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Most low cost soundcards are equipped with a single channel microphone input containing an amplifier. This eliminates the need for an external amplifier. For some application the Microphone input is sufficient and gives a low voltage phantom power supply (~1 Volts) for the condenser microphone.
If your microphone needs a greater voltage, a phantom power supply may be included in the sound card, it can be purchased or made using batteries.
If none of the above is sufficient, we recommend using a microphone amplifier. Note that a microphone amplifier can be optimized for certain types of microphones. For instance, a phantom power supply voltage can be provided for condenser microphones. Also, the frequency characteristic can be optimized for a maximally flat frequency response and the input impedance may have been optimized for maximum signal-to-noise ratio.
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