Soundblaster Preamp

The Sound Blaster 16 PCI and Sound Blaster 16 ISA do not have a very sensitive microphone input. This little one transistor amplifier is powered directly from the microphone jack on the sound card and has LOTS of gain. Just put a 100uF bypass capacitor in parallel with the diode to increase gain even more.
Soundblaster Preamp - schematic

Note that sound cards other than those mentioned above might not supply the correct power to run this amplifier.

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