifier is designed for high input impedance and low output impedance for impedance conversion and matching.
If the technology is single, the pre-level is more precise than the latter, and it is more difficult to do. If you want to add a special power line, you must not use the good line in the post-stage because the post-stage current is large. It should be before level.
The preamplifier is generally connected to the pure final stage power amplifier, the front stage output is connected to the input stage of the rear stage, and the rear stage is connected to the speaker. The preamplifier is an amplifying voltage, and the pure final stage power amplifier is an amplifying current. The preamplifier is a linking device between various audio source devices and a power amplifier. The output signal level of the audio source device is relatively low, and the power amplifier cannot be driven normally. The preamplifier acts as a signal amplifier.
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